Welcome to On Site Auto Repair!
Auto Repair in Windsor, CA
In Windsor, CA, we provide brake repair, oil changes, check‑engine diagnostics, transmission service, tire rotation and alignment, AC repair, battery replacement, suspension and steering work, and smog checks for cars and light trucks.
Visit our Windsor, CA location today for top-notch auto repair services tailored to your vehicle's needs!
Our Auto Repair Services in Windsor, CA
Brake Repair Windsor, CA
Need Brake Repair in Windsor, CA? Stop safely on Old Redwood Highway, Shiloh Road, and wet West County backroads with precise pad and shoe replacement, rotor resurfacing or replacement, drum repair, brake fluid exchange, caliper and wheel cylinder service, and ABS diagnostics. We inspect squeaks, pedal pulsation, soft pedal feel, and dashboard brake lights, then show you measurements and parts wear before work begins. Get free inspections and many same‑day fixes so you can commute to Santa Rosa without delay. Book Brake Repair in Windsor, CA today and keep your Toyota, Honda, Ford, Chevy, or Dodge stopping straight daily.
Radiator Repair Windsor, CA
Overheating on US‑101 near Windsor Green or climbing Chalk Hill Road? Choose Radiator Repair in Windsor, CA that tackles summer heat, vineyard dust blocking fins, and stop‑and‑go near Airport Boulevard. Our technicians diagnose coolant leaks, pressure‑test the system, verify water‑pump circulation, and confirm thermostat operation to keep engine temps stable. We repair or replace radiators, hoses, belts, and perform coolant flushes for Toyota, Honda, Ford, Chevy, Subaru. Get help before Sonoma County heavy traffic turns a small leak into engine damage. Book Radiator Repair in Windsor, CA today. For preventive maintenance or emergencies, choose Radiator Repair in Windsor, CA.
Check Engine Light Repair Windsor, CA
Get precise Check Engine Light Repair in Windsor, CA before a Highway 101 commute. We read manufacturer codes, smoke-test EVAP leaks, verify O2 sensors and catalytic converters, and confirm fixes with readiness monitors so you can pass Sonoma County smog. We solve misfires, rough idle, loose gas caps, and wiring faults triggered by vineyard backroad potholes and heat. Local insight: Windsor traffic, Old Redwood Highway stops, cold-morning starts. Book Check Engine Light Repair in Windsor, CA to restore power, mileage, and reliability with testing. Choose Check Engine Light Repair in Windsor, CA that delivers results and prevents repeat warnings.
Auto AC Repair Windsor, CA
Choose local Auto AC Repair in Windsor, CA to beat heat on Old Redwood Highway and clear foggy commutes along 101. EPA 609-certified technicians diagnose weak airflow, warm vents, mildew smells, and mystery leaks with computer scanning and pressure testing. We service Toyota, Honda, Ford, Chevy, Subaru, Lexus, Hyundai, and more. Get R-134a or R-1234yf recharge, compressor and condenser repair, evaporator and heater core replacement, blend door fixes, thermostat service, and climate control calibration. Expect rapid defrost for vineyard backroads and wildfire-smoke seasons. Book Auto AC Repair in Windsor, CA and restore cold air, reliable heat, and odor-free operation.
Oil Change Windsor, CA
Choose Oil Change in Windsor, CA to handle Sonoma County driving conditions. Stop‑and‑go on 101, Town Green errands, vineyard dust, and summer heat thin oil and clog filters. We use the OEM‑specified viscosity, replace filters, reset maintenance lights, and document service to help keep warranties valid. Protect turbocharged and high‑mileage engines, reduce fuel dilution from short trips, and quiet cold‑start knock on foggy mornings. Get quick turnarounds near Old Redwood Highway with responsible used‑oil recycling. Ask for tire rotation and fluid top‑offs during the same visit. Book online now: Oil Change in Windsor, CA that fits local needs today.
Suspension Repair Windsor, CA
Need Suspension Repair in Windsor, CA? Potholes on Old Redwood Highway, speed humps near Town Green, and Highway 101 stretches can knock alignment, blow struts, and loosen ball joints. We diagnose clunks, nose-diving brakes, uneven tire wear, and steering pull, then replace shocks/struts, control arms, tie rods, sway bar links, and bushings, followed by precise four-wheel alignment. We service trucks from vineyard roads, Subarus, Toyotas, and work vans. Same-day parts from Santa Rosa suppliers cut downtime. Book Suspension Repair in Windsor, CA to restore stability, improve braking, and smooth Chalk Hill and Windsor River Road—Suspension Repair in Windsor, CA.
Tire Shop Windsor, CA
Tire Shop in Windsor, CA solves driving issues: Highway 101 debris, nails from construction near Old Redwood Highway, and potholes that knock wheels out of balance. Get precise mounting to factory torque, new valve stems, computer balancing to stop steering shake, puncture repairs, and TPMS diagnosis after cold morning pressure drops. Choose Michelin, Bridgestone, Goodyear, or Continental sized for your Toyota, Honda, Subaru, Ford, and more. Need a quick flat fix before a Windsor Town Green commute? Visit Tire Shop in Windsor, CA. Local technicians align services to Sonoma County roads, making a Tire Shop in Windsor, CA practical.
Transmission Repair Windsor, CA
Need dependable Transmission Repair in Windsor, CA? Local technicians diagnose slipping, harsh shifts, leaks, and clutch chatter caused by Highway 101 stop‑and‑go, Old Redwood Highway traffic, vineyard grades, and summer heat. We service automatic and manual gearboxes, perform fluid exchanges, filter replacements, clutch and flywheel work, axle and CV repairs, transfer case service, and complete rebuilds. Advanced scan tools and pressure tests pinpoint faults fast, saving unnecessary towing to Santa Rosa. Convenient to Shiloh Road, we offer estimates and same‑day maintenance. Schedule Transmission Repair in Windsor, CA and keep shifts smooth on Windsor River Road and Healdsburg commutes daily.
Trusted Auto Repair and Maintenance in Windsor, CA
On Site Auto Repair in Windsor, CA provides mobile auto repair and maintenance at your home or workplace. Services include diagnostics with OBD-II scanning, brake pad and rotor replacement, battery testing and replacement, starter and alternator service, belt and hose replacement, fluid leaks, oil changes, coolant system service, spark plugs and ignition coils, radiator and water pump replacement, suspension inspections, and check engine light troubleshooting. We service most makes and models in Windsor and nearby areas, offering clear estimates and convenient scheduling.
About Windsor, CA
Windsor, CA blends small-town planning with wine-country proximity, shaped by rail-era roots and a redeveloped Town Green. Residents value walkable neighborhoods, weekly markets, and active parks; businesses benefit from steady foot traffic and local events. Notable landmarks include Windsor Town Green, Windsor Regional Library, Keiser Park, Sonoma County Fire District HQ, and Windsor High School campus. Technicians navigate Windsor’s neighborhoods and landmarks—Old Downtown, Windsor Town Green, and business parks off Shiloh Road—to deliver mobile diagnostics, brakes, batteries, and cooling system repairs on-site. Service vans arrive with OEM-grade scanners and parts, minimizing tow needs. Appointments are scheduled around school pickups and commute times on Old Redwood Highway and 101 access points for minimal disruption.
Windsor's population is 26,344. City center coordinates: 38.5465, -122.8167. Summers are hot and dry with inland heat spikes; winters are mild with cool, wet storms and occasional fog. On Site Auto Repair uses high-temperature-rated fluids, battery checks before heat waves, and corrosion prevention after winter rains, while following California BAR licensing, CARB parts rules, and proper hazardous waste handling. In Vintage Greens, we handle brake and battery issues onsite near parks. Lakewood Hills sees scheduled maintenance and diagnostics at gated homes. Vintana residents get mobile AC and tire repairs. Foothill Regional Park area benefits from roadside engine troubleshooting and quick fluid services. We use recycled materials and sustainable methods whenever possible, reducing waste and energy use. Our team supports Windsor’s community through local partnerships and events. For reliable Auto Repair services in Windsor, contact On Site Auto Repair today.
Cities We Serve
Neighborhoods We Serve
Things to Do
Windsor Town Green
Foothill Regional Park
Shiloh Ranch Regional Park
Pacific Coast Air Museum
La Crema Estate at Saralee's Vineyard
Safari West
Charles M. Schulz Museum and Research Center
Keiser Park
Martinelli Vineyards & Winery
Sonoma-Cutrer Vineyards
Riverfront Regional Park
Gamba Vineyards & Winery
Calluna Vineyards
Kendall-Jackson Wine Estate & Gardens
Notre Vue Estate Winery & Vineyards
Mutt Lynch Winery
Lakewood Meadows Park
Windsor Bowling Center
Race 60 Escape Rooms
Transportation
Windsor Rd & Windsor Depot
Old Redwood Hwy & Windsor River Rd
Windsor River Rd & Starr Rd
Windsor Rd & Reiman Ln
Old Redwood Hwy & Alden Ln
Windsor River Rd (Windsor Depot)
Hembree Ln & Old Redwood Hwy
Los Amigos Rd & Tabatha Way
Copperhill Pkwy & N Laughlin Rd
Windsor River Rd & Old Redwood Hwy
Airport Blvd & SMART Station
Old Redwood Hwy & Windsor Rd
Sonoma Country Airport
Windsor River Rd & Spencer St
Windsor Rd & Howard Dr
Old Redwood Hwy & Windsor Rd
Starr Rd & Gumview Rd
Old Redwood Hwy & Lakewood Dr
Raley's Shopping Center
Hembree Ln & Broad Oak Way
Driving Directions
Driving Directions from Ryan's Automotive - Auto Repair, Oil Change, Brake Repair, Tire & Alignment Service in Windsor CA to On Site Auto Repair
Driving Directions from Windsor Truck & Auto Service to On Site Auto Repair
Driving Directions from Drive Rite Automotive to On Site Auto Repair
Driving Directions from AAA Windsor Auto & Tire Center to On Site Auto Repair
Driving Directions from Windsor Auto Repair to On Site Auto Repair
Driving Directions from G & C Auto Body, Inc. to On Site Auto Repair
Driving Directions from Bernhardt's Custom Rides to On Site Auto Repair
Driving Directions from Wayne & Sons Automotive Repair, LLC to On Site Auto Repair
Driving Directions from Smog Check Windsor to On Site Auto Repair
Driving Directions from Christian Brothers Automotive Windsor to On Site Auto Repair
Driving Directions from Bonanno Automotive to On Site Auto Repair
Driving Directions from Pike's Auto Care Center to On Site Auto Repair
Driving Directions from A A Smog Test Only of Windsor to On Site Auto Repair
Driving Directions from Best Truck Body And Trailer Repair to On Site Auto Repair
Driving Directions from North Bay Bavarian to On Site Auto Repair
Driving Directions from ABC Auto Repair to On Site Auto Repair
Driving Directions from EAS Tire & Auto to On Site Auto Repair
Driving Directions from Les Schwab Tire Center to On Site Auto Repair
Driving Directions from Heritage Truck and Off-Road to On Site Auto Repair
Driving Directions from Wine Country Automotive to On Site Auto Repair
Frequently Asked Questions
Our certified mechanics answer the most common car repair questions to help you stay informed and confident. Explore our FAQs for honest, expert advice trusted by Santa Rosa drivers.
Do you provide loaner cars or shuttle service?
While we don't provide loaners, we're located in downtown Santa Rosa's Railroad Square with easy access to shopping, dining, and public transportation while you wait.
Can you work on my vehicle if it's still under warranty?
Absolutely! We perform warranty-compliant maintenance and repairs. We use OEM or equivalent parts to maintain your vehicle's warranty coverage.
How do I know if I really need the recommended service?
We provide detailed explanations and show you exactly what needs attention. We never pressure you into unnecessary repairs - our reputation depends on honest service.
Do you offer payment plans for major repairs?
We accept cash, check, and all major credit cards. For major repairs, we can discuss payment options that work for your budget.
What if my car breaks down outside of business hours?
Call our main number (707) 326-8655 and leave a message. We'll get back to you first thing in the morning to arrange service.
ReviewsWhat Our Clients Say
Brands We ServiceAuto Repair Brand
Toyota Repair
Honda Repair
Ford Repair
Chevrolet Repair
Nissan Repair
Mercedes Repair
Lexus Repair
Acura Repair
Infiniti Repair
Kia Repair
Hyundai Repair
Subaru Repair
Mazda Repair
Volkswagen Repair
Contact Info
Location
363 W 9th St B & C
Santa Rosa, CA 95401
Phone
707-326-8655
Hours
- Monday-Thursday: 7:30 AM - 4:30 PM
- Friday: 7:30 AM - 12:00 PM
- Saturday: Closed
- Sunday: Closed
New Customer Special:
$25 off your first service over $100. New customers only. One per household. Mention this offer when you call. Valid through December 31, 2026.
Oil Change Special:
Full synthetic oil change for $69.99. Includes up to 5 quarts of oil and a new oil filter. Most cars and light trucks. Valid through December 31, 2026.
Free Brake Inspection
Free brake inspection. We check pads, rotors, fluid, and lines and give you a written report. No purchase required.
Latest News
Why Is My Coolant Light On in Sebastopol? What Low Coolant Actually Means for Your Engine
If your coolant warning light just came on near Sebastopol or anywhere in Sonoma County, don’t ignore it — low coolant can lead to serious engine damage fast. This guide explains what that light actually means, what causes coolant loss, and when you need to get it checked before a small problem becomes a very expensive one.
Why Are My Shocks and Struts Worn Out Already? What Healdsburg and Sonoma County Drivers Need to Know
If your ride feels bouncier than usual, or your car nose-dives when you brake, your shocks and struts might be telling you something. Here’s how to recognize the warning signs, why Sonoma County roads accelerate wear, and what to expect when you bring your vehicle in for suspension service.
How Do You Know When Your Car Battery Is Dying in Windsor or Santa Rosa? Signs, Tests, and What to Do
A dying car battery doesn’t always announce itself with a dramatic no-start. Learn the early warning signs Santa Rosa and Windsor drivers should watch for, what a proper battery test involves, and when it’s time to replace — before you’re stranded.
How Often Should You Change Your Transmission Fluid in Rohnert Park? Here’s What You Need to Know
Transmission fluid doesn’t get talked about as much as oil changes, but skipping it is one of the most expensive mistakes a driver can make. If you’re in Rohnert Park or anywhere in Sonoma County, here’s what you actually need to know about transmission fluid intervals, warning signs, and what happens when you wait too long.
Why Is My Car Shaking When I Drive? Steering and Suspension Warning Signs in Santa Rosa
If your car shakes, pulls to one side, or feels like it’s bouncing over every little bump, your steering or suspension is trying to tell you something. Here’s what those symptoms actually mean for Santa Rosa drivers — and when to get it looked at before a small problem becomes an expensive one.
Why Is My Car’s AC Blowing Warm Air in Petaluma? What’s Going On and How to Fix It
If your car’s AC is blowing warm air this summer, you’re not imagining it — and you’re definitely not alone in Petaluma or anywhere across Sonoma County. This article breaks down the most common reasons your AC stops cooling, what the warning signs mean, and when it’s time to bring it in for a proper diagnosis.
Why Is My Check Engine Light On in Santa Rosa? What It Actually Means and What to Do Next
That little amber light on your dashboard can mean anything from a loose gas cap to a failing catalytic converter — and most Santa Rosa drivers have no idea which one they’re dealing with. Here’s what the check engine light actually means, when it’s safe to keep driving, and when you need to pull over and call a shop right away.
Why Are My Brakes Squealing in Santa Rosa? What It Means and When to Get It Fixed
That high-pitched squeal when you hit the brakes is your car trying to tell you something — and in Santa Rosa, where hilly neighborhoods and long Highway 101 commutes put real strain on your braking system, it’s worth listening. This guide breaks down exactly what brake noise means, when it’s urgent, and what you can expect from an honest brake inspection.
Why Is My Car Overheating in Petaluma? What to Do and When to Get It Checked
If your temperature gauge is climbing or you’re seeing steam from under the hood around Petaluma or anywhere in Sonoma County, don’t ignore it. Overheating is one of the fastest ways to turn a minor repair into a major engine problem — here’s what’s actually happening, what to do in the moment, and when to bring it in.
Essential Hyundai maintenance tips for long-lasting performance
With regular maintenance, you can ensure that your Toyota performs at its best in the beautiful surroundings of Santa Rosa, CA. This guide offers imperative tips tailored to the unique driving conditions and climate in the area, helping you keep your vehicle in top...
Read More About Our Auto Mechanic Services
On Site Auto Repair in Santa Rosa is a full service auto mechanic shop. Our auto mechanics are certified and are here to help with all of your repair needs. No auto repair job is too big or too small for On Site Auto Repair. We handle all types of auto repair, including regular maintenance, engine repair, brake work, and troubleshooting. If you are looking for honest and reliable auto mechanics, give us a call today. Ask us about our new customer specials.
Vehicles are usually described as 5 speed or 6 speed, meaning they have that many gear ratios. Those gears let the vehicle travel across the full range of speeds and use the engine's power efficiently. Transmissions are complex and are in constant use, so they take a lot of wear and tear. Many owners also forget to check and change the fluid on a regular schedule. That is why transmission problems are so common. At On Site Auto Repair in Santa Rosa, our transmission technicians can diagnose, repair, or replace your transmission. If you are looking for an honest transmission repair shop, give us a call today.
There are several warning signs that your vehicle can give you before your brakes may reach the point of potential failure or extensive repair. Whether composed of ceramic, semi-metallic, or organic materials, brake pads erode each time you depress the brake pedal. If the pads wear down too much without being replaced, the metal housing for the pads will make contact with the metal rotors (or drums), which may produce not only a safety issue but a situation where the rotors/drums are required to be replaced as a result of the prolonged contact of metal parts without the pad buffer. If you are in need of an affordable brake repair mechanic in Santa Rosa, please do not hesitate to schedule an appointment today!
Vehicle Inspection In Santa Rosa
The key to top notch automotive repair and troubleshooting lies in a thorough understanding of what’s actually going on under the hood. Sure, you know that a radiator keeps your engine cool, but understanding how it keeps it cool is the key to solving technical problems efficiently. If you know which parts perform what function, your powers of diagnosis will be much more powerful.
Radiator Inspection Service In Santa Rosa
Ensuring that your vehicle’s engine cooling system is in proper operating condition is extremely essential to engine life and performance. Operating at excessive temperatures can lead to premature engine wear. Your vehicle’s engine cooling system should be checked periodically, and a radiator coolant flush is also recommended to prohibit radiator corrosion. On Site Auto Repair will thoroughly drain and power flush the old coolant and particulates, and refill the cooling system with your vehicle manufacturer’s recommended coolant.
Our Santa Rosa Service Area – Directions to On Site Auto
Proudly serving drivers throughout Santa Rosa neighborhoods, from Railroad Square to Bennett Valley, and extending our trusted auto repair services to Petaluma, Sebastopol, Windsor, and all of Sonoma County.
Auto Repair Services We Offer in Santa Rosa, CA
Our shop at 363 W 9th St B & C handles a wide range of repairs and maintenance for drivers across Santa Rosa and Sonoma County.
Engine Diagnostics and Check Engine Light
A check engine light means your car is reporting a fault. We connect an OBD-II scanner, read the fault codes, and explain what they mean in plain language. We diagnose the problem first, then tell you what the repair will cost.
Oil Change Service
We do full-synthetic and conventional oil changes. We use the viscosity grade your manufacturer specifies, such as 5W-30, 5W-20, or 0W-20, and we replace the oil filter every time.
Brake Repair and Replacement
Worn brake pads squeak. Worn rotors grind. A soft brake pedal is a warning. We inspect and replace brake pads, rotors, and calipers using OEM-quality and aftermarket parts, depending on your budget.
Battery, Alternator, and Starter Repair
We test your battery with a load tester, not just a voltage check. We also test the alternator and starter, because a failing alternator will kill a new battery quickly.
AC and Heating Repair
If your AC is not blowing cold, we recharge the refrigerant and check for leaks. If your heat is not working, we diagnose the cause and repair it.
Scheduled Maintenance and Tune-Ups
We handle spark plug replacement, belt inspection and replacement, air and cabin filter replacement, fuel system service, coolant flushes, and transmission fluid service. If you are not sure what your car is due for, we look it up by make, model, and mileage.
Tire Rotation and Inspection
Uneven tire wear affects handling, fuel economy, and tire life. We rotate your tires, measure tread depth, inspect the sidewalls, and check the pressure.
Pre-Purchase Inspection
Thinking about buying a used car? We check the brakes, belts, fluids, undercarriage, and suspension, and we run a diagnostic scan for hidden fault codes. Call for current pricing.
Why Santa Rosa Drivers Choose On Site Auto Repair
Free estimates. You know the cost before we start any work.
Same-day appointments available. Call and we will tell you what we can fit in today.
ASE Certified mechanics. Credentialed professionals with real diagnostic tools.
Convenient location. We are in Railroad Square, minutes from downtown Santa Rosa, with shops and restaurants in walking distance while you wait.
Ready to Book?
Call (707) 326-8655 or send us a message with your vehicle and what is going on with it. We will give you a free estimate before we schedule anything.
On Site Auto Repair — 363 W 9th St B & C, Santa Rosa, CA 95401. Serving Santa Rosa, Petaluma, Rohnert Park, Sebastopol, Windsor, Healdsburg, and Sonoma County.
Things To Do In Santa Rosa, CA
From exploring the Charles M. Schulz Museum and Luther Burbank Home & Gardens to enjoying outdoor adventures at Spring Lake Regional Park and Annadel State Park, Santa Rosa offers endless opportunities for family fun, Wine Country experiences, and recreational activities that keep our community vibrant year-round.
Santa Rosa Transportation to On-Site Auto Repair
Conveniently located in the historic Railroad Square district with easy access from Highway 101, our auto repair shop is just minutes from downtown Santa Rosa, Santa Rosa Plaza, and all major neighborhoods, with nearby public transit options and walkable access to local shops and restaurants while your vehicle is being serviced.
Contact On-Site Auto Repair Today
Ready to experience honest, reliable auto repair in Santa Rosa?
Whether you’re dealing with a check engine light, need routine maintenance, or facing an unexpected breakdown, our ASE-certified mechanics are here to help. We serve drivers throughout Santa Rosa and Sonoma County with the same commitment to quality and honesty that has made us the area’s most trusted auto repair shop.