Lupe's Auto
“Eric did an amazing job in communicating and explaining every spec and detail of what was going on with my car.”
Best Radiator Repair in Ontario, CA
20 technicians listed · all 20 in Ontario · 15 open weekends · 19 rated 4.5+
Data verified October 16, 2026
Wayne's Automotive
“Always a pleasure to take my car there when I have to.”
Brian's Automotive Repair
“Everyone I encountered from the owner to the technicians were very polite.”
Tap Automotive
“Martin the mechanic was very helpful and gave me the best advice on my car problem.”
C & C Automotive
“I highly recommend coming to C&C automotive I've been coming for a couple years now, they do great business and Carlos is a great guy 🙌🏼 -Andrew …”
A-1 Radiator & Air Conditioning
“I want to express my appreciation for the prompt and professional radiator service I received from A-1 Radiator & AC.”
Listed for drivers in and around Ontario, CA, these 20 shops repair and replace radiators and cooling system parts. What each one says about recoring, warranties and truck work comes from its own website; ratings and quotes come from public reviews.
Area overview: Ontario, CA
All 20 technicians we list here are in Ontario itself. We have 21 technicians in Ontario on file; this page shows the highest-rated 20. The technicians on this page are rated from 4.3 to 5.0 across 1,278 reviews; 6 have 50 or more reviews and 19 are rated 4.5 or higher. The topics that come up most in reviews of the technicians on this page are "price", "communication" and "honest". 15 are open on Saturdays. 8 have a BBB rating of A or A+. 12 have ten or more years of experience, the longest 75 years. 1 lists coupons or special offers. We have a website on file for 7 of the technicians on this page; 2 publish a contact page and 2 take bookings online. We count these figures across the technicians on this page; hours and prices change, so confirm the details with the technician before you visit.
Which radiator shops listed for Ontario open on Saturdays or Sundays?
15 of the 20 shops on this page open on weekends. Overheating does not wait for Monday, so if nobody is open, the safe move is still the same: leave the car parked and have it towed rather than drive it hot.
Menas Brake & Suspension
“I have been a client at this shop for over 20 Years the are reliable and trustworthy, I have recommended this place to friends and family and they are real happy with the services and affordable prices !!”
DT Hondamotive and Transmission
“They were honest, transparent and didn't even charge me for the diagnosis!”
Tune-Ups Inc
“He replaced the motor in my 2012 impresa no hiccups fast service.”
Baja Auto Center Smog & Lamp
“Tony was very kind and transparent in what needed to be done on my car and how to go about it.”
Motorinn Genuine Auto Care LLC
“Cesar and Cirilo (I think is his name) come off as honest people who I can trust with my car or any questions I have.”
Ontario Japan Auto
“I will be coming back for all of my maintenance needs since I plan to keep this legendary Japanese masterpiece forever.”
I.E Automotive
“Me and my wife love how the owner is very hands on and extremely professional with our cars.”
RC Auto Repair
“I have had multiple vehicles repaired and worked on and have never had to return for the same issues.”
Pomona Auto Care
“If your car needs repair this is the best place to repair it!!!”
Henry's Radiator Services
“Henry ended up getting me a brand new radiator for half the price within hours”
Norman's Auto Repair
“Only place I'll be going for car maintenance.”
Mobil Auto Service
“Stopped in to get my brakes done and oil change amazing prices great customer service very professional”
M.d.o. Auto Repair & Towing
P & F Complete Auto Repair
Why these companies made our list
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