Reliable Smog Saint Anthony Complete Auto Care
“Albert and he rebuilt her transmission and fixed 'all' the safety measures around her jeep to keep her and my grandson safe.”
Best Radiator Repair in Rancho Cucamonga, CA
15 technicians listed · 11 in Rancho Cucamonga · 6 open weekends · 12 rated 4.5+ · 2 show a license
Data verified October 16, 2026
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Upland Mercedes Repair
“I set up an appointment and was given great service and a great deal!”
Motorcooling Radiator & Truck Parts
“Awsome staff helped right away and probably the best prices around the 909,thank you motor cooling!!!”
Al & Son's Automotive
“Roger is a nice person who helped me and my family with car issues, while we were waiting for our car to be done being worked on he was really friendly and explained what certain parts of the car do.”
Allstar Auto Center
“The people who work there are so friendly and they diagnosed my car quickly.”
Toyotek
“He fixed it right away and checked out other issues such as removing a rag which had somehow found its way into the engine and was affecting the airflow from the air conditioner!”
Listed for drivers in and around Rancho Cucamonga, CA, these 15 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: Rancho Cucamonga, CA
Of the 15 technicians we list here, 11 are in Rancho Cucamonga itself and 4 come from Upland (2, 5 mi), Ontario (1, 6 mi) and Chino (1, 11 mi). The technicians on this page are rated from 4.2 to 5.0 across 1,698 reviews; 10 have 50 or more reviews and 12 are rated 4.5 or higher. The topics that come up most in reviews of the technicians on this page are "price" and "honest". 6 are open on Saturdays. 2 show a license on their websites; 2 list staff certifications (ASE) and 5 have a BBB rating of A or A+. 11 have ten or more years of experience, the longest 41 years. 3 are family- or locally-owned and 2 list coupons or special offers. We have a website on file for 9 of the technicians on this page; 6 publish a contact page; 4 list a public email and 4 take bookings online. We count these figures across the technicians on this page; distances are straight-line, and hours and prices change, so confirm the details with the technician before you visit.
Which radiator shops listed for Rancho Cucamonga open on Saturdays or Sundays?
6 of the 15 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.
JR Auto Care
“Explained the issues and allowed us to go into the shop to see what the problem was.”
Rocket Garage
“Spoke to the mechanic, and they assured me, they would look at it and give me an estimate.”
Japanese Auto Care Specialist
“Ray was confident that it was just a sensor issue and I brought it to him and he diagnosed it and repaired it and it was even lower than what he quoted me at first!”
Unibuilt All Automotive Repair
“Had my whole engine an transmission overhaul here made everything look oem, grate service and good prices.”
Alta Loma Radiator
Alonso's Auto Repair
“I've been a customer for a year and a half and Alonso's is a shop I trust to repair and maintain my vehicles.”
Lupe's Auto
“Eric did an amazing job in communicating and explaining every spec and detail of what was going on with my car.”
McBride's RV Service & Paint
“This family-owned company has Integrity, ethics, fair pricing, and all of its mechanics are certified”
Al & Lee's Auto Care Center
“Honest car repair with respectable outcomes.”
Why these companies made our list
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