Miramar Automotive & Transmission
“I also do appreciate the online report with pictures, makes it easy to refer back to any issues with the car.”
Best Coolant & Radiator Flush near San Marcos, CA
1 of these mechanics is based in San Marcos; the others serve San Marcos from San Diego (21 mi).
2 open weekends · all 10 rated 4.5+
Data verified October 16, 2026
Japanese Car Masters
“When I caught a small detail they missed, they were happy to make it right and gave no pushback.”
1 Way Auto Clinic
“Chris talked me through the whole process, sent photos with explanations, and got the replacement part I needed sent to him within 24 hours.”
FTS Auto
“They do very good work, are always honest about the work, and actually back up the warranties on their work.”
Motec Auto Care
“I was helped by Adolfo and he was very helpful removed a part I needed off my car in 15 minutes I will be coming back”
Jaguar Coventry Cars
“Great staff - Trace, Bill and the rest really know their stuff!”
Listed for drivers in and around San Marcos, CA, these 10 shops list coolant flushes and antifreeze service. What each one says about the coolant types it stocks, machine flushes and warranties comes from its own website; ratings and quotes come from public reviews.
Area overview: San Marcos, CA
The 10 mechanics on this page are rated from 4.7 to 4.9 across 1,919 reviews; all 10 have 50 or more reviews. When customers rate these mechanics on specific qualities, they most often praise professionalism (91%), quality (83%) and punctuality (70%). The topics that come up most in reviews of the mechanics on this page are "diagnosis", "price" and "communication". 2 are open on Saturdays. 5 list staff certifications (ASE) and all 10 have a BBB rating of A or A+. Domain records put 8 websites of the mechanics on this page at ten or more years old; the oldest dates from 2000. 2 offer financing; 2 give free estimates; 5 are family- or locally-owned and 5 list coupons or special offers. We have a website on file for all 10 of the mechanics on this page; 9 publish a contact page; 6 list a public email and 3 take bookings online. We count these figures across the mechanics on this page; distances are straight-line, and hours and prices change, so confirm the details with the mechanic before you visit.
Can I book a coolant change online with shops listed for San Marcos?
Online booking is offered by 3 of the 10 shops. Put your engine and the coolant specification in the notes when you book, since the shop needs the right fluid on the shelf before you arrive rather than a universal jug under the counter.
Transmasters Auto Care
“Sam was such a great guy, The price is reasonable, did a great job on my car.”
Pacific Auto Service
“Very knowledgeable and are like family”
The Truck Shop: Toyota/Lexus/Scion
“They will go above and beyond to make sure you and your car are happy.”
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Centric Auto Repair
“I would recommend this shop and will use them again in the future.”
Why these companies made our list
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