RX Automotive
“RX Automotive is always my first choice for expert quality car care.”
Best Coolant & Radiator Flush in St. Charles, IL
15 mechanics listed · 4 in St. Charles · 5 open weekends · 13 rated 4.5+
Data verified October 16, 2026
Excel Automotive Repair
“Excel diagnosed the problem quickly gave us an amazing deal, and did the repairs in a timely manner.”
North Fifth Auto Repair
“I came in for an oil and brake change and he helped me with my loose bumper by temporarily zip tying for me until I'm ready to buy the replacement part.”
Action Auto Clinic
“Got my wife's car to pass emissions for about a third of what I was expecting to spend.”
Dave's Auto & Radiator Repair
“Come here all the time, best price for storing my vehicles and decent labor hours, can't beat that, good place”
McLean Auto Repair
“Made an Appointment and the work was done in the time specified in the estimate.”
Listed for drivers in and around St. Charles, IL, these 15 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: St. Charles, IL
4 of the 15 mechanics we list are based in St. Charles; the other 11 serve St. Charles from towns including Elgin (8 mi), Schaumburg (14 mi) and Carol Stream (10 mi). The mechanics on this page are rated from 4.4 to 4.9 across 3,457 reviews; 14 have 50 or more reviews and 13 are rated 4.5 or higher. When customers rate these mechanics on specific qualities, they most often praise professionalism (89%), quality (87%) and value (71%). The topics that come up most in reviews of the mechanics on this page are "diagnosis", "honest" and "fair". 5 are open on Saturdays. The services the mechanics on this page list most often on their websites are brake repairs (3), engine diagnostics (2), engine repairs (2), oil change service (2) and preventative maintenance (2). 6 list staff certifications (ASE) and 10 have a BBB rating of A or A+. 14 have ten or more years of experience, the longest 75 years. 3 offer financing; 8 are family- or locally-owned and 7 list coupons or special offers. 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 St. Charles?
Online booking is offered by 5 of the 15 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.
Clark's Car Care Inc
“Excellent customer service / very knowledgeable and efficient!!”
Tuffy Tire & Auto Service Center
“They will always inspect the vehicle and let you know if it needs maintenance.”
Casey Automotive
“Joe and his crew had a diagnosis and fixed my car within 24 hours, no fuss!”
Car Doctor Jr
“They are honest and they have a customer for life.”
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Farnsworth Auto
“Thank you, very good service, even more so because it is in Spanish and the workers are very attentive.”
Techworx Inc.
“Xavier was great and extremely helpful!”
Lord's Auto Clinic Inc
“The best places to get your car fixed they are totally honest and do the job right the first time”
Stan's Service Station
“Car came back to me in fantastic condition”
Chicago Auto Center
“I noticed they had some real nice domestic cars in their shop so it felt really good to know these guys deal with some elite cars as well as your every day drivers.”
Why these companies made our list
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