Cooling System Service in Thornhill, ON

Not too hot or cold, treat your engine just right

For maximum performance and to keep your vehicle in top shape, your engine must remain at a precise temperature between 105-110 degrees Fahrenheit. Servicing your radiator and cooling system will help keep your engine at the optimum temperature for maximum performance. If simple maintenance isn’t enough, the GM Certified Service Experts at Roy Foss Thornhill can perform a cooling system service and flush your radiator to keep everything in order.

Symptoms to look out for:

  • Coolant warning light is on
  • Temperature gauge higher or lower than normal
  • Heather isn’t working
  • Steam coming from under the hood
  • Coolant leaking from the engine

Do you believe you may have problems with your cooling system or radiator?

The GM Certified Service Experts at Roy Foss Thornhill can diagnose and repair cooling system issues and perform regularly scheduled cooling system maintenance such as radiator repairs or replacement and radiator flushing. Regular vehicle maintenance like this is the best way to avoid unplanned repairs further down the road.

If you suspect that there may be something wrong with your vehicle’s cooling system or radiator, book an appointment with a GM Certified Service Expert at Roy Foss Thornhill right away.

Service Specials

Health Check for a Change with SickKids Hospital

Spring is here and your vehicle needs some regular maintenance. Why not help a good cause at the same time? Receive a Tire Swap, Oil Change and Vehicle Health Check as well as donating to the expansion of the World Class Children’s Treatment Centre SickKids.

EXPIRES: 06/30/2024

Save up to $120 in Instant Rebates on a set of 4 new tires

Until May 31st at participating Chevrolet, Buick, GMC and Cadillac Certified Service Dealerships, customers can receive up to $120 in instant rebates when purchasing a set of four new tires.

* Instant tire manufacturer rebates are available when you purchase four (4) identical eligible tires at participating Chevrolet, Buick, GMC and Cadillac dealers in Canada. Instant rebates available: $120 on Bridgestone, $100 on Goodyear Duratrac, Workhorse, Wrangler Steadfast, ElectricDrive and EcoReady tires, $100 on the Pirelli P Zero Family, $70 on all other Pirelli tires, $90 on Firestone, $70 on Continental, $60 on Michelin, $50 on BFGoodrich, $50 on General Tire and $40 on Uniroyal. Offer is valid from April 1, 2024 to May 31, 2024. This offer is non-transferable and may not be combined with other offers. Conditions and limitations apply. Applies to most models, see participating dealers for details. No rain checks available. This offer may be changed, cancelled or extended at any time without notice.

Your local dealer will match the competition's prices. If you purchase one of the tire brands listed below and later find a better price on a qualifying brand within 30 days of the purchase, we’ll refund the difference. Tire Brands: BFGOODRICH, BRIDGESTONE®, CONTINENTAL, DUNLOP®, FIRESTONE®, GENERAL, GOODYEAR®, HANKOOK, KELLY, MICHELIN, PIRELLI, UNIROYAL, KUMHO. The price match applies to the brands listed above. Competitive Prices: The competitive price you find must be in a valid ad, written estimate or Internet quote for identical, new tires. The tires must be an exact match in brand, tire line, size, load rating and speed rating to be eligible for the price match guarantee. All competitive quotes (including internet quotes) must come from a local competing tire retailer and installer (with a physical location within 100km of your participating GM retailer). The competitive price must be valid within 30 days of your purchase of any of the tire brands listed above. Service and Installation: The price match guarantee is only valid on the tire price and does not include installation/labour. Offer available to retail customers only at participating Canadian Chevrolet, Buick, GMC and Cadillac dealers. Offer valid from January 1, 2024 to December 31, 2024. GM Canada reserves the right to cancel, modify or amend the offer without notice. Conditions and limitations apply. May not be combined with other offers and programs.

EXPIRES: 05/31/2024

Senior's Day Every Tuesday

Receive 10% off service at Roy Foss! Contact us for details

Seniors Day Image

Senior’s Day offer applies to customers who are aged 65+. Discount is not eligible for maintenance menu items. Valid for repairs only. All offers cannot be used on past purchases, cannot be redeemed for cash, and may not be combined with certain other offers. Please contact Roy Foss for all offer details.

Complimentary Foss Lifetime Tire Repair

Foss Life Time Tire Repair ImagePurchase a set of four (4) in-stock tires from Roy Foss and you will receive Complimentary Foss Lifetime Tire Repair!†

Complimentary Foss Lifetime Tire Repair offer is only applicable when purchasing four (4) in-stock tires from Roy Foss; rims, sensors, and installation not included. Foss Lifetime Tire Repair offer is only applicable on tire repairs for the purchased tires only and does not include rim damage or rim or tire pressure sensor replacement. Foss Lifetime Tire Repair offer is applicable on repairs involving installation of a tire plug/patch repair ONLY. It does not include tire replacement due to unrepairable tires (tread depth less than 2/32”, sidewall damage, damaged from mechanical failure, collision, off-road use, etc). Maximum claim is $49.95 before tax. Repairs must be completed at Roy Foss.


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Roy Foss Chevrolet Buick GMC Thornhill 43.802789, -79.422113.