20% OFF $100+ orders using code: DAD20 Online, Ship to Home orders only. Max discount of $50. Valid 6/16 – 6/22/2026. Shop Now | Get Details
What is a Cooling System?
A properly maintained cooling system will help your vehicle run its best and prevent the engine from overheating, which can result in engine damage or head gasket failure. Keep an eye out for these failing cooling system signs.
Overheating occurs when a vehicle’s cooling system fails to regulate the engine’s temperature, often caused by issues like low coolant levels, a malfunctioning thermostat, a faulty water pump, or a clogged radiator. This can lead to serious engine damage, decreased performance, and even complete engine failure if not promptly addressed.
Coolant leaks happen when the fluid designed to regulate the engine’s temperature escapes from the cooling system, commonly causing antifreeze or coolant puddles. Checking hoses for signs of cracks or damage, or tracing leaks from below the vehicle, is often the easiest way to narrow down the location of a leak. Low coolant levels should be topped off and the leak should be investigated and repaired as soon as possible to limit the risk of overheating.
This issue can often be identified by a temperature gauge that rises and falls unpredictably. It’s most commonly caused by low coolant levels, air pockets in the cooling system, or a malfunctioning thermostat. When filling your cooling system, be sure to use the coolant specified for your vehicle. If you use concentrated coolant instead of a pre-mixed 50/50 formula, use distilled water in equal proportion to the coolant for the proper ratio.
O'Reilly Automotive, Inc. | 233 S. Patterson, Springfield, MO 65802 | 1-888-327-7153
20% off $100+: Valid on regularly priced in-stock items for Ship to Home orders that when purchased together total $100 or more (before tax, shipping and discount) on the OReillyAuto.com website only. Excludes AIRAID, B&M, Bully Dog, DeVilbiss, Edelbrock, Flowmaster, Holley, Hurst, Ingersoll-Rand, K&N, MSD, SCT, and Spectre items.
To Redeem Offer: Add qualifying items totaling $100 or more to your shopping cart and select “Ship” as your delivery method. Enter promo code DAD20 in the cart. The total in your shopping cart will be adjusted after promo code is applied. Excluded brands contribute toward minimum purchase amount to qualify for offer but are not eligible for discount. (Maximum $50.00 Discount.) Valid Tuesday, June 16th to Monday, June 22nd, 2026 (11:59pm Hawaii Time Zone). Coupon code is not redeemable for cash, is nontransferable and cannot be replaced if lost or stolen. Not valid on same-day delivery orders. Void if copied, transferred or where prohibited by law. Customer pays sales tax and shipping fees.
Offer subject to adjustment due to returns, cancellations and exchanges. Additional taxes and duties may apply. Not valid with any other promotional gift with purchase. Offer may be modified or discontinued at any time without notice.
Offer Terms: Offer does not apply to gift card orders. Offer does not apply to Lead-Acid batteries. Cannot be used in combination with any other certificates, offers, or discounts or for payment on account. Not valid on previous purchases or store purchases. Shipping & handling and taxes do not qualify towards the minimum purchase. Valid for retail customers only. OReillyAuto.com only ships orders within the U.S.
Excluded Brands: Offer does not apply to AIRAID, B&M, Bully Dog, DeVilbiss, Edelbrock, Flowmaster, Holley, Hurst, Ingersoll-Rand, K&N, MSD, SCT, and Spectre items.
