GM Parts Club
The Fourth is peak heat and peak traffic, which is a bad combination for a cooling system nobody looked at. Here is what to actually look at, using a 2021-2026 GMC Yukon as the example.
Cooling System
Watch for crusty orange residue around a hose clamp or the surge tank seam. GM’s long-life coolant is generally rated for 5 years or 150,000 miles on the first fill and 5 years or 100,000 miles after that. Hoses and the surge tank should be inspected annually once past 80,000 miles.
GM cooling systems are DEX-COOL based and the seal and gasket materials are chosen for that chemistry.
Heating and Air Conditioning
Watch for air that only blows on the highest fan setting. Cabin air filter every 12,000 to 15,000 miles, or annually. In North Texas with construction dust and cedar season, annually is the honest number.
Blend door actuators are calibrated position devices, and the module learns their travel; generic units frequently will not calibrate.
Electrical and Charging
Watch for warning lights that appear in clusters and then clear themselves. Batteries in Texas heat routinely give up between three and five years. Test annually after year three, before the first cold snap.
GM’s battery management system is calibrated to a specific battery chemistry, group size and reserve capacity.
The Short Checklist
- Radiators: Engine, tow package and rear-A/C content all change the radiator and hose part numbers. Have the VIN ready.
- Cabin air filters: Rear climate content, heated and cooled seats, and tri-zone systems all change the parts list.
- Batteries: Vehicles with stop-start often use two batteries. Confirm which one you are replacing before ordering.
We stock genuine GM parts for every nameplate on this list and ship nationwide from Dallas. Start at our GMC OEM parts catalog, or search for Yukon parts if you already know what you need.
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