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 2019-2024 Chevrolet Blazer 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.
Surge tanks and caps are pressure-rated to the specific system, and a wrong cap is a slow way to cook a head gasket.
Heating and Air Conditioning
Watch for a clicking or ticking behind the dash when you change temperature. 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.
R-1234yf systems on newer GM vehicles use different oils and fittings than older R-134a systems.
Electrical and Charging
Watch for the auto stop-start feature quietly deactivating itself. Batteries in Texas heat routinely give up between three and five years. Test annually after year three, before the first cold snap.
Many recent GM vehicles need the new battery registered to the module or the charging system will keep undercharging it.
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 have been selling GM parts online since 2009 and out of the Dallas store since 1956. Start with our Chevrolet OEM parts catalog, or search for Blazer parts.
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