GM Parts Club
Air conditioning that is cold at speed and warm at a stoplight is telling you something specific. Here is what to actually look at, using a 2014-2018 GMC Sierra 1500 as the example.
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.
Condenser and evaporator core dimensions are specific, and a near-fit leaks at the seal.
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.
Aftermarket radiators frequently use fewer rows or thinner tanks than the original, which shows up as a heat problem only when you tow.
Filters and Fluids
Watch for a diesel that derates or throws a fuel pressure code on a neglected filter. Follow the oil life monitor rather than a fixed mileage. Engine air filter every 30,000 to 45,000 miles. Transmission service intervals vary widely by transmission and by whether you tow.
GM oil filters are built to a specific bypass pressure and anti-drainback valve spec, which matters most on cold starts.
The Short Checklist
- Cabin air filters: Rear climate content, heated and cooled seats, and tri-zone systems all change the parts list.
- Radiators: Engine, tow package and rear-A/C content all change the radiator and hose part numbers. Have the VIN ready.
- Oil filters: Engine size and emissions equipment change the filter, and diesel filter kits in particular are not interchangeable across model years.
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 Sierra 1500 parts if you already know what you need.
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