GM Parts Club
Most heating and air conditioning problems announce themselves well before they strand anybody. On a 2015-2019 Sierra 2500HD, these are the ones worth acting on.
1. Vents that will not switch from defrost to floor
This is the symptom people put off longest and regret most. Start by looking at A/C compressors.
2. Air that is cold at highway speed and warm at a stoplight
By the time this is obvious you are generally replacing more than one part. Start by looking at blower motor resistors.
3. A clicking or ticking behind the dash when you change temperature
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at blower motors.
4. A musty smell for the first thirty seconds after startup
This one is usually early, which is good news, because it is cheap to fix early. Start by looking at A/C compressors.
What to Do Next
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.
Rear climate content, heated and cooled seats, and tri-zone systems all change the parts list.
Everything here is available as a genuine GM part through our GMC OEM parts catalog. If you would rather search directly, search for Sierra 2500HD cabin air filters.
Where to Buy
- Genuine GMC OEM parts
- Cabin Air Filters
- Blower Motors
- Blower Motor Resistors
- A/C Compressors
- Wholesale account setup
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