GMC Sierra 1500 Heating and Air Conditioning: 5 Symptoms Worth Taking Seriously (2014-2018)

Most heating and air conditioning problems announce themselves well before they strand anybody. On a 2014-2018 Sierra 1500, these are the ones worth acting on.

1. Vents that will not switch from defrost to floor

By the time this is obvious you are generally replacing more than one part. Start by looking at blower motor resistors.

2. Air that is cold at highway speed and warm at a stoplight

This one is usually early, which is good news, because it is cheap to fix early. Start by looking at blower motor resistors.

3. A clicking or ticking behind the dash when you change temperature

By the time this is obvious you are generally replacing more than one part. Start by looking at blower motors.

4. Air that only blows on the highest fan setting

This is the symptom people put off longest and regret most. Start by looking at cabin air filters.

5. A musty smell for the first thirty seconds after startup

It rarely gets better on its own, and it usually gets louder before it gets expensive. Start by looking at blower motor resistors.

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.

We are a factory GM dealer, not a reseller, so what you order is the same part the service drive installs. Browse our GMC OEM parts catalog or search for Sierra 1500 cabin air filters.