A/c and heat unit

Asked by Aliciaprosper Sep 14, 2018 at 12:56 PM about the 2004 GMC Envoy XL SLT

Question type: Maintenance & Repair

I can't use the a/c heat or defrost because
my passenger floor gets wet. Also when
ever I crank car I hear a werod noisy in fadu
or under dash like pop and tapping sound

3 Answers
9,730

Mike answered 6 years ago

The poping noise is a bad actuator in the HVAC sysem listen close, mode door actuator, blend door actuator, recirc door actuator, some are easy to change from behind glove box others not so easy.

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