A/C not blowing in front, only when moving. Rear, ok.

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Sep 16, 2023 | 4:32 PM

#31

jakew

CF Beginner

Joined: Sep 2023

Posts: 3

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Quote:

Originally Posted by mountainmanjoe

first step in electrical problems is to check fuses

Please elaborate. You mean you feel air coming through the vents while the vehicle is moving?

I checked all fuses and troubleshooted them, fuses are all fine, and yes only when moving does it deliver any air.

Sep 16, 2023 | 5:42 PM

#32

mountainmanjoe

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Joined: Feb 2017

Posts: 6,207

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@jakew
On your vehicle the climate control system is controlled by two computers: the HVAC control module, and the blower motor control module.

It's going to require some comlex troubleshooting using a bidirectional diagnostic tool to narrow down the problem.

Dec 8, 2025 | 9:51 PM

#33

tintsince97

CF Beginner

Joined: Nov 2025

Posts: 2

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Quote:

Originally Posted by John Kevin Williams (TheJohhnyCat)

I have a 09 Suburban LTZ. The back blows out hot/cold perfectly. I can change the power of blow and everything. But the front doesn’t blow at all, unless moving then it flows decently well. I have replaced the resistor and checked the motor and it is perfectly fine. When I plug the motor into the resistor sometimes I get lucky and it’ll work. But it only works for maybe a day, if I’m lucky. Sometimes it’ll quit working within the hour. I have no clue what else to do.

I have an 09 Suburban LTZ and im having the same problem. Nothing works up front the A/C or defroster, but the rear unit work just fine. did you have any luck?