no rear air on 2002 denali

[WDE]

No air flow at all in the rear , like said just quit and front works fine

---------- Post added at 06:09 PM ---------- Previous post was at 06:04 PM ----------

Front works fine and rear has no air flow at all none

 

[Vette66]

Check the front fuse panel (under the hood) there is a rear hvac fuse that should be the one that would go out if it's a fuse. Not sure why we are blaming actuators or vacuum problems yet when he has not checked the fuse or the controls.

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[WDE]

It says RR HVAC

 

[Vette66]

yes and the front says ft hvac

 

[zieglerj-pdm-specialist]

Hey

Check the front fuse panel (under the hood) there is a rear hvac fuse that should be the one that would go out if it's a fuse. Not sure why we are blaming actuators or vacuum problems yet when he has not checked the fuse or the controls.

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View attachment 23181

Because if a fuse blown something else would have went out on the guy. If it turns out to be electrical he is in the ***** because what would have blown it. Rarely does this come with one problem others will follow and if he gets ac in the front the back it is ran off of vacuum in 2002 so its either vacuum hose is disconnected or the actuator is not opening to allow the air flow back to the Rear. School is good for people. Make people educated

 

[WDE]

So how would I go about checking this to see if this is the problem?

---------- Post added at 12:16 PM ---------- Previous post was at 12:14 PM ----------

Also all fuses are fine. Already checked those where is the vaccum located

 

[Vette66]

Other than checking fuses I have no answers. I take things apart until I understand them and figure out the problem. So I have no answers for you. zieglerj-pdm-specialist seems to have some answers maybe he will help out.

 

[zieglerj-pdm-specialist]

I agree with Vette Check for fuses

Other than checking fuses I have no answers. I take things apart until I understand them and figure out the problem. So I have no answers for you. zieglerj-pdm-specialist seems to have some answers maybe he will help out.

Check for fuses just to make 100% nothing is blown. And if there is nothing wrong electrically I would look for two fans one fan for the front the other for the rear if it has one. Just following up on Vette's recommendations. Actually there has to be two fans because if you have it on high in the back its not on high in the back. Vettes right look for fuse and then the second blower fan for the rear. The have to be close because they both would run off the same condenser and heater. Which means it would have two different solenoid actuators to mix the air correctly. Follow it back to the fan if the fuse is not blown and the fan is usually on the firewall or behind the cubby hole. Keep me posted on what you find and Ill do my best to help you out from there. Good luck and don't hesitate to write with any questions. Take Care man.

 

[WDE]

Now could it be a resistor In The second blower and cause it not to work?

 

[Vette66]

I would check voltage if you suspect a blower not working.