Alright... I've searched on here for a bit and cannot find this exact problem. I've seen both problems individually but not a fix for both...

My front vents have no air flow coming out of them... My rear vents have air but they do not get hot or cold.

I have checked all fuses and they are good to go.

What is my next step in problem solving this issue??

Thank you for your help,
Jacob

 

Welcome to the forum.

Sounds like the front fan isn't running and no circulation to the rear.

Post year and model for more definitive answers from others.

 

Thank you for reminder!

2004 Tahoe 5.3flex.

I've done some additional research and believe it to be the resistor. However mine has a 3prong back whereas every auto parts store tells me it should be a 5prong....

Has anyone encountered this problem?

 

manual or auto system?
you have 2 separate problems. the rear hvac box is pretty much a stand alone unit.

for the rear system; can you hear the blend door move or feel a slight airflow change from the rear hvac unit when you move the temp blend ****?


for the front unit; check for power and grd to the blower motor at the blower motor connector in each fan speed setting.



the entire system will set dtc for diagnostic purposes but you will need a full function scan tool that can read body codes to access them.

 

Alright! Here is what happened...

There is a cover in the engine bay under neath the plastic that bumps up against the windshield. It covers the fresh air intake. When I pulled it off I could see it was letting water through it which made water fall down into the blower and the speed resistor. Shorting both of them out...

I put an adhesive and sealant around the cover in the engine bay and made sure it wasn't leaking. Then put a new blower and speed resistor in.

The new speed resistors have to be spliced into the old wiring. It's very easy as the wires are color coordinated.

Everything works great now!

 

good find.


what about the rear system. the rear system has it own blower motor, heater core and condenser so that problem should not have any effect of the rear system,

 

rear is normal now.