2004 escalade, I have no blower power in front, rear works fine, no heat or cold air and no fuctions, screen lights up and changes are displayed put no air hot or cold at all....hope you can help thanks.

please check rear blower heating control actuator.
it appears that this controllers doesnt work from cold to hot

I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that

There is a blower motor control processor for the back blower - it takes input from the front control and the rear control and decides the fan speed. That processor could be faulty, or the blower motor, or a 30amp fuse in the engine compartment.
In the front system you have a controller and blend doors that direct air thru the heater core and evaporator. You would need to check the operation of those blend doors.

Vacumn hose to operate flap is damaged or somebody kicked on outside of plastic cowl holding flap in place on floorboard,or cable going to slide mechanism,not funtioning....if flap in open position going to get cold air ,has to shut,to bypass fresh air intake,an let only heated air through.....

Hello,I am Ron,I will try and help,,,If the front air works fine,then the expansion valve in the rear air unit needs replacing,If I can help any further,let me [email protected]

i have the same problem, my rear a/c blows great very cold, the front a/c blows but it is not cold at all. I had the the a/c seviced and it was vacumed and correct ammount put back in, no problems, the front still blows but it is not cold, i have checked everything and the a/c guy said it might be the door not opening. any help? still not working

there are two separate actuators for the rear system. one controls temperature and the other controls vents from head to feet. mine problem was the later. that acutuator for esv 2003 is 89018365. it is located just below third seat cup holder passenger side and can be replaced simply by removing cup holder. triangular shaped part with wire harness.

one of the second heater core lines is clogged.

Temp. actuator maybe. A electrica motor that moves a door from cold to hot in the rear HVAC unit . Removing the rear trim panel to get at the auxiliary HVAC unit would need to be done . Search on youtube , video showing how to do it .
Rear auxiliary heat and actuator overview repair for Yukon Tahoe Suburban...
2004 Tahoe rear hvac system only blows cold air diagnosis and temporary fix

Try blowing ou tthe heat exchanger with compressed air. Make sure it's cool b4 removing hoses..