2005 tahoe rear ac unit will not come on Front comes on but rear doesn't

Usually a sign one of the blend doors under the dash is stuck or not working correctly.

In most cases once you replace the actuator, you have to calibrate it with a scan tool thru the computer.

ducting problem. not the ac.

Just got an answer from Chevy Dealer. When you replaced the battery it loses its memory as to where the door actuators were (the flaps that control the heat and A/C).

The fix:
Turn everything off and let the car sit overnight. The computer should reset itself during its learnings process.
In the morning turn on the ignition and let the car run for a few minutes before turning on the climate control.

If this doesn't work, plan on 1-1.5hours of labor for a technician to reset the actuators at the dealership.

Good luck.


Car Headlights.

needs more gas ,vehicle with two AC units need around 1.2/1,5 kgs of gas to function

More than likely the problem is with one of the blend doors or its actuator motor inside the HVAC unit in the dash. The repair involves a partial disassembly of the dash to access the parts. This definitely not a thermostat issue.

needs blower motor or blower resistor if it blows on high then it is the resistor if not then it is blower motor

A clogged drip line would be my first suspicion.

Anytime warmer air passes over something cold, there will be condensation. It has to go somewhere, either under the vehicle, or onto the floor.

The fact that you are getting water there indicates that the evaporator is doing its job.

buy a noise suppressor, you can get it at any audio store

Replace Front Blower motor