My 1999 Chevy Tahoe has front and rear a.c. The rear blowsbut not cold. The front doesn't blow out the ventsbut you can hear it and also the motor works. It started out with the high not workingthen mediumlast the low went out. It sounded like the blower motor resistorbut I replaced that and didn't help. Any suggestionsanybody?
SOURCE: Blower motor stays on high, even with key out
the blower motor speed control module is defective, replace it.
SOURCE: 2003 chevy tahoe no rear heat
I know the earlier tahoe's have two heater lines running from the engine compartment to the rear under the vechile. Those lines could be clogged or pinched shut. What you do is get two hose locking pliers. Go under your truck, they are two metal lines that turn into rubber and back into metal again farther down the line. First, checked for pinched lines. If none, find where the rubber hoses are, clamp them off, remove from metal lines and drain. Use garden hose to flush fresh water through. When water comes through at high pressure and pretty clear, it should be done. Reconnect hoses, top off radiator fluid and it should be fine.
SOURCE: 2004 chevy tahoe, dual climate control, blowing different temps
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
SOURCE: Front Blower
ok, missed the part about the rear ac working, the part that causes this is called the air temperature control blend door actuator motor, it is an electric motor driven gear drive that moves the plastic door inside the air ducking to mix or shut off the hot or cold air from the ac evaporator core or the heater core, you will need to replace it.
Testimonial: "Great thanks that could be my problem. Is the motor by the inside coil"
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