Re: no air flow through the rear vents with ac or heat on...
Make sure the control knob on the dash is on "RR". This lets the driver control all the vents in the back. The heat only comes out of the floor vents, if you have the knob on the blue dots that represents the air conditioning in which the cool air will come out of the vents up above in the back. There is also an area on the control knob on the dash where you can turn the knob to shut the heat and air conditioning off. If the knob is in this position then you can control everything with the knob up above the seat right behind the driver's seat.
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verify blower motor is good? Blower motor stuck on high? you need a variable resister. A plug in unit near the motor. make sure that you install completely before checking. The resister need the air flow to keep it cool, you will burn a new one out in seconds if it is not installed in the case before checking.
it's either a fuse or it's a bad blower motor, it could be a bad blower
motor resistor but usually you'll get either high or low only, so if
you have nothing on any speed, high low etc, and all the fuses are ok
chances are it's your blower motor.
Don't worry, it's designed that way. The owner's manual is pretty unclear about this. But the heated air only comes out the floor vents underneath the front seats and the "heat vents" at the forward and side of the rear A/C compartment near the floor. The cooled or vent air flows from the overhead vents.
The problem is a 1/8 diameter hose that runs from the front of the engine over the top and connects at the rear of engine on the drivers side. It is a vacuum hose #GM15967970 It cost about $6.22 at your GM dealer. Hope this helps Bill. My E-Mail is Uflyups@aol.com
On most vehicles with front and rear A/C, the two systems are basically independant of each other just sharing the compressor and condensor. It is possible that the Mode Door (controls where the air flow is sent; ie: windshield, vents, floor) is out of adjustment or sticking.