Question about 2007 Chevrolet Express Passenger

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The fwd vents are not blowing the way they should but the back vents are working fine

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One of three things is happening if it's not the A/C system itself, like a leak, or a bad compressor:
1. The blower motor is going out.
2. The blower motor resistor is going out.
3. The vacuum line on the heater valve has popped off.
4. Fan Clutch is going out.

How to eliminate each one:
#1 If you turn the speed dial and the motor doesn't speed up like it should, it's probably the motor.

#2 If you have NO blower at some point on the speed dial (for example, you have blower on 1, 2, and 3, but nothing on 4, or nothing on 1, 2, and 3, but 4 works, or all positions are full blast) it's the resistor.

#3 is pretty deceptive. You will be fine while cruising down the highway, but when you hit a hill, or load the engine a little, the air will start blowing up the defrost vents. If you look under your coolant surge tank, right behind the A/C drier/accumulator (shiny aluminm cylinder thing that will be wet if you have the air on) you will see a black, round, thing with black hoses hooked to it. There should be a small black vacuum line stuck in the end of it. The line will have a 90 degree rubber end on it. If it is not there, it's popped off. I don't know why they do this, but they do. The line will be close, feel around for it, and stick it back on. Put your coolant surge tank back on and you're set.

#4 You can diagnose that by listening for a chattering or rattling sound at the front of the van while it is idling, or WITH THE ENGINE OFF reach behind the fan shroud and see if you can wiggle the fan front to back. If it wiggles, it's bad. MAKE SURE THE ENGINE IS OFF BEFORE TOUCHING THE FAN!!!!

There are a few more things it could be, but these are the most common ones in my experience. I work for a mobile fleet maintenance company and I service about 250 2007 to 2009 Express vans...I see a lot of the above 4 things. RARELY is it the A/C system.

Posted on Aug 05, 2010

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