Question about 2007 Chevrolet Avalanche LTZ
I need to have a little more information to give a well informed answer. I have a 2007 LTZ (dual auto control), and have been experiencing blower problems. Mine seemed to work when it wanted to. At first, I could slap the cover under the passenger side, and it would come on. That trick stopped working, so did some research, and found out that the resistor failure is a common problem. I found a resistor online for $30+. I put it in, and it did not solve the problem. Took the blower out (pretty easy - just pry the plastic locking tab down, and twist counter clockwise - the blower will dop into you hand). I looked at the wire connection on the blower, and noticed the plastic connector was distorted and half melted. I called the local dealer and found out that the connector cost $120.00. I looked online and found an ACDELCO connector for $25.79 (Part # PT731). Put it on, and WAHLA fixed. I hope this helps.
Posted on Jan 25, 2011
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Fig. Typical HVAC operation schematic
An inoperative blower motor could be caused by the following:
* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.
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Fig. Blower motor and fan assembly removal
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Fig. View of the resistor block screws (1), blower motor resistor (2), resistor block wire connector (3), blower motor screw (4), blower motor (5), blower motor wire connector (6), blower motor screw (7), HVAC housing (8), wire harness retainer (9), blower motor screw (10)
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