cardoesntwork555

Hi, I've been browsing here the last couple days as I troubleshoot and look for possible fixes, but nothing has worked thus far. This is my first major issue with the car since my parents gave it to me 2 years ago as my first car, and it has me stumped. My '06 LT has been having issues with the defroster and AC for a couple weeks now, but didn't die until last Thursday. I have replaced the resistor, but to no avail, and I have found that the blower isn't getting power from the wires running to it, and that my climate control module isn't getting a signal off of my meter. I'm not technically sound in the slightest, so I have limited knowledge of how to proceed from here. Any help is appreciated.

RJ_RS_SS_350

to the forums!!

The 2006 had an issue with the butyl patch(you can search for those 2 words).

There are fuses for the climate control, #10 and #16, and relay #30, in the floor console fuse block.

The defroster turns on the AC, so if the AC compressor is not running, the defrost won't work properly. So also check the underhood fuse block, fuse #15 and #22. In the same fuse block, there is a diode for the compressor, #9, I don't know how to test that, maybe someone else here does.

That gives you a few simple things to check.

cardoesntwork555

Alright, I'll try that and get back to you.

donbrew

Power does NOT go through the resistor or the switch. Power is always hot on the other side of the motor, the switch controls the the path to ground through the resistor pack.
The compressor will not run unless the blower is on
Are you saying the fan does not run in ANY mode or that the compressor does not run?
Is the CEL on?

cardoesntwork555

The fan will not run at all, regardless of mode. For a time it would run on high only if I got to 25mph, so wouldn't defrost in the mornings. Check engine light has been on for a while because of an issue with a cam sensor, so I don't know if it's also on because of this.

cardoesntwork555

Should also mention that the compressor attempts to cycle, but it doesn’t stay on.

donbrew

Was the fan actually running at 25 MPH, or that was when you could feel air flow?
What code numbers are causing the CEL? Are you absolutely positive there is only one? P0128 is an intermittent code that depends on the coolant temp and will inhibit the compressor.
P0016 or P0017 don't imply any sensor , they imply bad timing chain.
Fan on high only indicates bad resistor pack.
You have a bunch of different possible scenarios.
, possibly more than one problem.
With the key on there should be 12 volts at the hot side of the blower motor ground the other side to test the fan.
check for continuity to ground through the switch on each position; after you check for continuity to ground through the resistor pack.
If all of that checks out you need to figure out the compressor. That might be caused by the signal from the switch to the BCM that tells it the blower is on.
Here is a pdf of the circuit

ACcircuit.pdf

greg8453

Our terminology needs a review. I assume you have a problem with the blower motor. Here's the diagram for it. It it doesn't run at all it easy to check the power and ground circuits to narrow down the problem.

Oldblue

Pull the waterfall, remove the hvac controller and inspect the back side for melted plastic at the connectors.