2005 GMC 5.3 with AC, heat controls work, but when you put in on 4 and 5 there's nothing. My guess would be switch... any insight?
Easy fix. GM calls it "Blower Motor Control Processor Replacement"
It's a fancy word for Resistors. It's in a little plastic box. PN 15305077 $20
I found it. Good thing I only put back 2 screws when I changed my cabin filter :rofl2:
I know for a fact there is a different part number between a truck that came with a full console, and one that didn't...Its the same part, but the ducting is slightly different and the part has different mounting holes. I had to do this on my 03 a while back, it was just the resistor, although sometimes the harness will also get burnt up and you will have to buy the harness also, but I did not. Mine was just #5 would not work, 1-4 did. #5 you could hear the relay click, but never make contact.NM, read the quote from nikolai
Dunno, best to call the dealer parts dept with the last 8 of your vin.
Did you ever check out the harness and connector to see if it was damaged? High resistance in the harness would cause the resistor to burn up. BTW the new resistor I installed was clearly better made than the one I replaced.I replaced the resistor at least 3-4 times already
lol no shit, my original one was like little u-shaped bends of wires for resistors.Did you ever check out the harness and connector to see if it was damaged? High resistance in the harness would cause the resistor to burn up. BTW the new resistor I installed was clearly better made than the one I replaced.
Am i missing something here? 5'th gear on my AC doesnt work either, and i can't understand what you guys are doing to fix it. I see the pictures, but can't make any sense out of them. Can someone explain it in "I'm a dumbass" terms? :crazy:
Ok, basically the way the fan control works is that level 5 is full power, and 1-4 actually uses resistors to make the speed slower. Well that piece shown in Denaliano's post is the resistor module. It is really common to go bad, usually taking out the higher fan speeds. It sometimes takes out the harness with it by burning it up from high resistance. pull the cover off the HVAC ducts on the passenger side, and look for the little resistor module, check to make sure that the harness is not burnt up also(I am speaking of the harness with the male end that plugs into the module, the long rectangle connector). The module always goes bad, but the harness does not always going bad, but if the harness is bad and you replace the module, it will soon take the new module out with it. The new module is MUCH better quality, and should give you NO problems afterwards, unless it was connected to an already faulty harness, that by high resistance will cause the new module to fail.Yea me too.
Yep, you could see why my original one failed, it was all burnt up, and the green material on the circuit board had even gotten very hot and peeled. New one was night and day difference as far as quality (At least it appears so, haven't had any problems since).lol no shit, my original one was like little u-shaped bends of wires for resistors.
omg such a shitty half-assed design.
The new one has actual resistors soldered on the board.