Re: heater fan switch only works on 4. nothing on 1-2 or...
I had the same problme on my 2005 blower. I found a faulty connection in the wiring harness behind the glove box. Cleaned and rebent the pins to make better connection and it has worked fine ever since. I also had the same faulty connections on the front driving lamps. Had to clean and rebend pens to make proper connection.
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I think there was a recal for this problem. I would go to the dealer and check and see if your vehicles has had all the recals taken care of. I have a 2004 since it was new and I took it in for a brake light recal and I believe a blower motor issue.
I have a 2004 Colorado since it was new. There was a recal for the blower motor problem. I think it was for a defective connector to the blower resistor assembly. There is also a recall for a bad brake light switch. I would take your truck to the dealer and get this recall work done.
TRY THE BLOWER MOTOR RESISTOR FIRST. POWER GOES THROUGH THE BLOWER THEN TO THE RESISTOR AND THEN THE CONTROL MODULE TO GROUND.
THE RESISTOR IS ON THE BOTTOM OF THE HEATER CASE ON THE PASSENGER SIDE. USING A TEST LIGHT ATTACHED TO GROUND TOUCH EACH OF THE TERMINALS ONE AT A TIME WHILE SWITCHING THE POSITIONS ON THE BLOWER CONTROL. IF THAT WORKS YOU WILL HAVE A LIGHT FOR EACH WIRE IN EACH POSITION ON THE DIAL. THE RESISTOR IS THE PROBLEM THEN.
RESISTOR WIRE COLORS LOW = YELLOW 2 = TAN 3 = LIGHT BLUE HIGH = ORANGE
You say your heater fan only works on high.
This issue can be repaired by replacing what is called the "blower motor resistor". The electrical current flows through this unit in all positionsexcept #4.
If you look under the dash on the passenger side with the heater fan on #4 you will hear the blower motor running. Just slightly toward the drivers side of the blower motor & closer to the firewall you will see a four wire connector. this is attached to the "blower motor resistor". If you get a replacement one & examine it you will see two screw holes where you will need to remove the 9/32nds screws from the one in your truck to remove the fauly one & install your new on. This part is relitivly inexpensive & it is not worth trying to locate a used one.
Please let me know if you need more info on this
I had the same problem on my 2005 Colorado. I changed the blower resistor but still had the same problem. I had no voltage at the blower except on high. After talking with the local Chevy dealer, I found the plug-in connector that goes to the resistor had a burnt place on one of the terminals. AC offers a kit that you can splice into your existing wiring. Took me around 30 minutes to change. Costs around $50. So be sure to check the plug before changing anything out.