Blower control failure, intermittent. Failure of the controls in the first three levels and at times all levels of the control resulting failure does not allow the windshield to defrost or clear in inclimate weather. Full function may return upon restarting the engine.

- Auburn, IN, USA

Went to turn on the cabin fan on speeds 1-3 and the fan would not turn on. Speed 4 (the fan has 4 speeds), the fan would come on. After giving the truck time to warm up, sometimes the fan would then turn run on the lower speeds. This happened a many times during the summer. Sometimes, even given 20 minutes of running the vehicle, the fan would not run on lower speeds. After a month or so without doing anything, the fan worked as expected. Lately the problem started to reappear, again, the fan would only run on high. Just like before, even given 20 minutes of run time, the fan would not run on lower speeds. The fix was two fold. The root cause of the issue was a bad grounding block, that then would cause a short in a wiring harness. The grounding connection for the fan, was secured. Second the wiring harness for the fan control along with a resistor had to be replaced. Pictures of the burned resistor and wiring harness can be found at www.flickr.com/photos/imrambi/sets/72157622545918308/. as shown, there is burnt plastic where the wiring harness connects to the resistor. The resistor is inside the cabin near carpet and other flammables and posses a fire hazard. Updated 07/10/2012

- Nashua, NH, USA

I own a 2006 Chevy Colorado I had the brake light switch replace due to recall on March 2006 three years later the same problem happen again the brake switch went out. Chevy Corp said since the repair/recall was already performed I would have to take it back to the dealer ship to get it look at again and the same part that failed was going to be an out of pocket expense. I don't think I or anyone else having the same problem should have to pay for a defective part. This poses a serious problem because it caused me to loose my brake lights and almost got rear ended four times. This poses a very high danger because when you are driving you do not even know when you loose your brake lights there is no indications or messages from the dash board that your lights are out. This is just an accident waiting to happen hopefully there are no deaths involved. Thank you for taking the time to read this complaint.

- Houston, TX, USA

The blower motor started to only work on the high setting, 4, all other settings, 1,2,3, were not working, I thought the blower control switch may have been bad. I checked with the dealer, the part to replace the switch is the whole control panel, $200. I wanted to make sure that was the problem before spending the money. I checked on the internet and found this is a common problem with Colorado's. it turns out that the blower motor resistor block and connector are suspect. I did in fact check this out and found evidence of over heating on the connector. I can get the fan control to work properly by moving the wires on the connector to the resistor block. I think this is a safety concern due to the fact that others have reported the connector actually being melted from over heating. GM does not have any service bulletins or recalls out for this issue. On the internet search there was additional information concerning the grounding block in the engine compartment that has led to several electrical problems. I also found my grounding block to have had some corrosion build up that may have caused problems with my electrical system. My passenger side power window was intermittent. I cleaned the corrosion on the grounding block and everything is working properly.

- Shalimar, FL, USA

The back lighting of the instrument panel just failed. No intermittent failure, one second it was working the next it did not. All instruments within the instrument panel appear to still be working, but you cannot read the instrument cluster at night, which makes it impossible to determine speed. The dealer checked it out and determined that this failure was common in this model, and that the entire instrument panel ($$$) has to be replaced (you can't just replace light bulbs). This is a manufacturing defect the dealer refuses to repair under warranty.

- Madison, GA, USA

Truck misfiring on all cylinders since around June 2007. Check engine light on some, off some. June 19 dealer said misfiring on all cylinders and they were stumped. They first guessed bad gasoline then said computer needed reconfiguring. Still misfiring when I left shop. On July 19 returned to dealer. They said it was a GM problem that GM was aware of...possibly crankshaft sensor and for me to come back in two weeks. On Aug 18 I took truck back to dealer after engine quit in a rolling turn in middle of intersection. Dealer replaced fuel pump and spark plugs and said they thought water was in fuel. Don't go back to same gas stations they said. I haven't. truck still was misfiring when I left. On 9-26 I went back to dealer. Truck engine shut off while I was doing 70mph down busy interstate. Made it to side of road, restarted and continued on my way. Dealer said it was computer loosing communications internally and had clogged fuel injectors. Left dealer and truck still misfiring. Drove it for a day or two and when friend who went to lunch with me wondered if we were going to make it back from lunch I decided to call dealer. Called dealer and was told it was a software problem and that GM is working on it. Groan! truck is almost out of warranty and I am wondering when next time engine will quit running and under what driving conditions. Thanks....roger dowdy

- Cottontown, TN, USA

2006 Chevrolet Colorado - 4 door - 5 cylinder engine - 4 wheel drive truck has shut down while driving it with no warning. This has happened 5-6 times. Dealer cannot find problem as it is always running when they get it. It has been towed to the dealer once. This problem is extremely dangerous as there is no warning. The engine just quits. Once the engine quits and you get the truck off the road, you simply cut the key off and restart the truck. One time I could not get it to run again and it had to be towed. I cannot begin to tell you how scary this is when you are in traffic and have no place to go. The dealer tells me to keep driving the vehicle as the computer shows no problems.

- Burleson, TX, USA