ac/heating fan? - Chevy Colorado & GMC Canyon

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Old 12-19-2011, 09:09 PM   #1 (permalink)
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Default ac/heating fan?

I have a 2004 gmc canyon. I've had no problems until a few months ago when I heard a loud flapping sound coming from under the passenger glove box when i turn my ac or heat on. It sounds like a broken fan to me. A lot similar to what you would hear if you left the end of a t-shirt flapping in a room fan. And there is no heat coming from that area(only heater not working)

I guess my question is, is there a way to take out that fan or get to it and see if there is a problem myself. I would take it to the shop but I currently am very low on funds and honestly if I can get the loud annoying noise to stop without having to dish out 100's of $ it would be great.

Note: Sound only happens when I have ac or heat on.

Thanks in advance.
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Old 12-19-2011, 11:09 PM   #2 (permalink)
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The blower/fan is located above the passenger's feet. If you look under/behind the glove box (you can take the glove box out by removing three screws/bolts along the bottom - no need to however unless you need access to the wire harness.

Anyway, you should see a four wire connector sticking "up" into the middle of the blower motor. If you just want to disable the fan you can push the release tabs on the connector an pull it out. That will prevent the blower from running, but you can still set the heat to be on, you just will not get much heat unless the vehicle is moving...could be a problem on defrost if yoiu are in cold country.
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Old 12-21-2011, 06:48 PM   #3 (permalink)
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Quote:
Originally Posted by Jerry_NJ View Post
The blower/fan is located above the passenger's feet. If you look under/behind the glove box (you can take the glove box out by removing three screws/bolts along the bottom - no need to however unless you need access to the wire harness.

Anyway, you should see a four wire connector sticking "up" into the middle of the blower motor. If you just want to disable the fan you can push the release tabs on the connector an pull it out. That will prevent the blower from running, but you can still set the heat to be on, you just will not get much heat unless the vehicle is moving...could be a problem on defrost if yoiu are in cold country.

Thanks for the reply! Unfortunately I do live in Canada and its -25 Celsius outside every morning. So I do need to have some of the fans blowing. But I did notice there were different colors to the 4 wires going up into the blower. If I wanted to only disconnect the blower under the glove box could i do this by disconnecting the right wire? And if so what color wire do I disconnect?

Thanks.
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Old 12-21-2011, 07:12 PM   #4 (permalink)
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I had this problem just the other day! My heat was working, but I was getting the flap, for sure! Pull the three screws holding the blower motor in place (the last one in the corner is a dog to get to, you'll need swivel joints and whatnot), and inspect the squirrel cage. Mine had leaves in it, acting like cards in wheel spokes... Pull those out, and you should be good. I am assuming, you may have more in there, preventing flow. Good luck!
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Old 12-21-2011, 08:21 PM   #5 (permalink)
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The four wires are the different speed wires for the blower. The blower is connected to battery through a relay and fuse and then to the input on the resistor - it also connects directly to speed 4 (high) to get the ground side. If the blower is working, it should work in speed 4 even with the 4 wire connector released, I believe.

There is a schematic available, if you can read them you'll know what all the wires connect to and what they are used for.

If you, as the previous post suggests, have a stuck motor fan (squirrel cage) then by all means get it cleaned out. I have never pulled the motor and do not know how hard it is.

Do a search on heater blower to find lots of information including link to the schematic. If you can't find it, I will take a look for you myself.

I haven't re-read you post, so I may have lost contact with what your problem is.
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Old 12-22-2011, 10:52 AM   #6 (permalink)
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If you haven't already discovered the trouble shooting details, including a link to the schematic for the fan system you can find it here:
A/C Fan Speed Problem
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