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Chevy Colorado and GMC Canyon Climate Control

8 messages,  Last post on Jul 31, 2009 at 5:21 AM

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What is this discussion about? Chevrolet Colorado, GMC Canyon, Electrical, Heating / Cooling, Truck

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#1 of 8 Fan motor removal for 2005 Colorado. by brainh Sep 01, 2008 (9:19 am)
I have something caught inside the heater fan, I think a may be a leaf. I had the same problem before when the truck was under warranty so the dealer removed it. Now I would like to get some info on how to remove the fan and get the object out.   Thx, -Brian
#2 of 8 A/C Problem by whl Oct 17, 2008 (6:16 am)
When my a/c is turned on the compressor will only stay engaged for 4-8 seconds before disengaging even if inside truck temperature is over 100 degrees. It will stay disengaged for 6-8 seconds then engage again. It cools OK the 4-8 seconds compressor is engaged & will eventually cool down the cab. But the compressor is constantly kicking in or out every 6-8 seconds. The expansion valve & temperature sensor have been replaced. After trying to fix my truck 3 times dealership says I don't have a problem. Even though it is only cooling 4-8 seconds at a time regardless of inside cab temperature, it is getting cold & is doing its job. Can my Low side pressure of 15-17 lbs cause this problem? I compared my pressure against another truck just like mine, his Low side pressure would vary between 30-38 lbs. The dealership will not tell me what the Low side pressure is suppose to be. I found info on a 2007 GMC Canyon that says Low side pressure 85 degrees should be 30-39 is the 2007 & 2008 Canyon have the same a/c system? Replies to this message: captained (Oct 20, 2008 11:39 am) acking (Mar 13, 2009 1:21 pm) andyjag (Apr 02, 2009 2:30 pm)
#3 of 8 Re: A/C Problem [whl] by captained Oct 20, 2008 (11:39 am)
Replying to: whl (Oct 17, 2008 6:16 am) BAD LOW SIDE. IF THE DEALER CANT SEE THAT GET A NEW DEALER.. LOW SIDE SOULD BE OVER 30 COMPRESSOR MAY BE LOW ON GAS. THAT IT THE NORMAL CAUSE OF LOW READINGS. IF NOT YOU HAVE A BAD COMPRESSOR.
#4 of 8 Re: A/C Problem [whl] by acking Mar 13, 2009 (1:21 pm)
Replying to: whl (Oct 17, 2008 6:16 am) There could be a few things wrong. Suction reeds in the compressor could be sticking or cracked, the receiver dryer could be plugged or evaporator coil could be restricted. The pressures will vary with temperature, what is the ambient temperature of the air outside? High side pressures? Vent temperature? and Low side pressures? All these factors must be considered when trying to diagnose this problem, the dealer is full of crap because you sound like a problem exists. Whether the system is short cycling, kicking out on high head pressure or consists of a low charge, something is wrong. Consult a pressure temperature chart for 134a to verify what your head pressures should be.
#5 of 8 Re: A/C Problem [whl] by andyjag Apr 02, 2009 (2:30 pm)
Replying to: whl (Oct 17, 2008 6:16 am) I have had similar problems , not only on a Cadillac I owned ,but also on my 2007 Colorado. Low side pressure reads25-30 PSI ,High side reads 350 PSI but spikes higher when low side drops. On my cadillac the compressor was internally self destructing & filling the system with tiny flakes of Chrome & other metallic particles which blocked the expansion valve. as for the Colorado , since it is still under waranty I will see what the dealer I bought it from can do about it. ( I've been a mechanic 25 years so it should be fun to see what answers they offer )
#6 of 8 High fan/recirculate by buuba116 Jun 29, 2009 (3:45 pm)
My 2005 Canyon: With the air on, compressor running, everything cooling, when I press the recirculate switch, the light comes on but there is no change in fan speed and whatever air redirect is supposed to take place doesn't. That is---press the recirculate switch and nothing happens. Could this be a relay?
#7 of 8 2004 Colorado Blower Motor Switch Replacement by steve819 Jul 31, 2009 (5:21 am)
#8 of 8 2004 Colorado Blower Motor Switch Replacement by steve819 Jul 31, 2009 (5:21 am)
I have islolated a problem with a nonfunctioning blower motor to the switch, I think. I took the motor out and jumped 12 volts to it and it worked fine so I assumed it was the resistor. Wrong. New resistor did nothing. I got a wiring diagram and it showed that on high speed the switch put the orange wire on the blower motor plug straight to ground. so I place the motor and the resistor on the floor board and stuck a wire in the back on the blower motor plug and grounded it. Bingo. The motor ran. Then I grounded each tap on the back of the resistor to ground and it changed speeds. Am I missing something or does the switch sound like the culprit? The wiring diagram does show a ground in the right side of the engine compartment but it is common to other circuits which are working. If you folks are in agreement that the switch is bad please tell me how to get to it. How do you get that panel off that holds the radio and swicth panel.

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