No Heat - Chevy Colorado & GMC Canyon

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Old 12-15-2009, 08:14 PM   #1 (permalink)
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Default No Heat

My Mom has an '08 Colorado and I'm trying to help my Dad to identify her no heat problem. It don't sound like the resistor/ connector problem that I'm having on my truck. He sait that all four fan speeds work at all times, but she's not getting hot air. He said that when he switches the thermostat back & forth from hot to cold he gets "lukewarm" air. Any clues as to what the culprit might be?
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Old 12-15-2009, 08:36 PM   #2 (permalink)
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Default Re: No Heat

Do you have a Scangauge or something to get the Water Temperature? Might be a thermostat stuck open so the engine doesn't get warm. Short trips in cold weather? What's the temp. gauge at when the truck's running?
(Sorry for the questions to answer your question but I think we need more info)
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Old 12-15-2009, 09:06 PM   #3 (permalink)
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Default Re: No Heat

I have a scangauge that I can plug into her OBD latwer this week. I'll give that a try. If the water temp doesn't get to where it should be, I'll assume that the thermostat is the problem. Thanks.
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Old 12-15-2009, 09:09 PM   #4 (permalink)
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Default Re: No Heat

i know exactly what the problem is....

take the radio bezel off, and then take the HVAC controls out, there is a white plastic piece on the back of it where the bicycle type wire has a triangular mount, it has probably popped out of that plastic piece that holds it stationary...the knob still turns, but never shifts the flapper to heat....
i just had the same problem a couple wks ago
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Old 12-15-2009, 09:15 PM   #5 (permalink)
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Default Re: No Heat

Quote:
Originally Posted by rtmsu_02
i know exactly what the problem is....

take the radio bezel off, and then take the HVAC controls out, there is a white plastic piece on the back of it where the bicycle type wire has a triangular mount, it has probably popped out of that plastic piece that holds it stationary...the knob still turns, but never shifts the flapper to heat....
i just had the same problem a couple wks ago

Ok awesome, I'm sending a link to my Dad to follow this thread. The replies so far should help him to narrow the problem down. I'll post up when we figure out what the solution actually is. we appreciate the help. :D
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Old 12-15-2009, 09:34 PM   #6 (permalink)
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Default Re: No Heat

Quote:
Originally Posted by Augsdoggs
Quote:
Originally Posted by rtmsu_02
i know exactly what the problem is....

take the radio bezel off, and then take the HVAC controls out, there is a white plastic piece on the back of it where the bicycle type wire has a triangular mount, it has probably popped out of that plastic piece that holds it stationary...the knob still turns, but never shifts the flapper to heat....
i just had the same problem a couple wks ago

Ok awesome, I'm sending a link to my Dad to follow this thread. The replies so far should help him to narrow the problem down. I'll post up when we figure out what the solution actually is. we appreciate the help. :D
If that's the problem, you should be able to notice without even pulling the cover off the HVAC controls, there will be absolutely no resistance when you turn the temp dial.

Hopefully that's it :)
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Old 12-16-2009, 09:10 AM   #7 (permalink)
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Default Re: No Heat

In the mean time, apply the sheet of cardboard remedy, just keep an eye on the temperature gauge..
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Old 12-16-2009, 11:05 AM   #8 (permalink)
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Default Re: No Heat

One of four things listed in order of probability:

A heater control problem. The fix was was described previously in this thread.

A thermostat problem. If the driver / owner knows where the temperature gauge normally reads simply look at the gauge and see if it is much lower than normal. Mine is up to full temperature in less than 5 miles when the outside temperature is 10 degrees F. If it isn't up to normal after 5 miles then it is probably a thermostat problem.

Low on coolant. Check the coolant level in the radiator not just in the overflow bottle.

Plugged heater core. This is very common on GM vehicles since they started using Dexcool antifreeze. If the coolant has ever been low and air got into the system, Dexcool will crystalize and plug up things. The first thing to plug up is the heater core. You can fill up the system and backflush the heater core with a garden hose. If this is your issue, I would some time in the near future dump the Dexcool (AKA Death-Cool), flush the entire system with a good cleaner, and refill it with a good non-Dexcool antifreeze. There have been lots of law suits against GM over Dexcool crystallization and lost engines.

The above are my best guesses. You mileage may vary.
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Old 12-16-2009, 02:22 PM   #9 (permalink)
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Default Re: No Heat

08 should not have DEATHCOOL problem as she would not have miles on it to cause problem.also always put the DEXCOOL back in ,not green stuff.just change the anti-freeze every 3 years and not let it go beyond that,i do mine every 2 yrs as its cheap and i do it myself.
i had DEATHCOOL problem bigtime in my chevy silverado 4.3 liter v-6.no way i will ever let DEXCOOL in my truck past 3 yrs.
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Old 12-16-2009, 02:26 PM   #10 (permalink)
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Default Re: No Heat

Quote:
Originally Posted by naskie18
Quote:
Originally Posted by Augsdoggs
Quote:
Originally Posted by rtmsu_02
i know exactly what the problem is....

take the radio bezel off, and then take the HVAC controls out, there is a white plastic piece on the back of it where the bicycle type wire has a triangular mount, it has probably popped out of that plastic piece that holds it stationary...the knob still turns, but never shifts the flapper to heat....
i just had the same problem a couple wks ago

Ok awesome, I'm sending a link to my Dad to follow this thread. The replies so far should help him to narrow the problem down. I'll post up when we figure out what the solution actually is. we appreciate the help. :D
If that's the problem, you should be able to notice without even pulling the cover off the HVAC controls, there will be absolutely no resistance when you turn the temp dial.

Hopefully that's it :)

very goodpoint, may save him tearing off things.he should be able to FEEL if its opening /closing in there thru the dial feeling.
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