Heater Blower problem - Chevy Colorado & GMC Canyon

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Old 12-13-2009, 12:11 AM   #1 (permalink)
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Default Heater Blower problem

I ran a search and couldnt find what I was looking for so I guess I will ask.
My heater blower motor drasticly slows down when I slow down.
I have a brand new battery in. Any Ideas what is wrong?
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Old 12-13-2009, 12:20 AM   #2 (permalink)
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Default Re: Heater Blower problem

Could be a bad battery off the shelf. (not unheard of).

Or, just wasn't charged sufficiently when they sold it to you.

Might put a trickle charger on it, over night. If it still does that in the morning, take it in and have it checked and possibly replaced.
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Old 12-13-2009, 09:36 AM   #3 (permalink)
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Default Re: Heater Blower problem

I've replaced the blower resistor many times, the pigtail going to it many times...
then when we got our first snow (Michigan) the blower had no output in any position.

Noted 12vdc Positive is ign relay controlled.
Ground side is switched through the hvac panel to the blower resistor...
Ground goes into a connector in pass kick then out to the g106 splice/ground location (pass side at or near intake filter housing.

Noted cleaning and reattaching did not fix my issue.

Endded up just adding a new ground from the hvac control switch (16g black at switch) to the crash bar in the dash behind the hvac panel.

This has allowed the system to operate again, and no dip in fan speed.

I still have to replace one more blower resistor and pigtail due to the output (pin 3) melting the pigtail and molex of the resistor.

So,
Quick fix... add a second ground path for your Hvac panel switch (only black 16g in the connector at the hvac panel)

Randy
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Old 12-13-2009, 02:59 PM   #4 (permalink)
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Default Re: Heater Blower problem

Ok will have to try it thanks
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2005 Crew Cab Zq8
10,000k hids in highs
10,000k hids in lows
10,000k hids in fogs
high low and fog kit
blacked out fog light housing
totally debadged
smoked led 3rd tail light
smoked led brake lights
Xtreme wheels
2" drop
low pro transmission crossmember
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Old 01-05-2010, 11:32 PM   #5 (permalink)
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Default Re: Heater Blower problem

I have the same issue in my '04. Mine is a manual and I have noticed that when I put it in neutral to slow or stop, my engine speed drops below idle and lopes. My headlights dim as well. I am assuming that and the blower slowing or stopping is due to a lack of power provided by the alternator when the engine speed is too low. The only explanations I have found for this is a slow opening idle air control valve or small vacuum leak that won’t trip a code, but have not been able to check either of those yet. If anyone has more input, I would appreciate their input.

I have checked the blower resistor and noted the melted housing and arc damage at pin C, but that only kept me from opperating the HVAC in setting 1-3 since position 4 bypasses the resistor straight to ground through the switch. After reinstalling, the HVAC worked in all positions until pin C lost contact again.
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Old 01-06-2010, 12:12 AM   #6 (permalink)
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Default Re: Heater Blower problem

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