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Posted on Feb 17, 2010
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My canyon,s heater motor only works on high, is there a relay switch that has gone bad?

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  • Posted on Feb 18, 2010
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There is a blower moter resistor on the back of the hvac box.
All 4 blower speeds go through this resistor. orange/hi-lit blu/med-tan/lo
and yellow is lowest. There is an hvac relay in the fuse block under the
hood. But I believe it just provides 12v to the resistor, so if it was not
working, the blower would not have high either. Hope this helps.

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  • Posted on Feb 18, 2010
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The blower motor resistor is bad it is under dash on passenger side

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  • Posted on Apr 15, 2010
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Ok, so if i had the same problem, replaced the resistor ( 10 minutes ) and 2 hours later it blew.........what would you suggest y next step is? Voltage regulator maybe? I had 2 signal bulbs, a head light and fog light all go in last 12 months.......

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Related Questions:

1helpful
1answer

2004 canyon no voltage at heater resistor
The resistor provides the ground circuit for the blower motor. So you would need to have power at the blower motor first. Grounding the motor or resistor should make the motor run.
The blower motor gets power from a 30amp fuse which gets power from a relay.
Read full answer
Jan 18, 2014 • 2005 GMC Canyon
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Heater/ac motor works intermittently on lees than high speed, works on highest speed
blower motor might b going bad bearings inside mine did same but when replaced it got all speeds back
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Aug 25, 2012 • 2005 GMC Canyon Crew
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My heater works but wont blow out any vents. replaced blower motor
Under your hood, passenger side bolted right in the middle of your air conditioning unit is a lone relay screwed in with 2 screws. That was the reason my 92 Blazer wouldn't blow 99% of the time. Knew it wasn't likely the motor since mine worked sometimes, and motors usual are just good or bad. The low/med/high fan speed switch has a resistor in it that can also go bad, I changed that 1st, no change, swapped out that $6 relay and now I have a fan again :) Those are really the only 2 things causing your problem unless your wiring is a wreck or something unusual. Bonus: relay's a 5 min fix taking your time.
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Nov 29, 2010 • 1992 Chevrolet S-10 Blazer
0helpful
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Fan motor doesn't work on 1-3 but works on 4 for the A/C and Heater. Is it a fuse or switch problem?
It's your blower motor resister. It is located on or near the blower motor. This, when it goes bad, will cause your fan to only work on high.
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Sep 03, 2010 • 2005 GMC Canyon
1helpful
1answer

My Blower motor for my heater on a 99 ford escort is not working.Is it the motor or resister that is gone??the fuses look ok where is the resister located can you send a diagram
look in passenger foot well on blower case for 4 wire connector.



Behind right side of I/P, A/C-heater plenum


resister bad would still allow high speed. may be blower motor.

  • The blower motor does not operate/does not operate correctly
  • Open fuse.
  • Tripped circuit breaker.
  • Circuitry open/shorted.
  • Heater blower motor switch (18578).
  • Heater blower motor switch resistor (18591).
  • Blower motor relay.
  • Blower motor.




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Read full answer
Jan 16, 2010 • 1999 Ford Escort
8helpful
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2006 silverado 5 speed heat, the high speed is not working. I do have the 4 lower speeds
The switch, high blower speed relay or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the relay and may be the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the blower relay or wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Silverado running 100% again soon.
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Jan 07, 2010 • 2006 Chevrolet Silverado 2500HD 2WD
1helpful
2answers

Blower motor for heater only works on high....what do you think I need to change. Relay or Resistor.
If the heater only works on the high setting, your problem is the heater fan resistor, not the relay.
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Jan 07, 2010 • 2005 Jeep Wrangler
13helpful
3answers

Heater fan only works on the high position?
There is a plug up under the glove box that loosens and you need to snug it up.
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Dec 09, 2009 • 2004 GMC Canyon
0helpful
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94 roadmaste heater moter wont blow, tested motor
if the motor does't work at all then it's probably the motor,if the resister is gone you should still have high,it does'nt go through the resister.you may have a bad ground to the resister,you may need a relay.
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Sep 30, 2009 • 1994 Buick LeSabre
0helpful
2answers

Heater/ac only works on high...and on high it's extreamly noisy
sounds like relay to me but what blew it, most likely dry bearings on blower motor causing your noise clean oil fan motor install relay
Read full answer
Dec 27, 2008 • 1996 Chevrolet K1500
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