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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 07-06-2007, 12:39 PM
john_danielson john_danielson is offline
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2006 Chevy TrailBlazer LS EXT
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High Speed on Fan not working

Yesterday in the 108 degree Norcal heat, my high speed (#5) on the fan quit working. Speeds 1-4 are working fine. Do you think it could be a fuse or is there a separate blower/fan for the high speed? I have a 2006 LS TB.
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  #2  
Old 07-06-2007, 12:47 PM
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tblazed tblazed is offline
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Quote:
Originally Posted by john_danielson View Post
Yesterday in the 108 degree Norcal heat, my high speed (#5) on the fan quit working. Speeds 1-4 are working fine. Do you think it could be a fuse or is there a separate blower/fan for the high speed? I have a 2006 LS TB.
Probably #35 the blower fuse in the underhood fuse block. The blower motor gets power from that fuse only in the high "5" position.
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  #3  
Old 07-06-2007, 12:56 PM
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rbarrios rbarrios is offline
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on a road trip- my #5 stopped working so I said to myself- when I get home Ill research it on trailvoy..... Later on I happened to turn it to #5 and it started blowing again.
I did nothing to it.
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  #4  
Old 07-06-2007, 01:18 PM
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tblazed tblazed is offline
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Originally Posted by rbarrios View Post
on a road trip- my #5 stopped working so I said to myself- when I get home Ill research it on trailvoy..... Later on I happened to turn it to #5 and it started blowing again.
I did nothing to it.
I remember someone traced that problem to bad solder connections in the resistor ass'y at the relay that supplies full power to the blower. That could explain your intermittent loss of high speed 5.
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  #5  
Old 07-06-2007, 01:20 PM
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I had this problem once before. It actually remedied itself, as one day it started working again by itself.
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  #6  
Old 07-06-2007, 02:09 PM
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the roadie the roadie is offline
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Originally Posted by tblazed View Post
...resistor ass'y at the relay that supplies full power to the blower...
If you have the electronic digital climate control, the fan speed is controlled by an electronic PWM (pulse width modulation) buffer mounted to the side of the fan housing. The resistor ass'y only exists on trucks with the manual climate control. John, what version do you have?
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  #7  
Old 07-06-2007, 02:26 PM
john_danielson john_danielson is offline
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I have the manual control. When I get out of work today, I will start with the fuse and the solder connections as I have have intermittent problems. Thanks for the replies.
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  #8  
Old 07-06-2007, 05:45 PM
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in 106,000 miles- my number 5 stopped working for maybe 20 miles?... then it came back to life.
Maybe it was a solder connection? I dont know- I just know it works now.
Maybe one of those bumpy mexican roads jarred it into operation again?
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  #9  
Old 07-06-2007, 09:01 PM
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MCOMEAU334 MCOMEAU334 is offline
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My fan speed 1 wasn't working, Blower motor resistor was the problem. Simple fix. It's behind the glove box and it's about $18.00 for the part.
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  #10  
Old 07-06-2007, 09:38 PM
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ehall0527 ehall0527 is offline
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Do you have to solder the new resistor in place or does is just "come off"? I'm about to replace mine since my 1 & 2 fan speeds don't work
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