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az supporter
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Post Posted: Thu Mar 24, 2011 6:35 am 
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Hello,

This morning I thought I'd test out the Sierra heating.
In doing so I noticed that the fan only works on high speed.
Low and Medium do nothing. What causes this? And how do I fix it?

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Joined: Wed May 27, 2009 11:30 pm
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Location: Fremantle, WA
Vehicle: '85 Sierra LWB Ute, Lkd 33's

Post Posted: Thu Mar 24, 2011 6:40 am 
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sounds like the resistor coil inside the heater box has failed.... find anotehr one would be my guess

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az supporter
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Post Posted: Thu Mar 24, 2011 7:06 am 
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When you say heater box you mean the fan box or the box the controls are in?

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az supporter
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Post Posted: Fri Mar 25, 2011 12:02 am 
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Anyone else able to help?

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az supporter
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Post Posted: Fri Mar 25, 2011 12:03 am 
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My fan switch carked it in Suz. The wires rattled loose. All i did was re- solder them. Good as new.

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omnipotent being
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Post Posted: Fri Mar 25, 2011 12:04 am 
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on the side of the heater there is a little metal plate held in by 2 screws and has some wires plugged into it, unscrew it and pull it out for a look, you might find the bimetallic strip is dirty

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