heat hand rising and falling

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  #1  
Old 04-15-07, 11:36 AM
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Join Date: Apr 2007
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Unhappy heat hand rising and falling

i have a gmc truck and the heat dial keeps going from 150 deg. to 210 deg.. what is causing this? I thought maybe the a sticking thermostat?????.please help
 
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  #2  
Old 04-15-07, 05:23 PM
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Welcome to the diy forums!

It might be the thermostat, it also could be faulty wiring or gauge. 150` is awfully cold for running conditions.
 
  #3  
Old 04-23-07, 05:58 PM
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heat gauge

what year is your truck what engine does it have?
 
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