Heater Switch

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  #1  
Old 01-28-07, 05:30 PM
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Heater Switch

I replace the heater switched on my 90 Safari because the contacts were burnt. A couple of days ago i went to turn the heat on and it wasn't working. Does anyone know what would cause it to burn the contacts out like that?
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  #2  
Old 01-28-07, 05:32 PM
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Sounds like you have a bad ground or hot wire somewhere allowing to much voltage.

Are the new switch contacts burnt up as well?
 
  #3  
Old 01-28-07, 06:17 PM
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yes the new switch is burnt. a friend of mine told me to put resistors on the wires to prevent the contacts from being burnt...it doesn't sound like a good idea but i could be wrong...i don't plan on having the van for to much longer but i would like to have heat while i still have it
 
  #4  
Old 01-28-07, 06:24 PM
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Fan motor probably on its way out and drawing too much current (although I would have thought the fuse would blow first; did you replace a fuse with one of a higher rating for this circuit?).
 
  #5  
Old 01-28-07, 06:35 PM
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On the beam Bob..........Check the resistence in the blower motor. Also check the resister block that gives the motor its different speeds. If it keeps smoking switches the block oughta be toasted too..........One other thing........Make sure the contacts at the switch are clean and tight......After one smokes, the wires and connector get pretty ugly
 
  #6  
Old 01-28-07, 09:32 PM
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you usually have to replace the switch connector and terminals to get a good connection they are available from gm as it is a common problem on that style of blower switch.
 
  #7  
Old 01-29-07, 05:39 AM
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thanks for all the help guys...when i replace the switch i will put new contacts on and see if that helps...thanks again everyone
 
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