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Old Jun 6, 2014 | 10:17 AM
  #1  
new7.3owner's Avatar
new7.3owner
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heater motor

My heater motor only works on high I put a different control switch in it that I know is good and the lower speeds still dont work only high speed works
 
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Old Jun 6, 2014 | 10:22 AM
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From: Pecatonica, IL
Originally Posted by new7.3owner
My heater motor only works on high I put a different control switch in it that I know is good and the lower speeds still dont work only high speed works
Most likley your blower motor resistor, its located next to the blower motor under the hood. Ususally when they go bad you start loosing speeds.
 
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Old Jun 6, 2014 | 11:29 AM
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X2^^^^^^^^^^^
 
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Old Jun 6, 2014 | 12:21 PM
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X3 - High speed bypasses the resistor block, so that's a dead giveaway that it's failed.
 
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