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99 JXI Convertible Heater Not Working

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Old Feb 9, 2016 | 06:36 PM
  #1  
Joseph Green's Avatar
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Default 99 JXI Convertible Heater Not Working

The heater on my 99 JXI will turn on hot but after a few seconds will turn cold. I can turn it off and turn it back on and will do the same thing. Replaced the thermostat and coolant and still nothing. Any ideas?
 
Old Feb 10, 2016 | 11:17 AM
  #2  
dcotter0579's Avatar
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From: Detroit suburb
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Check the operation of the blend door. It's a flapper inside the heater plenum that controls temperature by adjusting the mix of hot and cold air coming in.
 
Old Feb 10, 2016 | 04:17 PM
  #3  
CHRYSLER TECH's Avatar
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From: Norcross GA
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sounds like a heat core clogged up. Warm engine up feel both the hoses going into the fire wall they need to feel hot where you can not touch them.
 
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