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No heat

Tiny
77MARINE85
  • MEMBER
  • 1996 DODGE RAM
  • 5.9L
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
I have a Cummins. Change heater core no heat. Installed flush t and flushed no heat. Not over heating. Thermostat is working as well as the water pump. AC works. By pass door works. Read that the AC/heater fan switch could be the culprit, because it actuates the AC compressor and a motor that switch air from heat to the evaporator. I do not know how to test the switch. Any thoughts would be appreciated. Driving around with a propane heater is getting old.
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Thursday, February 9th, 2017 AT 2:05 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I am assuming you mean no heat in truck. First check cable for blend door to see if it is broken or not operating the blend door so you can get heat.
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Friday, February 10th, 2017 AT 7:34 AM

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