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Troubleshooting a Truck Heater?

My 2014 Dodge 1500 heater and thermostat are crazy. Why does the temperature gauge stay on cold after the temp outside is below -19, but after running the truck for 20 minutes and shutting it off the heater and gauge work properly. It has gone to the dealership several times and they can't figure it out.

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Gold Post Medal for All Time! 677 Posts
October 1, 20170 found this helpful

Here are some reasons your heater may not be working properly

  • Low coolant level on a vehicle due to a coolant leak.
  • Thermostat that is stuck open.
  • Plugged or leaking heater core.
  • Heater blower that is not functioning.
  • Blend doors that are not functioning
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