1998 Dodge Truck heater

Tiny
REDROBIN713
  • MEMBER
  • 1998 DODGE TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 157,000 MILES
The heater will blow hot when at idle but when driving the heater gets cold
Sunday, December 27th, 2009 AT 3:21 PM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
A few different things can cause this. Faulty coolant mix or low coolant level, faulty thermostat and clogged heater core are the most common. Best place to start is by checking the coolant level and coolant mixture. If OK, remove the thermostat and test it. If working properly, flush the heater core out.
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Sunday, December 27th, 2009 AT 3:40 PM

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