Why heater/defrost cools back down after vehicle stops at red light or otherwise stops for a time.

Tiny
FLEACOLLAR
  • MEMBER
  • 2007 DODGE STRATUS
  • 134,000 MILES
Heater/defrost warms up as engine does normally, but cools back down when vehicle slows or comes to a stop.
Thursday, November 17th, 2011 AT 3:06 PM

1 Reply

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
The heater works off of engine coolant which gets cooler when at idle.
The temperature is kept at operating temperture by the thermostat so it does not cool down too much at idle. More than likely you need to replace the thermostat which is probably stuck open.
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Thursday, November 17th, 2011 AT 3:48 PM

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