My truck runs fine until I turn the heat on in.

Tiny
DGKEMM1
  • MEMBER
  • 1993 TOYOTA PICKUP
  • 150,000 MILES
My truck runs fine until I turn the heat on in the cab then the engine temperature goes up. What causes this
Wednesday, December 19th, 2012 AT 3:35 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Therotically when heater is turned on, the temperture should drop as the blower motor fan is helping to reduce coolant temperature. The problem is most likely to be a faulty reading which is most likely be due to a poor ground circuit.
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Wednesday, December 19th, 2012 AT 5:38 PM

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