1993 TOYOTA PICKUP
150,000 MILES
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DGKEMM1
  • MEMBER
  • 1 POST
My truck runs fine until i turn the heat on in the cab then the engine temperature goes up. What causes this
Dec 19, 2012 at 3:35 PM
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KHLOW2008
  • CAR REPAIR CONTRIBUTOR
  • 41,814 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.
Dec 19, 2012 at 5:38 PM
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