1993 Toyota Pickup Truck Runs Fine Until Turn Heat On Cab Engine Temperature

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
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
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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