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Discussion Starter · #1 ·
On a rainy day withe outside temp about 50f, I was driving down the road and notice my p38 was running a little hot. As I was fumbling around with things I noticed that if I turn the windshield heater/defogger OFF my engine temp came back down to normal. I thought this was weird so I drove around testing this theory and every time even when sitting still at idle speed the engine temp would go up if the windshield heater was on and the temp would go down when the windshield heater was off.

Does anyone have any idea what could cause this to happen?

P.S. - I didn't just change the heater core and water pump, but neither one show in signs of leaking.
 
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