Heater grids
#1
Heater grids
does anyone know if the heater grids can go bad or are there any solenoids that go bad, mine come on when its 90 degrees out, I can tell because when I start the truck my batteries drain down and I can see my rpm's go up and down . I disconnected them and i have no problem, but it's gonna get cold soon .
#3
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A IAT sensor reporting cold temp will make cycle on. Follow the wiring back from manifold and you will find two heavy duty relays that control current to heaters. The relays are controlled by PCM, based on ambient, coolant and IAT.
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