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Can someone help me make sense of this? I would start to diagnose the problem, except I don't know where to start! None of this is logical, unless the HVAC system on this trooper is different from any I've seen before.
So my problem is, whenever I turn my fan on, my idle drops. At a stoplight it feels like the truck will shut off, the rpm drops below 1000, then I switch the fan off and the idle goes up to normal. Whatever setting the vent switch is on doesn't seem to matter, although I usually keep it on defrost.
So what's the deal here? I know my alternator and battery are good, and the fan works fine on all three speeds. No other electrical problems that I am aware of, and the truck runs fine other than the cold start valve still being broken.
So my problem is, whenever I turn my fan on, my idle drops. At a stoplight it feels like the truck will shut off, the rpm drops below 1000, then I switch the fan off and the idle goes up to normal. Whatever setting the vent switch is on doesn't seem to matter, although I usually keep it on defrost.
So what's the deal here? I know my alternator and battery are good, and the fan works fine on all three speeds. No other electrical problems that I am aware of, and the truck runs fine other than the cold start valve still being broken.