1999 Ford F-150 Repair Question
Engine dies at idle, and heater fan speed slows at idle. What is wrong?
check ICV valve. same as IAC. are you saying idle slows fan or fan slows idle? extra draw from alterantor does put a slightly higher load on engine. if it's too lean already this could slow down idle. idle slowing down lowers output from alternator so fan itself gets less voltage and slows down.
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