Defroster issue
11-10-2013, 01:06 PM
#1
Defroster issue
Hi,
My truck is a 1989 F150 with a 4.9L I6. On Thursday morning, I kicked on the defroster and the idle started fluctuating from normal to low until it died. Just with defrost, not with heat. I ran the AC thinking it might be a compressor issue but it ran normally. Could it be in the switch? Anybody have any ideas?
Mike
My truck is a 1989 F150 with a 4.9L I6. On Thursday morning, I kicked on the defroster and the idle started fluctuating from normal to low until it died. Just with defrost, not with heat. I ran the AC thinking it might be a compressor issue but it ran normally. Could it be in the switch? Anybody have any ideas?
Mike
11-10-2013, 04:59 PM
#2
Senior Member
Mine has occasional bouts on cold weather starts with the idle issue you describe. Things seem to mostly clear up after an IAC solenoid cleaning. Otherwise, I keep my foot on the pedal maintaining the fast idle for about 30 seconds until things seem to settle out.