Defroster issue
Thread Starter
Junior Member
Joined: Oct 2013
Posts: 13
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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
Senior Member
Joined: Jul 2007
Posts: 3,805
Likes: 480
From: Cape Girardeau MO
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.