Ford Truck Enthusiasts Forums
Older, Classic & Antique Trucks
1987 - 1996 F150 & Larger F-Series Trucks
What could it be?

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

What could it be?

Reply Subscribe

Search this Thread

Old

Feb 4, 2008 | 10:50 AM

#1

dep295

Thread Starter

|

New User

Joined: Nov 2007

Posts: 7

Likes: 0

What could it be?

What could be wrong with my 89 F-150 with a 4.9l engine? Ever time I turn on the a.c. or the defroster it starts to idle up and down and chokes down. If I turn off the a.c. or defroster it will idle normal. I replaced the i.a.c. valve but it didn't help any. No one I talk to seems to have any idea what it could be. I know some of you will know what could be wrong with it.

Reply

Old

Feb 4, 2008 | 10:55 AM

#2

tfowler306

Senior User

Joined: May 2004

Posts: 194

Likes: 1

From: Waterford Michigan

It could be your compresor is going bad. Unplug the compressor and then try the defroster agian. see if this allows the truck to idle normally.

Reply

Old

Feb 4, 2008 | 12:07 PM

#3

95F350XL

Posting Guru

Joined: Aug 2007

Posts: 2,026

Likes: 0

From: Belle Mead NJ

Ill 2nd that. As the only thing different from normal engine opp, when the AC and defrost is on, is the AC Compressor.

Reply

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last

All times are GMT -5. The time now is 11:28 PM.