A/C Compressor - Ford Powerstroke Diesel Forum
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Old 04-09-2007, 04:26 PM
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A/C Compressor

Ok yall I got something for you to help me figure out. No matter what position my heat control switch is in. Even if it is of the A/C Compressor Clutch still engages and disengages. I have no idea why. If the heat control switch is in the off position, the a/c compressor clutch should not do anything at all. My a/c and defrost work great but why is the clutch engaging and disengaging all the time when the truck is running.
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Old 04-09-2007, 04:27 PM
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Good question! My 99 ranger used to do that all the time, so will be interested in the answer
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Old 04-10-2007, 10:56 AM
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Not sure just why that is either, both my Fords are the same way...if the switch is on, regardless whether or not it is for the heat or a/c, it seems the a/c compressor is on as well. Annoying almost to the point of thinking about installing a seperate switch just for the a/c. I know that running the a/c does have a slight effect on mileage, but if ya don't need the a/c, ya might want that "slight" difference in mileage...I would..
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Old 04-10-2007, 03:25 PM
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all the car lines do that in one way or an other because in the winter months aka " don't need to be cold " they do this thur the PCM so the refrigant gets cycled so moisture doesn't build up in the system . also there normally pcm monitors the air time so can have a/c then its blow like 38 F .
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Old 04-10-2007, 07:30 PM
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Quote:
Originally Posted by howardtm View Post
Not sure just why that is either, both my Fords are the same way...if the switch is on, regardless whether or not it is for the heat or a/c, it seems the a/c compressor is on as well. Annoying almost to the point of thinking about installing a seperate switch just for the a/c. I know that running the a/c does have a slight effect on mileage, but if ya don't need the a/c, ya might want that "slight" difference in mileage...I would..

I am with you on this. It is annoying as heck. Especially when you trying to listen for something that might be going on with the engine and you hear the dang a/c clutch engaging and disengaging all the time. I don't remember if it did it when it was new or not. I am just trying to find out if there is a problem with my truck if so I would like to fix it.
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Old 04-11-2007, 03:25 PM
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see if this helps with the sequence of operation

Jim
Manual 2002 System Airflow Description.doc
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Old 04-11-2007, 03:33 PM
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You will notice that there are two type systems in these sheets.
The manual system and the Electronic Aotomatic Temperature Control or EATC type system

Jim
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Old 04-11-2007, 03:35 PM
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sorry for the typo in "Automatic"
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Old 04-11-2007, 03:36 PM
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Quote:
Originally Posted by gbear View Post
You will notice that there are two type systems in these sheets.
The manual system and the Electronic Aotomatic Temperature Control or EATC type system

Jim
That is good info but it does not explain how to fix my problem with my a/c compressor running when the heat control selector switch is in the off position.
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