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F250 air conditioning comes and goes UPDATE I think I fixed it!

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F250 air conditioning comes and goes UPDATE I think I fixed it!

Old 06-29-2011, 11:56 AM
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Default F250 air conditioning comes and goes UPDATE I think I fixed it!

2002 Ford F250 220,000 miles. The air conditioning will work fine most of the time but occasionally it loses it. If I floor it, it will come back. Do I need more freon?

Last edited by mfav; 07-26-2011 at 10:26 AM.
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Old 06-29-2011, 12:11 PM
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More than likely the o-ring in the head unit that controls the gates or doors in the a/c system is dry and cracking. When the o-ring doesn't seal right the door that sends the a/c thru the dash doesn't close and the a/c hits the floor instead. I had the same issue on my 2003 F-150. Dealer wanted nearly $700 for an entire new head unit. I found a thread on one of the Ford enthusiast sites that explained how to do it yourself. Took about an hour from start to finish and cost 18 cents for the 0-ring. I'll see if I can find the link for you.

Here's one link, but there are many others.

http://www.f150online.com/forums/hva...buildable.html
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Old 06-29-2011, 12:19 PM
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Originally Posted by mfav View Post
2002 Ford F250 220,000 miles. The air conditioning will work fine most of the time but occasionally it loses it. If I floor it, it will come back. Do I need more freon?
My 01' F250 did the same thing except with heat at around 170k. Hit the gas hard and it would start working for a little while but then would quit completely sitting at a stop light???? Ended up getting rid of mine before I took it in to get it fixed.
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Old 06-29-2011, 12:23 PM
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It is most likely from clutch wear on the AC compressor. There is a small washer that can be removed, which will re-set your air gap in the clutch closer to OEM spec. You will likely need a ford tech to do the fix. It's fairly common. My guy charged me $80 to do it.


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Old 06-29-2011, 01:00 PM
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The question is, does the a/c actually stop blowing cold or does it just blow cold out another vent? If it stops blowing cold, that's a compressor issue. If it still blows cold, but comes out the floor or defrost vent, its a vacuum issue.
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Old 06-29-2011, 01:29 PM
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It stops blowing cold. If I mash on the accelerator it comes back.
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Old 06-29-2011, 06:43 PM
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Originally Posted by JayLeto View Post
It is most likely from clutch wear on the AC compressor. There is a small washer that can be removed, which will re-set your air gap in the clutch closer to OEM spec. You will likely need a ford tech to do the fix. It's fairly common. My guy charged me $80 to do it.


Jay
Sounds like this may be his issue. When you floor it the compressor is commanded off and then back on when you let off the throttle. many times this cycling will cause it to re-engage again for a little while. I guess I need to charge more as I normally will re-shim most compressors as a courtesy to my customers. Most of the time it only takes 5 minutes or so to re-shim a compressor if your doing something else at the same time.
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Old 06-29-2011, 06:49 PM
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May also be the clutch fan on the truck itself. My GMC (163,000 miles) started doing this but the truck did not run hot. It just did not move enough air at idle to flow over condenser.
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Old 06-29-2011, 07:00 PM
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Originally Posted by mfav View Post
It stops blowing cold. If I mash on the accelerator it comes back.
What about a loose wire to the fan.
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Old 06-30-2011, 05:11 AM
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Originally Posted by 101grunts View Post
What about a loose wire to the fan.
The fan blows, just not cold.
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Old 06-30-2011, 07:30 AM
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Originally Posted by mfav View Post
The fan blows, just not cold.
When it does this stop and see if the compressor is turning or not. If it isn't turning take a screwdriver something like that and give the compressor clutch a slight touch and see if it engages. If it does then it needs re-shimmed.
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Old 06-30-2011, 07:56 AM
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Originally Posted by G8RDave View Post
More than likely the o-ring in the head unit that controls the gates or doors in the a/c system is dry and cracking. When the o-ring doesn't seal right the door that sends the a/c thru the dash doesn't close and the a/c hits the floor instead.

http://www.f150online.com/forums/hva...buildable.html

My dodge doese this if pulling. Heavy load up a hill
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Old 06-30-2011, 01:47 PM
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Check the charge... Common this time of year for systems to start failing. Guy at work had the same problem 2 weeks ago. His was just a charge up.
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Old 06-30-2011, 03:39 PM
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Originally Posted by G8RDave View Post
The question is, does the a/c actually stop blowing cold or does it just blow cold out another vent? If it stops blowing cold, that's a compressor issue. If it still blows cold, but comes out the floor or defrost vent, its a vacuum issue.
My F250 just started blowing out the defrost vents sometimes.
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Old 06-30-2011, 06:39 PM
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You need a new compressor clutch.Check out ford-trucks.com.
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Old 07-01-2011, 07:12 AM
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Default A/c

I had a similar symptoms an ended up having 2 issues. If the shims wear out in the ac clutch assembly it will not stay engaged at low rpm. An easy fix is to remove a shim, if the field coil is weak you will need a new clutch. Also if it is a 4x4 model you could be losing vaccum at the 4x4 module and you heater valve could open and at low rpm your ac can not handle the added heat from the heater core. With the engine running check to see if the valve to your heater core is shut. Its a black plastic valve on the upper passenger side with a vaccum tube connected to it.
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Old 07-04-2011, 04:47 AM
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My 2000 did the same thing, needed to be shimmed, took a guy at work a few minutes and has been fine ever since. this was about two years ago.
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Old 07-05-2011, 02:46 AM
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Had a Taurus do this. It was the blending door. Mine was located under the dash in an access panel through the glove box. The shop thought it was my compressor clutch, then electrical (relay, switches) etc... They replaced all of it and it still did not work. They then diagnosed the blending door. Correctly I might add.

Now, the clutch and all was bad, at least that is what they told me.... Hmmmm... But after they replaced that blending door, it would hang ice off of the tip of your nose like it used to.
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Old 07-09-2011, 04:29 PM
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Stumbled across this the other day. My 02 f250 was doing the same. Pulled off clutch, removed washer and its cool again.

Thanks for posting.

I couldn't find any feeler gauges so I just did it. I can say though that I still have what appears to be substantially more than an .020 gap, but it works and that's what counts. I suspect it won't be long before I'll have to change the clutch.
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Old 07-25-2011, 11:13 AM
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With all the increased heat we have had I finally took it to a mechanic. Wouldn't you know, it never failed for him!

Think I'll remove the washer myself and see what happens.......
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