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A.C. problems w/ 2002 F-350 Pages: 12

mustangvirgil on Wed April 08, 2009 5:22 PM User is offline

Year: 2002
Make: Ford
Model: F-350
Engine Size: 7.3
Refrigerant Type: r134a
Country of Origin: United States

can anyone out there help me solve this problem: my a/c works fine at idle but while driving a/c stops cooling. i thought orfice tube was clogged but i changed that & also changed the dryer but w/ no luck. i also changed both clutch cycling switches and that also did not work. i'm at a loss here & would appreciate any advice.

thanks in advance,
virgil

JACK ADAMS on Wed April 08, 2009 5:50 PM User is offline

First off, did you evacuate the system before re-charging the system? Next try crimping off the heater hoses that lead to the heater core. You may also try to look for a Vacuum leak. If I’m not mistaken if this is a 4X4 you will have vacuum lines going to the front spindle hubs. These vacuum lines all tie into the a/c vacuum lines as well. Make sure all lines are in good condition. Heat here in Arizona is a killer on those plastic lines.

Hope this helps and good luck!!

Chick on Wed April 08, 2009 5:51 PM User is offlineView users profile

While stopped, try reving the engine and watch the compressor, see if the clutch stops turning. If it does, it may be a clutch gap adjustment. Should be around .02, or a business card should fit snuggly in the opening between the pulley and the outer hub..Let us know what you find.. Hope this helps.

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Wed April 08, 2009 5:52 PM User is offlineView users profile

Quote
Originally posted by: JACK ADAMS
First off, did you evacuate the system before re-charging the system? Next try crimping off the heater hoses that lead to the heater core. You may also try to look for a Vacuum leak. If I’m not mistaken if this is a 4X4 you will have vacuum lines going to the front spindle hubs. These vacuum lines all tie into the a/c vacuum lines as well. Make sure all lines are in good condition. Heat here in Arizona is a killer on those plastic lines.



Hope this helps and good luck!!

Hey Jack, you have heat in AZ?? We had snow flurries twice today, I am beginning to think summer will never get here..


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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mustangvirgil on Wed April 08, 2009 6:05 PM User is offline

thanks for your quick response, much appreciated. yes i did evacuate first. i've also tried crimping off the heater hose as well, still didn't help. when i rev the engine up to 2000 rpm's the clutch does disengage. as far as the vaccum is concerned & i've checked all lines...still no luck there either. btw, it's diesel & 2 wheel drive. when i bring up the rpm's it acts like it's building up to much head pressure.

Chick on Wed April 08, 2009 6:14 PM User is offlineView users profile

Check the clutch gap, when it's to wide the coil can't hold it in.. It should have shims, and you can remove one to get the proper gap. A weak coil could also do it, if adjusting the gap doesn't do it, then check for three to four ohms at the coil.. Hope this helps.

Here is a pic of the shim(s) I have better pics, just can't find them right now, if this doesn't explain it, i'll look for the other..Good luck



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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

JACK ADAMS on Wed April 08, 2009 6:19 PM User is offline

Can you give us pressure readings, Hi and Low at idle and at 1800rpms?

Chick,

we have had some nice weather with exception of some windy days, but other than that it has been so nice….

Chick on Wed April 08, 2009 6:19 PM User is offlineView users profile

Here is a better pic, put the shim in the outer pulley, and be careful when you slide it off that you don't drop any. Sometimes one will stick to the shaft like in the first pic.. and you have to watch it doesn't fall.. Hope this helps..

Hey Jack, this "spring" has been way off, you don't know how to leave the house in the mornings.. Today we had to snow flurrys lasting about an hour each..Geezzz.. I want heat!!!.



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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Wed April 08, 2009 at 6:22 PM by Chick

dasinc on Wed April 08, 2009 6:22 PM User is offlineView users profile

Do you know what you are running for pressures? That's going to be the place to start. Changing the switches isn't going to do anything for you if the pressures aren't correct. Being as the engine RPM's affect it, it either has to be a pressure issue or it could even be a runability issue where the BCM is shuuting down the air to take the load off of the system. My guess would be it's most likely a pressure issue. Hook up the gauges and read the pressures as you increase RPM's and let us know what happens.

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Take care,

Travis

[email protected]

mustangvirgil on Wed April 08, 2009 6:51 PM User is offline

hey guys!
with the engine off, the low side rides 98psi, same w/ the high side. engine running at idle is 35psi on the low side and 150psi on the high side. when bringing the rpm's to 1500 the gauge just starts to move & the clutch disengages. and the clutch coil ohm's out at .003.

thanks again for the help. truly appreciated. keep the suggestions coming, please. i know i can figure this out w/ some help.

Chick on Wed April 08, 2009 6:55 PM User is offlineView users profile

Did you check the gap? here's a pic on how. This is a GM compressor, but the principal is the same.. Your .003 ohms might be 3 ohms, just on the wrong setting, I doubt it would grab at all at that setting.. Your pressures with the engine off are high because obviously the engine compartment is hot. The running pressures look fine so it's either the clutch gap (common on fords) or a weak coil in my opinion....
hope this helps..






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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Wed April 08, 2009 at 6:59 PM by Chick

mustangvirgil on Wed April 08, 2009 7:00 PM User is offline

the outer ring i can fit 4 business cards in & the inner i can fit 3 easily.

Chick on Wed April 08, 2009 7:05 PM User is offlineView users profile

Not sure what you mean by inner or outer rings, but as you can see in the pic,(ford won't have the openings in the outer hub like the GM shown) the outer plate and pulley should fit one snuggly.. Take the nut out of the center and slide the plate off and see how many shims are in there, adjust til it's close, about .02 without touching and you should be fine..let us know how you make out..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mustangvirgil on Wed April 08, 2009 7:11 PM User is offline

gotta run. the job is calling me, i'm a diesel mechanic/on road service of rigs around the houston area. i will be back on either later tonight or tomorrow afternoon. keep the suggestions coming.

thanks again,
virgil

mustangvirgil on Wed April 08, 2009 9:07 PM User is offline

to the person who recommended removing the shim..... you are a genius!!

this is mustangvirgil's wife & he just called & asked that i get on here & post the good news that removing the shim worked! yea!! a/c is working once again. thank you for all of your help. we really appreciate it. he's been driving his truck w/ no a/c for a year (thru texas' sweltering summers) and has thrown a lot of money at the problem w/ no luck until today when you recommended removing the shim. now his summer will be much more enjoyable.

thanks again & have a great evening.
lisa

Chick on Wed April 08, 2009 9:10 PM User is offlineView users profile

Glad we could help, he found the best AC help board on the internet.. Tell him to stay cool..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

JACK ADAMS on Thu April 09, 2009 11:22 AM User is offline

Each business card is about 10 thousands, so you could have had about 30 thousands in the clutch gap. Real common for a diesel engine. Back in the day we used a match book cover to set distributer points on the road when we didn’t have a feeler gauge.

Well Chick you nailed it! Good job!!

Chick on Thu April 09, 2009 2:41 PM User is offlineView users profile

Yeah, I remember setting points with a match book cover, and setting dual points by sticking a match cover in one set while you did the dwell on the other.. The good old days...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

TRB on Thu April 09, 2009 2:48 PM User is offlineView users profile

I can understand someone like Chick saying the good olé days. But Jack come on, he not old just abused!

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

Chick on Thu April 09, 2009 2:56 PM User is offlineView users profile

Hah Tim, maybe he was just a young guy with "old" cars...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

JACK ADAMS on Thu April 09, 2009 2:59 PM User is offline

It never fails Tim has to bust something, never said “Old Days” I said “Back in the day”.

TRB on Thu April 09, 2009 3:02 PM User is offlineView users profile

Quote
Originally posted by: JACK ADAMS
It never fails Tim has to bust something, never said “Old Days” I said “Back in the day”.

I'm just happy you're answering the posts and not playing on the Internet looking for ammo!



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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

JACK ADAMS on Thu April 09, 2009 3:09 PM User is offline

Did that lastnight!!!

mustangvirgil on Thu April 09, 2009 3:43 PM User is offline


i was just reading y'alls post & laughing...i just set the points on my mustang with a matchbook. hahaha

Hope you don't mind but I resized it and posted it for you Virgil.. You do know your hood is missing, right??



Edited: Thu April 09, 2009 at 4:02 PM by Automotive Air Conditioning Information Moderator

mustangvirgil on Thu April 09, 2009 3:44 PM User is offline

well i tried uploading a picture but i guess i did it wrong.

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