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2001 Dodge Ram 5.9L A/C Issue

rljt60 on Thu May 14, 2009 10:44 PM User is offline

Year: 2001
Make: Dodge
Model: RAM
Engine Size: 5.9
Refrigerant Type: R134A
Ambient Temp: 90

Friend’s wife complained A/C dies five minutes out from house. Hooked up gauges and A/C runs fine at idle. Raised RPM to 1700 and low pressure side dropped to 20psi and compressor clutch released and did not re-engage. Symptom of low R134A. Then discovered Hi pressure side schrader valve was steadily leaking gas. Didn’t notice any oil or residue around the valve. Replaced valve and vacuumed system.

Due to math error on my part I probably overcharged system but later bled off some gas. Now, start the car and at idle have 30psi low and 230 hi. A/C runs fine at idle for extended period (~10 minutes) but when raise RPM to 1700 low side drops to 20psi and compressor cuts out. Then psi rises to around 70 (trying to balance with hi side) and compressor kicks back in and runs fine. Hi side psi is around 225. Sounds like it is working right.

But, then turn car off and wait one to five minutes and turn it back on again and A/C will not start up again. Have to wait 15 minutes or so before A/C will start to work again. Balanced pressures are 70 to 90 depending on how much gas I bled off but symptoms are the same. No additives other than Dupont 134A have been added to the system. Doors and windows are open, max blast, and 90 degree ambient
and 60% humidity. Any suggestions?
Many thanks, Bill

Chick on Thu May 14, 2009 11:28 PM User is offlineView users profile

Van or full size pickup?? Chrysler uses Ram on everything.. anyway, it does this more when hot I guess? If so, when it fails to start up again, tap the outer hub on the compressor inwards..If it grabs and starts turning, adjust your clutch gap..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Fri May 15, 2009 7:43 AM User is offline

Ditto on the hub tapping-- seen a few Dodges do this--especially higher mileage ones......

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

rljt60 on Thu June 18, 2009 7:02 PM User is offline

Hi All,
It's a full size pick-up and after I made that last post it started working. I appologize for not getting back with info earlier but finally found a job. However, now the A/C is failing to start again. Like you suggested, a tap on the clutch causes it to fire right up. So my next question is 'how do you adjust the contacts?'. Is that a shim issue? Or, is there some mechanical adjustment I need to know about? Or, would you recommend just buying a new clutch for the compressor?
Many thanks, Clark

GM Tech on Thu June 18, 2009 7:35 PM User is offline

Pull the clutch hub off- remove a shim and re-assemble be careful not to drop a shim when you remove clutch

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Chick on Thu June 18, 2009 7:42 PM User is offlineView users profile

This is a ford FS10, but the principal is the same on your Sanden, as GM tech said, be carful when you slide it off, sometimes the shim will stick to the shaft, or fall.. hope this helps..



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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

rljt60 on Mon June 22, 2009 12:46 PM User is offline

Many thanks folks. Whenever I see the truck next I'll give it a try. I'll let you know how the fiasco turns out. Thanks again, Bill

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