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A/C Clutch Cycling At Higher RPMs

EverydayDiesel on Wed May 28, 2008 12:57 AM User is offline

Year: 2001
Make: Dodge
Model: Ram Diesel
Engine Size: I6
Refrigerant Type: R134
Ambient Temp: 72
Pressure Low: 29
Pressure High: 250
Country of Origin: United States


I basically have a brand new system, everything except the evaporator core.

A/C blow 42 degrees out of the vents but when I rev the engine to 1500 rpm (diesel so its 4000 rpm max) the compressor will turn off and turn back on.
I have added 2 cans of 12oz refrigerant. System calls for 30 oz. Before I add the other 1/2 can I was curious why my high side is around 250 (at the highest) and my low side is around 30. Temperature outside was about 72 degrees
Should I keep adding even though the high side reads 250?

heres the chart i got from the factory service manual

Edited: Wed May 28, 2008 at 1:09 AM by EverydayDiesel

Chick on Wed May 28, 2008 6:46 AM User is offlineView users profile

Make sure the system capacity is in before trying to diagnose the system..Then check for anything unusual..
Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

mk378 on Wed May 28, 2008 10:11 AM User is offline

Did you start charging from a full vacuum?

You need to put the full 30 oz in regardless. It can never work properly without it.

What is the high side pressure when you rev the engine and the compressor drops out? Going up to 350 or 400? If you don't have air in the lines the problem is probably that the condenser fan is not as strong as it should be.

EverydayDiesel on Wed May 28, 2008 10:58 AM User is offline

when the compressor turns off the high side pressure starts to go down and the low side starts to climb.
250 is the highest I have ever seen it go to on the high side.

i was told just now that the pressures will read high until the fan comes on and also the oil circulates through the system(more specifically the orface tube).

Edited: Wed May 28, 2008 at 10:59 AM by EverydayDiesel

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