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high pressures on both sides

arslanian29 on Sun July 13, 2008 10:39 AM User is offlineView users profile

Year: 98
Make: jeep
Model: grand cherokee
Engine Size: 4.0
Refrigerant Type: 134
Ambient Temp: 85
Pressure Low: 80
Pressure High: 325
Country of Origin: United States

i am an autobodyman man and i charge ac's all the time, but my wifes jeeps ac was a liitle weak so i sucked it down and charged it. it reads 325 on the high side and 80 on the low. it wont cycle unless i unplug the fan motor, then the low drops to 23-25 and it will cycle. i charged it twice to see if i did something wrong and it has the correct amount of freon. i also flushed the condensor out with some brake cleaner and compressed air. it didnt seem to have any restrictions. help, i don't want to throw alot of money in parts at this car .

bohica2xo on Sun July 13, 2008 11:21 AM User is offline

You have almost no capacity.

The low side falls into line with no cooling load, so the TXV is OK.

Either a restriction in the lines, receiver/dryer or condensor. My bet is the condensor.

Your condensor has several tiny parallel paths for refrigerant, and can pass small volumes of compressed air easily, even if several passages are blocked or crushed. The air side of that condensor is also sensitive to dirt, bugs, paint, etc. - it has fine, dense fins.

Hose the condensor down, and see if the low side drops. If it does not fall, then check the receiver dryer.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Dougflas on Sun July 13, 2008 11:24 AM User is offline

Trysoraying the condenser with a water hose. If the pressures have condenser airflow problems. Are you sure your charging equip. is measuring the correct charge? It appears you either have condenser airflow or overcharge problem.

arslanian29 on Sun July 13, 2008 11:29 AM User is offlineView users profile

thanks i will try that and post what happens

chris142 on Sun July 13, 2008 12:35 PM User is offline

I had a Caddy in last Friday that was doing some strange things. Condensor looked clean untill you got down low and really looked through it then you could see all the sand and bugs.

I blew it out with our steamer and it fixed it.

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