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very high low side reading(80) during charging of new system

miwitte on Sat March 03, 2012 7:40 PM User is offlineView users profile

Year: 2001
Make: chyrsler
Model: T&C
Engine Size: 3.8L
Refrigerant Type: 134a
Ambient Temp: 60
Pressure Low: 80
Pressure High: 80
Country of Origin: United States

Last compressor went was making a racket and when i too kit apart saw metal. So I replaced compressor, condensor, both front and rear expansion valves. Flushed remaining front and rear evaporators and hoses with DuraFlush II. Filled with 13.4 oz as per alldata. No clogs in the evaporators or hoses. I vacuumed down to 30in for a hour, it held this for 2 days so system is really tight.

So tried to charge it today, first can it took a bit and had to use some hot water to get the reading up to 40PSI before compressor kicked in. Once it kicked in things seemed to be good, can was getting nice and cold. However after a while the low side kept creaping up and eventually got up to 85 PSI high side looked about the same. One thing I noticed was that condensor was getting pretty hot fans did not kick on. It would appear at this point its not sucking because the can is about half full and doesnt appear to be sucking it in. It sounds like a clog but everything was flushed very well I am at a loss. I did notice a hissing sound at the rear expansion valve. I assume that because the low side is like 80 that why its not sucking but I dont know what would cause this.

miwitte on Sat March 03, 2012 10:15 PM User is offlineView users profile

so it looks like a condensor temp issue. I let it cool and was able to get the rest of the can in. However once the condensor started heating up the pressure went up. THe car has a fan control module and the fans arent supposed to come on until coolant temp reaches 210 or pressure reaches 250. However there appears to be a overheating issue with the condensor.

mk378 on Sun March 04, 2012 10:44 AM User is offline

High readings on the low gauge while the valve is open to charge are normal. You're just seeing the pressure in the can rather than the true pressure in the line. It can take a long time to charge out of a small can as vapor.

If your high side and low side really are the same with the compressor running, compressor is not working. Again you need to have both manifold valves closed to take pressure readings.

padgett on Sun March 04, 2012 3:54 PM User is offline

Fan(s) should be on LO any time the a/c is on. Have to maintain air flow through the condensor or it will not function.

Many Carpets

iceman2555 on Sun March 04, 2012 9:44 PM User is offlineView users profile

Noticed that nothing was said about evacuation of the system? At 60degrees it is impossible to remove moisture from the ac system without adding heat to the system. Could be that the residual moisture has resulted in a restricted orifice in the TXV. Thus the elevated temperature of the condenser. Or it could be air in the system.
One other thing...the compressor was NEVER designed to 'suck' refrigerant into the system....the system should be charged utilizing the correct equipment....period. It is almost a guarantee that this system will be undercharged and this undercharge will probably lead to a repeat compressor failure due to lack of lubricant movement in the system.
Good luck....

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

miwitte on Mon March 05, 2012 10:02 AM User is offlineView users profile

So the system was evacuated I have a nice Robinaire and was able to pull 30" for hours so the system was evacuated well. Once i got a second can in the pressure seems to have stabilized and everything looks good. I fully charged it with 46OZ as per the label. Unit is cycling nicely high side is about 110(60 degree ambient) low side about 30.

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