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the low side pressure is defend on the size of your ref.but if it is use in home appliance not in commercial it its range 12 psi more or less but yuo consider the cooling temp. of your suction line but if it look sweating it means your suction pressure is ok if not add refrigerant charge until it sweat.
If the compressor really has sat that long, the seals will be dry and you will not likely be able to keep R134 in it. Always fill on the low pressure side. The fittings are a different size, so your fill hose should not fit on the high pressure side. The low pressure side is along the return from the cooler.
if suction line is warm and pressure line hot . sounds like comp is trying to do its job / ck the fans and they may be slow or not going . spilling of the wine did not cause problem . .. but now is the time to correct the problem .. mm / ps if unit is running like you state the you might look at the ref charge . as it may be low . mm . hope this hs helped . feed back pls .. mm
The 1998 Dodge Caravan ac should be charged at the low pressure service port. This port is located on the suction line near the compressor. The suction line can be identified by it's size, it being the larger of the two line connected to the compressor. You must purchase a recharge kit at your local part store, which should include charging hose with pressure gauge and a can of R134a freon. Gloves and eye protection should be worn during servicing.(freon can freeze your eyes and cause frost bite to your hands). Connect freon to charging hose, connect charging hose to low pressure service port, open valves and start engine, turn on ac. If compressor won't start it may be required to disconnect the low pressure switch and jump out the connector.
You should have the manual for this unit handy and as far as recharging tools go. You only need a can of R134a *(if the unit is R12 you need to buy upgrade adapters since R12 is no longer sold) Run the unit and put the R134a filler line on the low pressure side of the compressor *(from manual...dont guess as trying to charge the high pressure side is VERY dangerous). Get the charge just into the Green zone on your charger and that is it! Try not to fill too high in the green zone....I know it sounds funny...but AC's usually work better when they have the low end of their optimum fill. R134a doesnt work as well as R12 so be sure you buy the R134a with cooling enhancers. Your local Autozone can guide you to the right filler/product combination.
DO NOT PUT 134 IN IT. If it was an original R-12 system, 134 will not work. Most all domestic refrigeration systems are sealed and have no service ports for attaching hoses for service and charging purposes. You need to find the I.D. tag. It should have all the specs on it, including how much refrigerant goes into the system. You may be able to get R-12 from an auto parts place. I've heard rumor that automotive R-12 is of lesser quality than refrigeration grade but I've found no proof. Just rumor.