Flashpoint

98 has a locked up compressor .Question is ,I have access to plenty of like new compressors off gassers but we dont have a wider pulley unit off a diesel. If i change out the clutch assembly ,I assume it is the same compresssor right? Anyone know how many cans the system holds? or oz of 134a .Its been a while since i charged a system anyone have a idea what the high and low pressure should be?

Thanks
Jeff

paulr161

Im not sure. I do however need to chargr my system also. Do you put the gas in the high side or the low side. And witch one is witch. I have never worked on a dodge ac system before, just an old gmc.

MasseyMan1089

It should hold around 4 cans or so. Someone correct me if I'm wrong, but you put the freon in on the high side, and your vacuum pump on the low side. Get as much vacuum on the system as you can, because it prevents moisture in the system. The high side is up by next to the radiator, and the low side is down by your oil filter. The low-side draws refrigerant from the evaporator. The high-side pushes it through the a/c system. So, even if I have them backwards as far as which is high and which is low, you put the freon into the fitting closest to the radiator, and the vacuum on the one by the oil filter...

Flashpoint

Never charge your system off the high side , It can blow a can of freon up in your hand. or even worse. Usaully the high side is a smaller size line than the low side. Low side usaully has a rubber hose somewhere and the high will not. High side will be solid alum line with no rubber. The drier is on the low side i think. So if i anyone is a A/C expert please chime in.

scuzman00

NEVER NEVER NEVER charge a running system on the high side!!!!. You can pull a vacuum and charge on the low side. NEVER charge a running system by turning the refrigerant can upside down (dumping liquid into the system). Also NEVER place a can in a pot of hot water while charging (pressure increase will blow can up).

You can charge up the system by pulling a 5 micron vacuum (1.5 hrs on a tight system) on a non running (truck motor off), and dumping liquid (can upside down) into the high side (small line with small quick connect fitting). This method fills condenser with liquid and you can usually get 1.5-2 cans in before it will no longer take liquid. At this point, shut off gauge manifold valves, start engine, place A/C controls in MAX cool position, open windows and begin charging low side with gas (can in upright position. I don't have my R-134a gauges with me right now but look at the temperature scale on the low side gauge. You should be able to get the temp rating down to 28* F with the air leaving the vents at around 35-40* F. Your charge should be really close to on the mark.

I just looked on my truck and the sticker on the core support says the system holds 1.875# of 134a which equals 2.5 cans at 12 oz per can.

If you do not feel confident in attempting this, take it to a qualified shop in order to preclude any mishaps which could cause bodily injury.


Good luck!!

Gary