No AC refrigerant in 1995 E250

You can not buy R12 Refrigerant, for the last
15 years or more,so you have to convert to R134a

The low side port is the larger of the two & the one
closet to the evaporator near the firewall or on suction
side of the compressor

Use Google or You Tube Video for Pic

You need 22oz for a "front only" a/c system and 32oz of R-134a refrigerant for "front and rear" a/c system.

The compressor is off likely due to insufficient refrigerant charge in the system. Once the minimum required charge has be provided, the compressor clutch should engage (check for blown fuse if it does not). Refrigerant is added only to the low or suction side of the compressor and only as a gas. Do not invert the refrigerant tank in an attempt to add refrigerant as a liquid! Placing the tank in warm water is a better way to fill the system (raises the pressure in the tank) without concern for slugging the compressor.

refrigerant added is by allowing the compressor to suck it in (low pressure side or suction side )until the system pressures are right
What you describe is liquid getting into the compressor causing the high pressure switch to shut it down until the liquid boils off

Your have a low refrigerant level. Econ staying on and service ac will stay on too. Sounds like you didnt put enough r134a in the system. How much r134a did you add? Capacity is 38 ounces(thats
with R12), and a bit less than that for r134a.

Yes, if it is like my 1990 cadillac deville, you must first disconnect the battery for 3 or so minutes and reconnect it to clear the error message and to reset the a/c system so it will turn on when R134a is added under pressure.

Cadillac did that in 1990 so the compressor would not run without refrigerant in the system. It's a safety feature designed to save a compressor if there is a leak in the system.

If you try to add refrigerant without resetting the a/c system, then the compressor will not engage.
.

The ac system may need freon added,if the system is low,or out of freon,it will not allow the ac compressor to come on.

RECHARGING AC SYSTEM

1.Turn the truck on and turn AC on HIGH
2.Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
3.Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
4.Insert the other end of the refill hose to the low side valve
5.Puncture the R-134A can with the screw on the refill hose
6.You should feel the system suction the refrigerant out of the can
7.Check for frost on the AC lines and the air blowing inside the truck
8.If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.

In most cases, the problem is the system is low on refrigerant. The AC compressor requires a minimum of 20psi of refrigerant to turn on. There are refill kits available at the auto parts stores. If doing this yourself, select a kit that includes compressor oil, and a refill hose.

RECHARGING AC SYSTEM

1. Turn the truck on and turn AC on HIGH
2. Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
3. Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
4. Insert the other end of the refill hose to the low side valve
5. Puncture the R-134A can with the screw on the refill hose
6. You should feel the system suction the refrigerant out of the can
7. Check for frost on the AC lines and the air blowing inside the truck
8. If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective

Hopefully this answers your question and you're able to get your AC working again. Best of luck.
Greg

yes it uses r134 a port located on left side top of car front view by the window washer fluid plug is blck unscrew plug add r134a while car is on and ac is on

The Compressor will need to be retrofited by an EPA class II refrigeration technician this can be easily done by an ac shop as the oils in the two systems are not compatible and, the fittings must be changed to accept only r-134-a test gauge hoses