None. All cars produced after 1994 use r134a in their a/c systems instead of r-12 (freon). Your car should have a sticker under the hood somewhere that details the amount of refrigerant in the system, although when you charge an ac system you are not measuring the amount of refrigerant, but rather the pressure. You can get a can of r134a and a reusable charging manifold at a car parts store for about 20 dollars to fill your a/c system up to the correct pressure. It may take anywhere from half a can to a few cans depending on how low on refrigerant your system is.
It takes R-134a. Good luck.
low on freon compressor kicking in and out
R134a
Check the Freon with a gauge. If the pressure is too high or too low then the system will not allow the compressor to run.
Was built for R12, should be converted to R134a
Was built for R12, should be converted to R134a
To add Freon to a 2000 Mercury Grand Marquis, locate the low-pressure service port on the AC system, which is typically found near the accumulator or the firewall. Remove the cap from the service port, attach the refrigerant gauge and hose, and then add the appropriate type of refrigerant. Be sure to check the system pressure with the gauge to avoid overcharging. Always follow safety precautions and consult the vehicle's manual for specific instructions.
pick up a bottle of HOT SHOT FREON, You wil need a EPA card to buy this. Just vacuum out your system then add about 12 ounces of the hot shot freon. HOT SHOT is a direct replacement for R12.
The EPA. They have no check or balance. Soon light bulbs will be a thing of the past, no more easy-bake oven. That's OK soon electricity prices will necessarily skyrocket.
R134a
The heater and the AC are different systems other than the blower, so they normally fail independently. The AC can fail for many reasons, high on the list are low freon (which means there's a leak) and the compressor.
First, your 1998 Mercury contains no Freon which is R12. It contains R-134 refrigerant. You add R134 at the low pressure port. But the fact that you need to add R134 indicates you have a leak. It is illegal to add refrigerant to a system with a leak without first repairing the leak. Seek professional help and have the leak repaired.