If you don't know where refrigerent goes in your car's A/C system, take it to someone who does.
134a refrigerant
R134a
Most modern cars use R134a refrigerant. My 1994 Escort uses it so I would guess your 1999 does too. You can buy cans of the stuff from WalMart or any auto parts place along with a refill kit. A can of refrigerant will only cost $10-15 but a kit might cost $30. The kit has instructions for refilling the refrigerant for the A/C. There is a low pressure and high pressure valve on the A/C system - the adapter in the kit will only fit on the low pressure side. Anyway, it's easy if you follow the directions in the kit. My Escort A/C system has quit twice and refill of refrigerant got it working again. I used the refrigerant that comes with some sealer as well in case it was leaking slowly.
The schrader valve on the low pressure side of the system.
If the compressor is not turning on it could be as simple as low refrigerant level. If the compressor IS turning on, it might be a stuck heater core valve.
First of all it does not contain Freon. It contains R134 or R134a. If it is low of refrigerant, then it has a leak. It is illegal to put refrigerant in a system with a leak without first repairing the leak. Take it to a professional and have it repaired, and the correct amount of refrigerant installed to the correct pressure.
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A blown fuse, lack of refrigerant or a blown gasket on your compressor to name a few.
It is called Refrigerant not Coolant. Your 1999 Ford uses R134 refrigerant.
it is on the right hand side of the car next to the power steering reservoir. and the line runs against the right fender.
It is on or at the receiver dryer or shimy can looking thing at the rear of the engine compartment. You need gauges and refrigerant recycling machines to properly service the a/c