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Along the condensor lines, you will find 2 ports that should have screwed on black caps, you will then remove the cap. Dependant on the year, you may need to upgrade the system R-12, vs R-134a; and recharge kits are available at various locations depending where you live. Also, the AC system is charged based on pounds, so be extra careful when attempting a new charge. Some vehicles only require 2 lbs.
There are 2 service valves on this modl of escort, one located on the right hand side of the radiator as you face the engine and one located next to the accumulator by the firewall on the passengers side. The high pressuresde is the one to the right of the radiator, and the suction side is close to the accumulator on the passengers side. Put freon in the passenger side next to the accumulator. The high pressure side is strictly for checking the head pressure, do not try to put freon in that side. Look for around 40 psi on the low side .. There are more technical ways to do this but this will get you into the right area. If you don't have a guage, add freon until the fan clutch quits cycling at fast idle.
The low side fitting is on the passenger side of the car, near the compressor and the headlight area, close to the drive belt, about 12" away from the radiator. Locate the black screw dust a cap, looks similiar to a valve stem cap on your tire valves. The high side connector is located in the engine compartment, passenger side, near the fender well back towards the alternator and very close to the drive belt. The high side fitting is much harder to find than the low side, the low side is in the open. The fitting you have for adding R134a from the recharge kit will not fit on the high side. The high side fitting is smaller than the low side fitting. Thank goddness for that for if you were capable of putting the fron can onto the high pressure line, it would develope so much pressure from the high side, it would or could explode in your presence.
Please be aware that you need to wear protective eye and hand gear when working on an a/c system(freon can blind you if sprayed directly in your eyes and can cause frost bite when over exposure to your skin.
This is really a fix for a shop, but what you are looking for is a fitting that looks like the air valve on a tire... but be careful, there is also a similar fitting on your fuel rail. The fitting you are looking for should be on the A/C line near your condenser (looks like another radiator) or near the dryer (which looks like a tall can).
There is a hose on the side of the coolant resevoir that has a straight blade screwdriver fitting in it. Open the fitting and this will bleed the heads on the LS. Without opening this you will never get the air out of the head, trust me.
your system is a 134a it is not freon based. the lowside is the bigger port and usually has a large black or blue cap on it it should be located near the a/c compressor on the driver side where the line goes to the condensor. your high side should be on the passenger side near the dryer it will be the smaller port and have either a black or red cap. the ,low side pressure should be 35 psi and the high side should be 150 psi. please rate this.....thanks
#1 you will need r134a freon. #2 the low side service port is located right at the firewall where tha line goes to the evaporator. #3 if wou bought a can of 134a freon with a hose that will hook to it, it will work. all service fittings for 134a freon are the same even though the high side and the low side will always differ