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the expansion valve is located at the evaporator, and the system must be purged before removing it. After installation the system has to be evacuated, and usually the receiver drier should also be replaced; then the system can be recharged. This is not normally a diy job unless you have the proper manifold gauges and a vacuum pump. Also, it is fairly rare that expansion valves go bad, to diagnose your problem would require pressure readings on the high and low sides of the system.
Jeep GrandCherokee SUVs manufactured in or before 1995 use R12 refrigerant. You must
retrofit these SUVs to accept R134 refrigerant using a retrofit kit
available at your local auto parts store before you can recharge the
system. In some areas, a license is required to retrofit an air
conditioning system. If this is the case in your area, take your Jeep
to a professional to retrofit the system.
your SUV to a mechanic to recover the R12 refrigerant out of the air
conditioning system. A license and special equipment are needed to do
this. Because R12 refrigerant is expensive, many mechanics will do the
job for free.
the Low Pressure Side connector port. You will find it on the driver's
side of the engine. Remove the blue or yellow cap marked L. You only
need to retrofit the system if you see a screw-type connector valve. If
you see a quick connect valve, the system already is R134 compatible.
Wipe the connector valve off with a clean towel. This ensures that the
retrofit connector properly adheres to the valve.
the long retrofit connector from the automotive retrofit kit onto the
Low Pressure Side valve. The retrofit connector has a special adhesive
on the threads that will help it adhere to the valve. Screw the
connector onto the valve. Tighten the retrofit connector using an
adjustable wrench. Place the cap provided in the retrofit kit onto the
retrofit connector. This keeps dust out of the system.
the air conditioning lines away from the compressor until you see the
High Pressure Side port valve. This is located near the Low Pressure
Side service port. Remove the red cap and wipe the port off with a
the shorter adapter onto the port. Twist it using an adjustable wrench
until it is securely fastened to the port. Place the red cap from the
retrofit kit onto the adaptor.
out the Retrofit Identification sticker provided in the retrofit kit
using a permanent marker. Remove the protective backing and place it on
the interior side of the hood. This lets future owners and service
professionals know that the system has been retrofitted.
the air conditioning system. See the related eHow titled "How to
Recharge Air Conditioning with Freon in a Jeep Grand Cherokee."
WARINING: Never try to evacuate the system yourself. A license and special
equipment is needed to evacuate the system. Attempting to do this
yourself will release refrigerant into the air, which is a federal
The low pressure valve is down by the AC Compressor. It is part of the aluminum manifold that connects directly to the AC compressor. It is accessible from above, but easier to reach from under the car.
By the way, is there any particular reason why you want to recharge your AC system? If it isn't working, adding refrigerant will not necessarily fix the problem. If the refrigerant has all leaked out, you probably need to evacuate the system first.
the high side should have a black cap with a letter H on it.... if you dont see it then look for 2 valves that have caps on them, the larger of the valve is the high side, the smaller is the low side, the low side is the only one you want to use if you are refilling the system you do not want to mess with the highside... the low side pressure makes it so you can recharge the system, the highside will not work to refill a system if you are using the store bought recharging systems... and the valve on the recharger will only fit low side... hope this helps you... the highside should be on the pass. side towards the rear o the engine...
There are two A/C refrigerant lines. The small line is your high pressure line and the larger line is your low pressure line.
Start at the fire wall and follow the "large " low pressure line to the compressor. The low pressure charge port will be some where on that line.
DO NOT try to recharge on the high pressure side ( small line )
Good luck, let me know.
The largest diameter line is the suction which is low. The small one that runs to a coil by radiator is high pressure. If there is no cooling then you may have air in the system which means a leak must be fixed first. Are you sure the compressor is engaging? You should hear it click and the engine bog down a little.