I can find the high pressure ( cap marked with an H) but can not locate the low pressure valve to add the coolent ... every where i look it says it should be marked with an (L) but i have followed every hose and can not find it ...
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Normal oil pressure should be between 40 and 60 psi. A cold engine will normally have higher pressure. If you're seeing 75 psi on a warm engine I would recommend having the pressure checked with a manual gauge to verify the gauge in the Jeep is working correctly. If the gauge is correct oil viscosity may be too high (oil too thick) or there may be a problem with the oil pump pressure relief valve. If the gauge is not correct the sending unit may be at fault.
You will add R134a refrigerant to the low pressure side. There willl be to schrader valves, one for the high, and low pressure sides. You can only charge the low side. To locate the inlet, you will follow the lines off of the a/c if you are not sure where they are, it will have a cap over the schrader valve that reads L, that is the one that you charge.
On the low pressure valve located between the compressor and accumulator. The low pressure port has a black or blue cap covering the recharge valve. Don't worry, you can't connect the hose to any other valve port but the low side, the hose end is different from the high side. The high side has a red cap, and is not a recharge port.
You need to add it to the Low Pressure Port which is on the Passenger side Firewall above the "computer" or PCM as well as your Coolant Recovery Jug. Keep the can in an upright position and turn the A/C on to recirculate, blower motor on High, all windows down and have someone accelerate the Engine to approximately 1500 RPMs. The port has a Black screw cap on it and if needed to find in the future, take Papermate® White out, and place a white dot on the Cap for future reference. Remember to close the Valve before disconnecting and since the pressure on the recharge line is lower at 1500 RPMs, disconnect it while it's running.
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
Look for the a/c pipe that has a blue cap on it, that's the low pressure side where the freon goes.
The pipe with the red cap is the high pressure side, you don't put the freon in that one.
I can't tell you exactly where the connection is, different models are in different places.
the low side is the smaller valve, and should have a blue cap on it... if not, look for 2 black capped valves, and the smaller on it is the low side.... the larger is the high side... hope this helps you....