Air condition Recharge - 1997 Jeep Grand Cherokee

The first thing to do would be go to your local auto parts store and buy an air conditioning recharge kit. Provided your vehicle isn't too old, they sell recharge kits that require no tools.

If their is a leak anywhere while you recharge, you will know.

Try recharging the air conditioning first, it is very simple and the kits come with simple instructions.

If there are no leaks, your A\C will blow cold air again. As for the pressure, if it continues to slightly blow air you may be looking at a new air compressor unit or a vaccum line. A new unit will run you anywhere from $200-$2000 dollars plus labor depending on the vehicle.

If the recharge works, at least you will have slightly blowing cold air rather than hot and you can continue that way until the unit fails.

The caps are generally different sizes, the recharge hose from the can, will only snap on to the correct one.

You will need to recharge your A/C system. You can purchase the kit to recharge it at any local auto parts store.

FOLLOW THE AC COMPRESSOR LOW PRESSURE TO THE ACCUMULATOR AND EVAPORATOR LINE GOING INTO BACK LOWER FIREWALL LOOK FOR A LINE WITH A BLUE CAP ON IT.THATS YOUR RECHARGE PORT.

The Low Pressure Side connector will be smaller than the High Pressure Side connector so the refill hose will fit properly only on the Low Pressure Side.
Read more: How to Recharge Air Conditioning with Freon in a Dodge Ram | eHow.com http://www.ehow.com/how_4484569_recharge-air-conditioning-freon-dodge.html#ixzz0uLCDkUE8

On suction line near the compressor

recharge a/c with 134a

Just get an R134a recharge kit, and follow the instructions.

The kit contains canisters of oil and R134a and a hose with a gauge on it.

Add about 2 or 3 cans of refrigerant on a system where the refrigerant leaked out.

One may also want to add leak sealer. which comes in a can like the pure 134a.

Cost depends on the problem. Does it still cool, just not as cold as it used to? You can recharge the system youself if the compressor still turns on. You can purchase refridgerant at any auto parts stores. Here is a video of how the recharge process works:
http://www.ehow.com/video_2327545_charging-air-conditioning-compressor-ford.html

You will need R134a, and a filler hose. Charge the system on the low pressure side, it should have a blue cap on the charge point.
Your filler hose will only fit the low pressure side, just in case the cap has been removed.