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no big is low pressure and smaller line is high pressure the following link will show how to safely add freon --- Auto Recharge Yahoo Video Search Results DONT hook up to high side unless you have the proper a/c equipment the recharge tanks are hooked to the low side
first thing check AC compressor fuse.the AC compressor clutch should engage when you turn on airconditioner if AC compressor dont come on and fuse okay compressor clutch is open or low on refrigerant you need check your AC refrigerant low pressure side and high pressure side need a manifold gauge set. best let garage check out AC system could need system recharged or could have leak in the system.
NOT HARD TO ADD BUT YOU NEED A MANIFOLD GAUGE SET TO CHECK AC REGERANT LOW SIDE SHOULD BE 32 - 65 HIGH SIDE SHOULD BE 150 - 325 PSI. DONT PUT ANY REFRIGERANT IN AC SYSTEM IF SYSTEM NOT LOW.PROBLEM COULD BE ELSE WHERE COULD HAVE MOISTURE IN THE AC SYSTEM. CONDENSOR COULD BE OVERHEATING COOLING FAN NOT RUNNING OR AC AIR DOOR NOT OPENING.IF AC REFRIGERANT LOW THE LOW CHARGE PORT NEXT TO REAR STRUT TOWER ON PASSENGER SIDE LOOK FOR SMALL REFRIGERANT LINE WITH CAP GOING TO ACCUMULATOR THE THE INTO FIREWALL TO EVAPORATOR THATS YOUR LOW SIDE.GO TO AUTO PARTS STORE BUY AC R-134 RECHARGE KIT AND WHERE SAFETY GLASSES PROTECT EYES.
ok jeff yes there is a low side and it will be located by the ac resivoir up close to the firewall it will be a long cylinder with two hoses one of those hoses will have a fitting on it that will be the one a recharge cannister will fit on
YOU NEED A R-134 GAUGE SET TO CHECK LOW PRESSURE SIDE AND HIGH PRESSURE SIDE.YOU ALSO CAN BUY A LITTLE CHEAPER GAUGE TO CHECK YOUR AC LOW BLUE SIDE AND HIGH RED SIDE AT ANY AUTO ZONE OR ADVANCE AUTO PARTS.WHAT YOU DO WHEN YOU GET YOUR GAUGE SET HOOK GAUGE TO LOW PRESSURE SIDE BLUE CAP PORT AND GAUGE TO HIGH SIDE PRESSURE RED CAP PORT.YOU CRANK CAR UP GET IT OPERATING TEMPERATURE.THEN TURN AC ON HIGH COOL LET RUN 3 TO 4 MINUTES.CHECK LOW SIDE GAUGE READING SHOULD BE 28 - 32 PSI. HIGH PRESSURE SIDE GAUGE SHOULD 199 - 228 PSI. THATS NORMAL CHARGE. SEE YOU CANT JUST RECHARGE AC SYSTEM UNTIL YOU CHECK IT FIRST YOU WILL DAMAGE SYSTEM .NOW YOU CAN GO TO AUTO ZONE PARTS BUY A CHARGE CAN WITH GAUGE AND HOSE.ATTACH TO IT.YOU NEED MORE THAN ONE CAN.WARNING MAKE COMPRESSOR IS RUNNING WHEN YOU TURN ON AC .BECAUSE IF COMPRESSOR NOT RUNNING CHECK FUSE AND AC COMPRESSOR RELAY.IF BOTH OKAY.YOU COULD HAVE OPEN CLUTCH COIL A FAULTY LOW PRESSURE SWITCH WILL CAUSE AC NOT TO WORK. IF LOW PRESSURE GAUGE BLUE SIDE PRESSURE IS 28 OR 30 YOU DONT NEED A CHARGE.PROBLEM SOME WHERE ELSE.BE SURE TO WEAR SAFETY GLASSES WHEN WORKING ON AC SYSTEM.
Absolutely not! Never attempt to recharge from the high side. Recharging from the high side is extremely dangerous and could do harm to both you and the car. If the low side pressure is only 10psi, you are low on refrigerant. Most cars require 20psi to operate the compressor and should never fill to more than 40-45psi unless recommended by the manufacturer. I'd re-check the pressure readings. It's possible that instead of charging the system, while hooking up the hose, you've let freon escape, accounting for the hissing noise and the low pressure reading. When recharging the AC system, it's important to have the car running and have the AC on high. It's possible, you didn't have a good connection to the low side which also would account for the escaping refrigerant. I hope this answers your question. I'd try to recharge the system again on the low side, making sure the connection is good both at the low side valve and on the can of refrigerant. Best of luck. Greg