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Trying to find the low pressure side to charge the a/c

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Low pressure side will be the port closest to the silver canister (accumulator).

Posted on May 29, 2010

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Posted on Jan 02, 2017

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3 Answers

My car didn't take the R-134a


If your car ac is not taking in refrigerant, it could be caused by several things.
If you have recently done work on the system and you are going to fill the system the first time, you will need to pull a very deep vacuum before trying to charge in refrigerant. If you have already properly evacuated the system and having problems getting the correct charge adjusted, you may be having problem with pressure equilizing between the refrigerant source and your ac system. To get the refrigerant going again, you need to connect the charging hose on the low pressure side of the ac system and turn the fan and ac on cool. The pressure in the ac system on the low pressure side will get lower than the pressure in the refrigerant container and flow will start. When charging initially, charge liquid on the high pressure side and with the ac system running, charge gas on the low pressure side. To charge liquid, invert most container so spout is down, to charge gas, keep container right side up. Charging by gas help you to not over charge your system. Beware on most vehicle ac systems the suction and discharge connections are two different sizes and require the proper adapter. If you still having problems creating a pressure difference to move refrigerant, you can try immersing the refrigerant container in warm water or applying warm air to the exterior of the container.
Hope this helps.

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1 Answer

What causes high pressure on the low pressure side of the a.c. unit


Low side and high side pressures are high. Usually indicates an over charged system. do you have a charging guage! if not, go to any auto parts store to get one. advanced auto, auto zone ETC, this guage will tell you the correct amount of freon to put in it, on the low side only.

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1 Answer

2001 Ford Focus recharge ac?


You charge it at the smaller of the two AC lines from the compressor using a pressure gage, when the low side pressure is at 28-32 PSI the system is charged, I think you are overcharging the system which loads up the engine and causes it to slow down. CHECK THE LOW SIDE PRESSURE!

Aug 24, 2017 | 2001 Ford Focus

1 Answer

Is the low pressure side of 92 F-150 on the condenser or near the compressor.


LOW PRESSURE SIDE IS THE SUCTION CHARGE SIDE WILL BE FROM AC COMPRESSOR REFRIGERANT LINE TO THE ACCUMULATOR OR DRIER TO THE EVAPORATOR IN THE FIRE WALL THE AC COMPRESSOR LINE TO THE CONDENSOR IS THE HIGH PRESSURE SIDE YOUR DISCHARGE SIDE. DONT DONT TRY CHARGING AC SYSTEM AT THE HIGH PRESSURE SIDE. CHARGE AT THE LOW PRESSURE SIDE.

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Where is the intake port for freon in 2000 ford expedition


The AC is charged with R134 refrigerant through the low pressure side of the system, the charging port is on the Accumulator/Receiver Dryer, this is a round canister under the hood on the drivers side near the rear of the engine bay. Below is a picture of the Accumulator so you can ID it.


emissionwiz_110.jpg

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1 Answer

Need air cindition recharge, don't have cash to take it someplace, can you help with instructions to do this


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.

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AC not cooling for 97 Passat TDI


A/c should be charged on the low side while engine is running. Make sure high side valve is turned off. Low side reading should be around 32-35 psi at idle high side should not go above 250. I hope this helps,good luck

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2 Answers

Need to find the low side a/c connect to charge my a/c...help.


The factory doesn't provide a stand alone low side charging port, the only way I see to get to it is to take off the low pressure switch, and hook your gauges to the schrader valve. This will require an adapter, though.
On my diagrams it shows straight across from the high pressure port, and is the only opening to the low pressure line.
When you take it loose, jumper the terminals together in the wiring harness, so the compressor will still run and you can charge it.
On your car it is (low press switch) on the passenger side connected to the big AC line, in front of the firewall about 1/4 of the way from the firewall to the front of the car, under some hoses

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