Question about 1997 GMC Yukon

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Low side port?

Need to identify low side port for AC coolant

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Bigger of the 2 hoses is usually low side.

Posted on Jul 03, 2009

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What kind of ac coolant does it have 134a or r 12 and where is the low pressure port for the ac located


Depends on the year. Cars in the early 90's used R12. Anything later uses R134a. The size of the charge ports will define the R134a port. An adapter is needed to fit on the charging hose. R12 requires no such adapter. Ther charging label under the hood will tell you what refrigerant is needed too. Since you failed to give enough information on what make and model car you have, a general answer for the location of the low pressure port will be given. On the compressor, the larger diameter hose connection is the low side. Connect there, or look for the drier/accumulator (Large diameter silver container near the firewall). Connect there. You will need to access the AC information label under the hood to determine how much freon to add to the system.

Mar 12, 2016 | AC Cars & Trucks

1 Answer

My 2009 Dodge Ram 1500's AC is not blowing cold


Most likely your system just needs to be charged with r134a coolant. You can do it yourself. Just head down to the local auto parts store and buy a can of coolant that comes with a hose and gauge attached and then locate you low pressure port on you system. It is typically located on the passenger side between the radiator and the firewall on a silver tube. Don't worry you can't make a mistake as the coupler will only fit the low pressure side. When you locate it remove the cap and hook up gauge and can. Start the car and turn the AC to mac cold and highest fan speed. Then open the gauge depending on ambient temperature out side your gauge should read between 35-45 psi. The gauge should also be color coordinated as long as you don't fill until the gauge is in the red. Your good. Then close the gauge, remove it from the low pressure port and replace the cap on the port. (When the coolant is flowing into your system the can should turn quite cold and maybe even have some frost on it. No worries that is normal).

Sep 12, 2013 | 2004 Dodge Ram 2500

2 Answers

Where is the low ac port on 1999 Mitsubishi gst


The charging port is in the low side AC line from the AC compressor on the engine, the low side line is the larger of the two lines coming from the AC compressor.

Jul 11, 2012 | Cars & Trucks

1 Answer

2000 Pontiac Gand Prix HVAC


the large port is the low side. if the cap is on the on the port it will blue.red port is the high side.this does not have anything to do with the blower motor.

Nov 25, 2011 | Cars & Trucks

1 Answer

I am trying to refill my cars air conditioning refrigerant,so i matrying to locate Caravan's low side pressure fitting, is there any pictures on the web to look it up?


Hi, the low side port is located on suction side near compressor , it can be identified as the larger of the two lines from compressor. Using eye protection and gloves hook can to hose, hook hose up to port , open valves, crank engine , turn on AC.

May 30, 2011 | 2003 Dodge Grand Caravan AWD

1 Answer

At what pressure do i put the ac coolant at when charging


the pressure needed will change with outside air temp. but if you charge the low side to 35-40psi (high side 225-275psi if the a\c system is in good shape) you wont have any problems.
p.s. your low side port is on the accumulator\dryer under the pass. side fender. if you remove the headlight its easier to get to.

Aug 17, 2009 | 2001 Ford Focus

2 Answers

How do I fill air conditioner coolant.compressor is new, but I need to add coolant.


You need to evacuate mositure with a vacuum pump and then add a can of r134a with oil in the can. Then add more cans without oil. Up to the amount on the decal under the hood.
The low side charge port is behind the passenger fender well. Remove tire and the 7 fasteners holding the plastic fender liner in.

Jun 30, 2009 | 2000 Ford Focus

2 Answers

How do I add coolant to the air conditioning system of my 2001 Hyundai Elantra?


You need to locate the low port on the AC.

You recharge the AC connecting to the low port.

You find the AC low pressure at the top of the compressor. Near the compressor you find two ports, the high port and low port.
You can follow the compressor line to reach the port.

To find out which one is the low port, run the air conditioner for a couple of minutes withthe engine on.
Then turn off the care and touch the lines from compressor to the two ports , often covered with plastic caps. Only one of the pipes will be cold, the line that is cold will lead you to the low port.

Jun 18, 2009 | 2001 Hyundai Elantra

1 Answer

Location of low side ac port


the low side charging port is near the AC Accumulator/Reciever dryer cannister in the larger of the 2 AC lines.

Apr 07, 2009 | 1999 Ford Expedition

1 Answer

AC problem


yes you can flush out the coolant system, also you might need to recharge the AC system by using the Refergerint R-134A (which you can buy at autozone or other auto part stores) and charge the 134A on the Low side port.

Aug 13, 2008 | 2003 Toyota Corolla

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