Question about 1999 GMC Jimmy

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LOCATE PORTS TO ADD FREON - 1999 GMC Jimmy

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The low pressure port is usually in the accumulator (aka receiver/drier) which is the large silver cylinder on the passenger side. If its not there, sometimes it is on the a/c compressor on the marge diameter hose/line. The high side is on the smaller line near the coolant reservoir. The low side is the one you want to fill with.

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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Make sure you use the Low Side (cold) for adding Freon.

(note: over the counter freon kits should not fit the High Side port anyways) 6d9ed8b1-112d-471e-93a4-44bee9a08459.jpg

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You have to locate the low pressure line and connector port. Trace the two lines back to the firewall that come from the compressor. You will find 1 port on each line. They are usually covered by a plastic cap of some type that unscrews. Your refill hose, assuming you have a standard refill can with attached gauge, will only attached to the low pressure side. The two ports are slightly different in size. The low pressure side should be the larger of the two lines you are tracing from the compressor.

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I have a 2005 buick rainier i need to know where is the low pressure port where i can add freon at


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Jun 23, 2010 | Cars & Trucks

1 Answer

Adding freon


There are 2 ports, the low pressure side is larger in diameter, and that is where you attach the freon container.
The thinner hose is the high pressure side, and is not where you add freon, but only attach a gauge.
Wear eye protection.
Locate the receiver/dryer, after the condenser.
It is a cylinder with a small glass port at the top.
With the engine running, add freon until you no longer see bubbles in this sight glass. But do not add more than that or you could blow the pump on liquid.
You can put the freon can in a bowl of warm water as it slowly is sucked in and ices up.

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I'm trying to add freon to 1992 Lexus LS 400 where is it located


the compressor has two hses coming out of it and one of the hoses/lines will go towads the radiator to the condeser the other will go towards the firewall,,under windshield ,this is the one with the low side service port it will be the small port on the larger line/hose the other one is a large port on a small liquid line/hose,,,,the small port is the one u will need to hiook up to ,on the large line/hose

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Air Conditioning


#1 you will need r134a freon. #2 the low side service port is located right at the firewall where tha line goes to the evaporator. #3 if wou bought a can of 134a freon with a hose that will hook to it, it will work. all service fittings for 134a freon are the same even though the high side and the low side will always differ

Aug 18, 2008 | 1998 Oldsmobile Cutlass

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