Question about 2004 Chevrolet Avalanche

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Location of ac low pressure port location 2004 chevorlet avalanch

Looking for location of ac low pressure port location to add 134a refridgerant

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Look back on the firewall for the two a/c lines. One is large and on is much smaller. The larger line is the low pressure line. Follow that line back to the compressor. The low pressure port will be on that line.

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Posted on Sep 01, 2012

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Low side charging port is next to the accumulator.

Posted on Sep 02, 2012

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SOURCE: location of low pressure port A/c to added 134a

Down low between the radiator and the engine. Look for the cap. Very hard to reach without burning your hand if the engine is hot. I had to rig a much longer hose to add 134a so the can would be upright while putting it in.

Posted on Sep 25, 2008

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1 Answer

Where is the low pressure value located so i can add freon into the compressor


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Can i add refridgerant to ac on my own?


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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.
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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.

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1 Answer

Location of low pressure port A/c to added 134a


Down low between the radiator and the engine. Look for the cap. Very hard to reach without burning your hand if the engine is hot. I had to rig a much longer hose to add 134a so the can would be upright while putting it in.

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