Question about Chevrolet Suburban 1500

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Looking for low pressure port for servicing Freon in A/C system for 1998 Chevrolet Suburban. There are 2 ports on top of compressor. Which is the low side and which is the high side?

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The ports on my 2005 silverado are on the same line,which is very confusing but, in between the two ports is the metering device (orifice) which changes the high pressure gas into a low pressure gas.The two ports are of a different size,with the low pressure being the smaller of the two. You can put your hand on the line, on each side of the metering device connection and the high side will be hot and the low side will be cold

Posted on Jul 18, 2009

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The high side pressure line is the smaller of the two lines.
The larger line will be your low side line.
Good luck, any other questions, let me know.
Regards,

Posted on Apr 19, 2009

  • Ricky Gittins
    Ricky Gittins Jun 04, 2012

    Bruce your confusing people, " the low side PORT is the smaller of the two " YES. lkendrickrd you are right.

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Where is low pressure port ocated


there are 2 sizes,
there are only 2 Freon lines, one big and one small.
am I to guess that you cant just look at them and follow them>?
the tool (gauge) has only one size fitting and only fits the correct low side fitting, so if you looked you'd have seen it.
hint, its in the engine bay.
the loop starts at the fire wall to compressor then condensor and back to the fire wall.
read page 9 , HVAC , chapter ,under ZJ
all you need to do on any ca,r is look, longer than 1 second.

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Not enough info.with the compressor running and the charge line on the low pressure service port( the big line)it should charge. Be sure the compressor is running. If it's not: There is a low pressure switch in the big line. to check it disconnect the 2 wire connector, use a paper clip to jump between the 2 wires. If the compressor runs either the switch is bad or the pressure is not getting into the system at the fill port

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The high pressure service port is located on the liquid line between the condenser and the evaporator, near the front of the engine compartment. The low pressure service port is located on the compressor manifold, directly over the suction port of the compressor. Make sure you know what your doing if you connect the wrong thing to the wrong port you can blow something up.

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My ac light is blinking, and the ac compressor clutchpulley is not engageing. Its also blowing hot air

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Added freon to 2000 chevy suburban but its still not cool in front or back


Check the pressure of the low side port when the a/c is running the compressor. It should read 25 psi to 45 psi. If it's too low then it may be leaking out.

Check that the compressor is turning when the a/c is turned on.

Sep 18, 2010 | 2000 Chevrolet Suburban

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How do you connect a/c charger to make your central air cooler


The 1998 Dodge Caravan ac should be charged at the low pressure service port. This port is located on the suction line near the compressor. The suction line can be identified by it's size, it being the larger of the two line connected to the compressor. You must purchase a recharge kit at your local part store, which should include charging hose with pressure gauge and a can of R134a freon. Gloves and eye protection should be worn during servicing.(freon can freeze your eyes and cause frost bite to your hands). Connect freon to charging hose, connect charging hose to low pressure service port, open valves and start engine, turn on ac. If compressor won't start it may be required to disconnect the low pressure switch and jump out the connector.

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I need to add freon ton a 1998 suburban. I


If the compressor will run turn it on and let it run for a few minutes, the line that gets cold is the low pressure side, this is usually the one closest to the firewall. The reason that they are 6 inches apart is that they are on opposite sides of the orfice tube, hence one is high pressure and one is low.

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1 Answer

I have a 02 chev tahoe,with dual a/c.no cold air is blowing.compressor is cycling on/off at a fast pace.i see 2 ports on thin a/c line,but i think these are high pressure line ports?im tring to find low...


freon level is low . One of those 2 ports u see will be the one u want. It will be the smaller of the 2 as the refill hose will only lock onto the correct fitting.

Aug 10, 2009 | 2002 Chevrolet Tahoe

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AC Low Pressure location on 2004 Chevy Suburban


You find the AC low pressure at the top of the compressor, orientated toward you , facing the front of the vehicle. You can also follow the compressor line to reach the port.

The valve is covered a plastic cap covering it.
Near the compressor you find two ports, the high port and low 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 covered with plastic caps. Only one of the pipes will be cold, the cold line will lead you to the low port.

Regards.

Jun 18, 2009 | 2004 Chevrolet Suburban

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