Question about 2002 Chevrolet Tahoe

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2004 tahoe can not find low side a/c port on suction side. its crazy there is a high and low side fitting on the high side thouh..

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  • jbnova Jun 01, 2010

    i have the same problem.
    there is a high and low side port on the high side line.. this is stupid and there is no port at all on the suction side!!!!! wow did chevy screw up here

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1 Answer

No,the fittings are on different sides of the A/C System. The blue cap is the low side,red or back the hi. The low is closest to the accumulator,before going into the vehicle and the evaporator inside

Posted on May 31, 2010

  • FtMill Apr 27, 2011

    on my 2002, i found that they are on the same line, BUT there is a check valve in between them. The low side is the side closed to the firewall. also, the fittings aren't the same size. If you get a refill canister, it will only fit on one side. As a side note, both of my caps were black.

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My 2005 Chrysler Town & Country 3.8 Liter AC is not blowing cold air. I would like to try recharging with one of the R-134 kits. Is the low pressure port that I would need to attach the R-134 canister...


the hose fitting that you attach to the low side port will only fit that port-it cannot fit the high side (that port is too big) so you cannot do this wrong. The low (suction) side is between the compressor and the evaporator (passenger compartment, usually in the heater core plenium.)

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1 Answer

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First find the A/C compressor, it is attached directly to the engine and has a pulley on it. When you turn on/off the A/C while the engine is running you should be able to locate it by listening for it to engage.

When you find it you need to trace the two metal pipes that come out of it. One pipe is the high pressure side and one is the low. You will know which one is the low side when you find the 'tee' with a plastic cap (both high and low have one).

The fitting that comes with the A/C recharge kit will only fit properly on the low pressure port. Sometimes, but not always the low pressure port has a blue cap.

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3 Answers

I want to recharge the a/c of my 2004 Rainier, but do not know where the low pressure port is and the caps are not marked with L or H. Help! Thank you.


The good news is a that vehicle has R134A which means the quick release from your refill can will only fit the low pressure side which is normally a little higher than the High. Unlike the old R22 systems the Low and High pressure connections are slightly different in size.

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Need to see a picture of high and low ports and their locations on a silverado pickup. can only find two ports on the same line -one smaller than the other.


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Trying to add freon , dont know which input is the high or low? how do i tell if they both are black and do not say which is which?


You have one small and large port. The quick connect should only fit the small port. Even though they are both black there is only one small and one large. These were staged like this to prevent the wrong hookup like what happened in the older cars causing small explosions from hooking up to the high (large)port. The small is the low side port.

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R134a recharger nozzle won't fit on low pressure service port.


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96 Tahoe no Cold Air


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1 Answer

I dont know where to add freeon to my 1999 kia sportage 4x4


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1992 honda ex


The Freon goes into the "suction" hose/pipe assembly. There will be a service port on this hose. The low side (blue) hose of the manifold gauge set gets connected to this fitting. The suction hose can be identified by it's larger diameter (compared to the discharge and liquid hoses). The suction hose will run from the compressor across the top of the radiator (slightly behind the radiator), then back towards the firewall on the passenger's side of the engine compartment. The service port is generally closer to the firewall, than to the compressor.

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