Question about 2004 GMC Envoy

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2004 Envoy - Do I need to drain the refrigerant from my A/C system to replace the high pressure transducer or does it have a schrader valve?

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Anytime the AC system is opened, it needs to be evacuated and refilled with refrigerant and oil.

Posted on Oct 23, 2010

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Posted on Jan 02, 2017

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Backup park assistant shows disabled when backing up. It works sometimes but very seldon . I push the reset button but nothing happens, still wont't work.


This is a chronic problem with Ford products. One "cure" is to take your vehicle to a car wash and blast the transducers with high pressure water then park facing upward on a slope to allow water to drain. You may enjoy a fleeting moment of success. Another "cure" is replacement of the transducers.

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What type of freon is in GMC trucks of 1987?


R12.... In 1994 R134a was required, but some changed earlier. Yours may have been converted. If the service ports are threaded it still has R12. Hope this helps.

Jul 05, 2011 | 1987 GMC R1500

1 Answer

Where is the low pressure port for the a/c on a 2003 GMC Envoy? Is it the black cap closer to the radiator?


Look at the lines (aluminum) and the size of the lines. The low pressure line is the bigger of the two where as the smaller line is the high pressure side. Normally the low pressure Schrader Valve is nearer the radiator just up from the canister dryer.

Apr 15, 2011 | 2003 GMC Envoy

1 Answer

Where do I add freon to my '96 lumina?


You will add R134a refrigerant to the low pressure side. There willl be to schrader valves, one for the high, and low pressure sides. You can only charge the low side. To locate the inlet, you will follow the lines off of the a/c if you are not sure where they are, it will have a cap over the schrader valve that reads L, that is the one that you charge.

Mar 20, 2011 | 1996 Chevrolet Lumina Mini

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The A/C high side valve is leaking on my 1994 Chevy Silverado 1500. It's an R134a system. Can the valve be replaced


yes with a schrader valve removal tool but before you do that check for dirt in the openning of the valve and if no dirt try to tighten schrader valve hope this helps

Sep 17, 2010 | 1994 Chevrolet C1500

1 Answer

My 99 envoy 4.3 will not start, engine turns over.. fuses are fine, fuel sprayed out of the shrader valve.. thanks in advance


It doesn't take much pressure for fuel to come at schradrer valve.You need to know if there is enough fuel pressure to open poppets inside of the intake 40-50psi has to be at the schrader valve to unseat the ball on the end of the poppet,Are you getting spark?

Feb 14, 2010 | 1999 GMC Envoy

1 Answer

Have a 2003 stratus with intermittent A/C works great when on, where is the pressure sensor located?, that may be problem


On this Chrysler product they have an A/C Transducer located on the high pressure hose. The switch has three wires. They also have a thermo sensor located at the evaporator case behind the glove compartment. These two things are the only ones thatA jump in the system is only removing protection the system has. So it will damage your compressor or hoses. Find the compressor follow the high hose to the high pressure switch (transducer) it has three wires. Check under the dash by the glove box and you will see a round platick lid on the case with two wires that is your thermostat (thermo sensor).
control the compressor.

The A/C clutch is controlled by the A/C cycling switch (19E561) and the A/C pressure cut-off switch, which are connected in series. The A/C cycling switch is mounted on the suction accumulator/drier (19C836), and the A/C pressure cut-off switch is mounted in the discharge line at the A/C condenser.

The A/C cycling switch closes when the pressure on the low side of the system reaches approximately 276-324 kPa (40-47 psi). The A/C cycling switch opens when the pressure drops to approximately 163-175 kPa (23.5-25.5 psi), disengaging the A/C clutch. In ambient temperatures below -1° C (30° F), the A/C cycling switch will not allow compressor operation because of low system pressures.

The A/C pressure cut-off switch is used to interrupt A/C clutch operation in the event of high system discharge pressures. The A/C pressure cut-off switch is a single-function switch that controls A/C clutch engagement. When compressor head pressures rise to approximately 2896 kPa (420 psi), the contacts open, disengaging the A/C clutch. When the pressures drop to approximately 1724 kPa (250 psi), the contacts close to allow A/C clutch operation.

This problem can be caused by low refrigerant charge. Check with a manifold gauge set and temperature pressure chart.
The cycling switch is replaceable and there is a Schrader valve on the accumulator port so you do not lose your system charge when replacing. It screws on/off. It is available at any auto parts store. It protects the compressor from low pressure which can be caused by a loss of refrigerant and subsequent lack of lubrication and prevents evaporator freeze up. Replace the switch. It is about $10. The high presure switch is about $25.

Aug 26, 2009 | 2003 Dodge Stratus

2 Answers

How to release fuel pressure to replace fuel filter on a buick rendevouz 2004


if you open up the hood and find your fuel rail you should see a little cap just like what is on your tire valve stems. take the cap off and push the little valve in the center agian just like the valve stem on your tire. be vary carefull as fuel will spray out of this. that is how to depressurize the fuel system

Jul 29, 2009 | Buick Rendezvous Cars & Trucks

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