Question about 2001 Chevrolet Venture

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Air conditioning blows warm air cheked presure it was 0

Is it low on gas or is the compresor gone

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  • Master
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Most likely low refrigerant. The compressor clutch will not engage if the refrigerant pressure is too low. That's why the compressor is not spinning. Have it checked ($free) / charged ($$$).
It could also be the A/C relay switch ($13). Replace it. It is located in the fusebox under the hood. Label: AC compressor.

Posted on Oct 07, 2009

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  • Chevrolet Master
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No gas/

Posted on Oct 07, 2009

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Posted on Jan 02, 2017

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Autozone.com has diagrams for free when you register your car on their site. You can test the low pressure cut-off valve downstream from the evaporator tank by disconnecting the harness from the switch and using a good size wire to loop into the harness.

If the compressor clutch kicks in, you have either low system pressure or a bad low-pressure cut-out switch. This is a test procedure. Even bypassing direct as you have done can risk damaging the compressor.

Besides Freon, compressors need oil, the right type, and a small amount. There are Freon cans which include an oil charge as well as sealers and conditioners to prevent or fix leaks. Remember that the system has a volume limit and more additives leaves less room for the Freon to work good.

If you have low pressure, it is possible that what is left is contaminated. Freon is a gas. Air is a gas. The system was suppose to start with Vacuum negative pressure by using a Vacuum pump(Loaner item). This means that total volume inside your hoses could be wrong. It is easier to understand when you consider the Freon changes back to a liquid and Air needs a much lower temperature to become a liquid. So you lose volume for the Freon to change back from liquid to a gas. It constantly cycles like this to make it transmit heat from the cabin to the outside.

I hope my solution is helpful.

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A/c compresor not engaging


Yes, freon must be present in the system in order to circulate the oil that lubricates your compressor. A low pressure switch is used to stop the compressor from running if the freon level/pressure is low. This is to keep your compressor from destroying itself due to lack of lubrication.

There are also several other reasons that an A/C compressor will not engage. Proper diagnosis is required.

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I have a 1999 323i BMW. The AC doesnt blow cold (on cool days it blows cool temperature but not common A/C Cold Air, Hot Days it blows Warm/Hot Air). The heater blows warm air but definitely not common...


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reparando el cloch del compresor del aire ay uma piesa electrica que genera electromagnetica para que el cloch trabaje remplasarla se emcuentra entre el cloch y la carcasa del compresor y revisar la precion del gas yponerle el gas recomendado por el fabricante

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My AC wont blow cold. As soon as I put freon in it, it blows cold for about an hour, then hot again. My friend told me that the orifice tube in his car needed to be replaced because it was convertine the...


Sounds like you might have a leak. If you charge the system and works for a time ,(hour, week, year) and then quits it sounds like perhaps the freon is leaking out somewhere. Freon does not ever get converted to air. Freon is in several states of existance while it is in your system. It is a high presure liquid, high presure gas, low presure liquid, and a low presure gas, but it is still always freon.
The valve your friend is talking about is called an expansion valve. What it does is to take the high presure "liquid" freon and allows it to pass into a low presure zone called an evaporator at a regulated rate. When you take freon at a liquid state high presure condition and expose it to a low presure environment it "evaporates" ( thus the name evaporator) and it gets very cold when it does this. This is where the cold air you feel coming out of the vents is made.
But the freon is in an enclosed system. By this, I mean it is never exposed to air, moisure (water), or anything else. I goes through all of these changes while inside this enclosed system.
Therefore, if the enclosed system is good then the amount of freon inside it will not change. If the amount of freon doesn't change then adding more will only make things worse.
I would suggest having the system checked with a hologen leak detector and/or system dye to find the leaks. Remember, if you have to add freon, then the freon that was there before must have escaped from somewhere.
Find a reputable shop to check the system for leaks. If it is leaking bad enough to run low in a hour it should be an easy to find leak.

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