Question about 2002 Chevrolet Avalanche

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A/C lost A/c today low pressure side high 100psi relieved pressure put in 2 cans freon to filled point lost again after riding awhile no leaks noticable but after driving with it off started to work again suspect comppresor going bad.

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Some systems if you overcharge them will stop working to prevent damage.
also some systems if they do not have enough freon won't work.
check under your hood, there should be a stamp saying how much freon it takes. try evacuating your system and charg it again with the specs.
and last i recommend you to evacuate your system because they grow moisture and also get contaminated with air. that messes uo the whole system.
hope this helps

Posted on May 24, 2008

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F 250 aircon problems


Sounds like a low Freon charge. You need to check the pressure in the system. You have 2 cutoff switches, one high pressure and the other is low pressure. You can not get more pressure without adding Freon, so it is likely that you lost pressure from a leak. Your low pressure switch is cycling too fast.

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if this freon is r-12 conpatible or replacment then your fine
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start engine put a/c to max blower motor to hi open windows
conect your fill bottle to low side open valve and system will start filling
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How is the best way to recharge freon in the ferrari 328.? any common point of freon leakage?


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1 Answer

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Wow thats hot!! Ok want a quick fix? You sound like ya have a leak so lets see whats going on....buy 3 cans of freon 123a...they come in 1 pound cans...get a low pressure charge hose.
here"s what you will do,
buy 1 can of leak detector freon 134a(1 Lb.)
1 can of synthetic freon 134a with oil(1Lb.)
1 can of 134a freon with sealer
Find the low fill port the fitting will only fit on low side....there are two one is the high one is the low they both have screw off caps use the bigger one...thread the first can with leak detect. in it and fill it through the port, turn a/c on high blow full a/c, jump out the compressor low pressure cut out switch...if you buy your stuff from Auto Zone the guy will show you which switch that is on a diagram he can supply for free just ask, next fill the leak stop can, then the one with a/c oil.
Should be cold, drive a while or until it leaks out and spot the dye coloration coming out of the system showing you where the leak is, bleed off the system repair the leak and refill like I just told you use up to 2 3/4 cans max.
Happy Motoring!!

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My 99 s10 blazer has ac problems. i tried to fill the refrigerant and the psi bounces between 55 and 20, it starts at 20 the builds to 55, then the clutch kicks on and the psi drops back dowm to 20. this...


I'm assuming that's the high side pressure reading. It sounds like you don't have enough refrigerant in there still. Depending on outside temperature the high should be around 130-150 and the low side between 25 - 30 or so with the compressor clutch engaged. Once you connect the can to the low side you'll have to start the car and turn the a/c on to get more in there until the pressure readings are correct.

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How do I fix a Air condition blow out hot air?


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The low side fill kit will not fit on the high side port so thank godness for that.
start the vehicle put the a/c on full cold high blow fan speed, start filling the low side with a can of 123a freon+oil additive, which equals one pound of freon and check the inside a/c vents, getting cold? If its perfect then you are done, the system may have a very small slow leak and if it only takes a one pound can to fill it once or twice a year you are ok, if it takes more you may want to add a second pound can of freon 134a containing a dye additive that will work its way into the system and show you where the leaks are by exposing a color once it hits the air coming out of the systems defective seals etc.,also they sell a sealer + freon one pound can that can be used to try to fix the leak without having to get too expensive on the repairs.
A car's air conditioning system only hold like 2 3/4 pounds of freon, so in the event you happen to over fill the system a high pressure blow valve usually mounted on the a/c compressor will purge off the excess, but let me warn you they blow off without any warning and can startle you. Always think safety first, wear protective equipment. Work Smart, Work Safe.
Happy Motoring!!!

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When i turn on ac it blows hot air


Normally due to low freon. Also, notice if the a/c compressor clutch engages, as it will not if the freon is low.

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do a pressure test. You may have lost freon to the point where it will not let the compressor come on. If you do not have any gages or access to a gage, buy one of the cans of freon that has the low pressure gage attached. Make sure you get the one that has 134A with sealer. The pressure should be about 100psi not running and go down to about 60 when it is running. IF you have a slow leak and the system is low, the compressor will not come on. If you get very low or no pressure when you hook up the can, don't waste your money, have the system checked for the leak. You must vacuum the system down to 30 inches of vacuum before refilling if it is empty, and it does not good to fill it if it is just going to come back out.

Hope this helps
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