Question about 1999 GMC Sonoma

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Recharging the A/C. Which valve to use?

Recharging the A/C. Which valve to use? The one on the line infront of the commpressor?

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Low side, the tool only fits this; on GM, usually it's blue capped

Posted on Jul 18, 2010


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After replacing locked up commpressor replaced the freon as condenser is running the high pressure line was not getting hot or warm

Often when a A/C compressor locks up it starts sending shavings and debris up the line which contaminates the drier and clogs the expansion valve or fixed orifice (depending on which one it has) long before it actually locks up.
You should replace the drier, expansion valve or orifice plus flush the system.
And hope you have not sent debris into the new compressor.
You should always include your make model and year of vesicle when posting a question.

Oct 01, 2017 | Cars & Trucks

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I have a 1995 cadillac sedan deville and I have replaced the condensor, the orfice tube,the commpressor and the dryer and one of the a/c lines.There is no leak in the system, however I cannot get the...

I have the wiring diagram and the "No Compressor Operation" troubleshooting chart for your vehicle, but it is too large to post here. If you want to post an email address in a comment, I will email it to you.

Jun 26, 2011 | Cadillac DeVille Cars & Trucks

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Do you recharge air conditioner on upper port or lower port

you always recharge on the suction side near the compressor. wear safty goggles!!!!This is the largest line and it will have a pin valve on the line for charging.Look for a sight glass ,it will be on the high pressure line near the dryer assy,a much smaller hose-line it will also have a pin type valve like a tire valve,the site glass is used to see if you are near full charge while recharging,buy observing bubbles.. if the unit is cooling the low side or line for charging will be cold,dripping with condensation on a hot day,and frosty on a cold day.if the system is low it will be warm and dry. but if it is low enough to be less than 50 psi the compressor will not opperate.

Sep 01, 2010 | 1994 Jeep Grand Cherokee

1 Answer

How do I check my ac compressor? it is not

Hi: Check and Make sure that the Fuse or Relay Swicth is Good if They Are Then Go to Plan (B) Find you a Partner to turn On and OFF A/C while you look to See if your Air Compressor Clutch is Engaging and Turning your Commpressor .You'll hear Click if its Engaging ,And If it working right you'll See that ALL The Pulleys are Moving/Rotating. If the Commpressor Clutch is Turning your Commpressor.If Clutch is not Engaging the Commpressor Go and Get a New Clutch and Install it. Hope this gets you the Help you Need, Please Reply By Voting on How My Solution Has Helped You. Thanks FROM: The WYOCWBOY

May 29, 2010 | 1999 Chevrolet Lumina

1 Answer

Ac and commpressor come on but heater stays on also

your climate control shut off valve may not be stopping the hot water to shut at the heater core take 2 people one in the car and one under the hood follow your heater hoses at fire wall you will see the shut off valve person in the car will lower the air temp in the car that valve will move to stop hot water to enter your car good luck CJ

May 12, 2010 | 1997 Lincoln Town Car

1 Answer

Where is the low pressure valve for the recharging the air conditioner on a 97 Olds Bravada?

it is located between the compressor and the accumulator. the quick disconnect valve is smaller than the high pressure valve so you can't make a mistake using the single recharging hose.

May 11, 2010 | 1997 Oldsmobile Bravada

1 Answer

Cant find low pressure valve to add freon

follow the larger ac line of the to sizes until u come to a port it is the low side ,is the smaller port this is what u want

Jun 27, 2009 | 2001 Ford Taurus

1 Answer


The PCV valve should be in the right end of the front valve cover in a rubber grommet
The fuel filter is located in the fuel line underneath the car on the driver's side, infront of the rear wheel.

Dec 03, 2008 | 2003 Chevrolet Impala

1 Answer

Recharging A/C freon

with the engine OFF you can charge it through the high side freon must be accurate among

Nov 12, 2008 | 1993 Mitsubishi Mirage

1 Answer

Ac recharge

You have a large diameter suction pipe 1/2" and a small pressure pipe 3/8" coming from your a/c compressor, follow the larger pipe until you come to a plastic cap sitting on the line, take off cap to see filler valve. Looks like a large tire valve.

May 31, 2008 | 1999 GMC Suburban

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