Question about 2000 GMC Sonoma Extended Cab

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A/C won't **** in the Freon

1. Low Press = 50PSI 2. High Press = 135PSI 3. Engine running 4. A/C Compressor Clutch Engaged 5. All valves between Freon can and (low side) double checked open. 6. Turned everything off. 7. Re-checked for pressure coming out of both high and low side ports from A/C. 8. Rechecked Freon (gas) freely able to come from can to end of hose. 9. Tried again - still failed to **** in Freon. 10. Anyone else ever experience this?

Posted by Anonymous on

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  • GMC Master
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Close all valves, connect the can to hose, start the engine and set the A/C to on high and then open the can valve. I know you have the lines connected right cause they'll only go on one way. Open the low side valve on the gage set to let the Freon into the compressor. It will suck the Freon from the can completely. If not completely empty, set the can in a bucket of hot water and I guarantee it will empty. If this doesn't work friend, there's something wrong in your system. Possibly need to replace the nozzle. It has to work though. There's no changing these phisics.

Posted on Jul 07, 2017

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i think that the problem is your A/C needs more freon134a it seems that when it has run for sometime the pressure gets too low and cuts out the LP switch

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Ac not working,tried adding 134a ,but wouldnt take it inyo system.


There are 2 valves, a high and low. R134 should be charged on the high side (bigger fitting of the 2). If your system has no refrigerant in it then you may have a bigger problem than low freon like a leak.

When you charge it the air condition settings should be on high and running. This will help with the vacuum you need to charge it. There is a good chance the clutch is out on the a/c, if it the level is low it will make a clicking sound when engaged, if the level is too low it won't move at all. If this is the case you will need to add oil as well as refrigerant (this comes as a mixture, read the label on the can and it will tell you if it has oil in it).

After turning on the car, run the a/c on high, use the correct fitting and try adding the freon again, if it still won't take it then you'll have to get it serviced, most likely the air compressor is out.

Jun 26, 2011 | 1992 Buick Park Avenue

1 Answer

Air conditioner compressor runs - freon is up to proper level....not cooling??


BOTH High and low readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;

1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.

2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?

3. What is the outside temperature at the time the readings were taken?
4. Check to see if the condenser fan blowing strong?

5. Notice if compressor clutch is cylcling excessively.
Could be overcharged, not enough air going across condenser fins, compressor not pumping sufficiently… BOTH gauge readings are really needed to get a better idea.
Below are normal car AC pressure readings with 134A.

Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor

Thank you for using fixya and good luck, keep me posted. Be glad to help you get your A/C running again soon.

Jun 12, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

2003 suzuki sx awd. during hot days 22 celsius, turn on a/c and loud rattling noise starts when car is at standstill at traffic lights. no rattling when on the move with a/c on. any good diagnostics will...


This hjas a possible two part problem, the first part is the a/c compressor has a clutch on the end of the shaft and is engaged with the a/c compressor switch turned on, which means while the car is running, you turn on the a/c and walla, you get cold air(as long as it is fully charged), the belt drives this clutch which in turn spins the inside of the compressor and starts to mechanically **** freon into it through means of the low(suction) side, the larger diameter port, once low pressure freon either 134a for everything built after 1994 or freon r12 for cars built before 1994 enters the compressor it is then compressed into a high pressure liquid which has a high pressure test port that is always smaller in diameter then the low side (fill) port.
When the clutch is engaged, it will only slightly rattle after it gets a few thousand miles on it however as the vehicle gets more useage and the a/c gets more useage(considered extreme condition useage) more use then normal vehicles would otherwise get, the clutch starts to wear out causing this rattle. A clutch head puller is used to remove the clutch can't do it without the proper tools, the belt must come off before doing the replacement.
Any parts store will have the tools and the clutch, you don't have to release any freon for this repair.
Another reason for a rattle could be the a/c system is low on freon and oil.
Buy a freon charge kit with a one pound can of 134a freon + oil combo and with the car running and a/c on high blow full cold attach the charge hose and freon into the low side port, rattle should cease soon as the vehicle reaches is full charge, should't take more then 2 pounds(cans) of freon, system hold 2 3/4 pounds empty each can is one pound.
Happy Motoring!!

Jun 09, 2010 | 2003 Suzuki Aerio

2 Answers

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.

Jun 05, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Where is the expansion valve located on a 98 Grand Am 3.1?


Grand Am has an expansion valve. Link below has part number and picture of what you are looking for.
http://www.discountacparts.com/addtocart~year~1998~make~Pontiac~model~Grand_AM~descript~A-C_Compressor~part~60-40281.asp

Unfortunately, I do not know precisely. But for the most part auto a/c's are all the same. Below I will describe how to find it. I have also included a aguide to determine system operability that may or may not be helpful. Just trace the system with flow path described below the valve has to be between condensor and evaporator.

Reminder the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

May 31, 2010 | 1998 Pontiac Grand Am

1 Answer

My ac wont get cool.......it blows hot air and(caddy seville 95)


Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

May 29, 2010 | 1995 Cadillac Seville

1 Answer

1992 ford aerostar ac not working


Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP2_bing.gif liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer back to the compressor suction.

May 29, 2010 | 1992 Ford Aerostar Extended

1 Answer

Air conditioning not working


Below is a guide to troubleshoot and check system function. This can be done by most folks.

Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.

If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Means low freon capicity because of a leak.

The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.

The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch. Connect a new can of freon
and fill to system capacity.

The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.

The system should be filled until suction pressure is about 30 to 38 psi..

Remember the flow for the a/c system is :
1. From the compressor a high pressure (HP) gas goes to the condenser in front of the radiator.
2. From the condenser a HP2_bing.gif liquid goes to an expansion device (orifice tube or expansion valve)
3. From expansion device the low pressure gas enters the firewall to the evaporator.
4. From evaporator the low pressure liquid/gas mixture goes through the dryer2_bing.gif back to the compressor suction.

May 29, 2010 | 2006 Chevrolet Trailblazer

2 Answers

HOW TO PUT FREON ON LINCOLN LS 2000


1--Turn your stearing wheel all the way to the left, so you can get to the a/c compressor, (compressor is under the car, on drivers side, near left front tire)
2 --On the drivers side, Jack up the car, a black cover under the car conceals the compressor, 2 little screws removes the cover, look for the compresser, left side near the front tire, once you remove the cover you can see the compressor.
3--there is a black or blue cap on the end of the compressor, this is where you input your refrigerant.
4-- turn your car on, turn AC on High
5. connect the the refrigerant tube to the compressor, and allow 5 to 10 min for it to go thru your cooling system.
6. check your ac for coldness.

hope this helps you good luck

Jul 09, 2009 | 2002 Lincoln LS

1 Answer

How to trouble shoot air condition compresuer


You really want to troubleshoot your AC. Here are some items to follow:
1- Make sure your Compressor clutch work first. You can jump the wire to test it when the engine is off.
When you know the clutch work then you can look for the other things not makeing it activated.
2- It it doesn't work then you know the problem right there.
3- If it works then check the Low and high pressure according to compressor spec.
3- Check your engine temperature sensor. Don't think that your temp reading gauge is coorect then your engine temperature for your AC is working.
4- Check your compressor sensor speed. It has to be in sych with your crankshaft sensor before it allows the clutch engaged to prevent burning your compressor when it is locked up is in freezing mode ( ex.in case some clever people jumping wire to control the clutch bypassing all other rerquirement).
5- If you think these items need to be addressed by professional better then do-it yourself then I have no objection. Good luck on trying.

Jul 09, 2009 | 2001 Chevrolet Blazer

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