Question about 2004 GMC Sierra - 2500 HD, 4WD, automatic, with 9200 GVW - Complete Lift Kit

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A/C is not cooling, checked freon..Pressure high..won't cool... may after 10 min start cooling

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Did you do any work to the A/C System like try and put Refrigerant in the System or change a hose . There is a switch that is located inline of the system that sometimes can stick before pressure build up or on the other hand pressure to low will make the A/C compressor cycle on and off . This works the power to the A/C Clutch which tells the Compressor to turn on as needed which you should hear clicking on and off when your hood is open. First of all if you found that you needed to add Refrigerant then you must have a leak because this is a closed system and their should be no reason to add Refrigerant unless you lost Refrigerant . Do you have a set of Manifold gauges or are you using a auto parts store recharge kit . The most common problem people have is the a/c compressor not running of shutting off to soon and not cooling the car down and the most common reason is a Leak , To Much Refrigerant , To Less Refrigerant , To much Peg oil added to the System , the Evaporator Pressure Operated Electric Switch and of course A/C Compressor Belts slipping and many other issues related to trying to do it yourself .In your case you said the pressure of Refrigerant was high so I assume you have a gauge of some sort . You under law are not allowed to just release into the Air the Refrigerant so if you have to much have it drawn out and put the correct amount in . If you get the pressure down you might find that the system starts running properly . If you still have an issue you can follow the steps I list to make the proper test to see what is going on . warm up the engine and set the A/C to the coldest setting and put the blower on highest setting next open the doors and keep them open so the A/C system does not cycle off as you look under the hood to see the Compressor and see if you can see the compressor clutch engaged the clutch makes a click and the center of the clutch will rotate . If it is clicking then you see the clutch stop then you may need Refrigerant or the system might be over charged . this is where having a gauge would be good . Now if the compressor s engaged and stays that way close your doors then see if the Clutch starts to cycle if so the system is fine if you have nice cool air coming out of your vents . The A/C is not going to keep the Clutch engaged at all times only as need by the temp control setting and temp inside the car . This is your starting point if you can't find the issue get back to me and we will take the next step. Good Luck .

Posted on Jun 11, 2014

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What are your actuall pressures and ambient air temerature

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Posted on Jun 11, 2014

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On my 2006 ac works good when engine is cool, in stop & go traffic it blows hot air & head pressure gets high in ac, car temp is ok what's wrong


How do you know head pressure is high? Do you have an auxiliary electric cooling fan that is not coming on in this situation? It should be in front of the AC condensing coil. There may be a switch tied to the system that is bad. This switch is sometimes activated by the pressure in the high-pressure line to the condenser coil. If there is not enough freon (134a) the pressure will not be high enough to activate the cooling fan switch. I recently added one can to my system and it made the fan run whereas it did not before adding the freon.

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My 2001 vw passat's a/c runs great for 15 mins at first start up of the car. After that - no cold air but the blower still blows. So if I dont have any further to go than 15 mins. Away im okay. What could...


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Good luck to you.

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2001 Volvo S80 2.9L air conditioner stops cooling after about 15 to 20 mins


This could be one of many problems so it's probably best checked by someone with the correct tools and knowledge.

That being said,

With your engine cold, open your hood and start your car. Check to see if your cooling fan is engaged, take note of its speed if it is. Then turn on your AC and listen for the compressor clutch to engage. once you hear it, check to see that your cooling fan is blowing, if it wasn't before. The fan should be on and in high speed whenever your AC is on, whether the engine is hot or not. If it is not, then the reason for losing cold air is that, due to the lack of being properly cooled, your freon pressure is getting too high and is causing the compressor to turn off.

If the fan is blowing as it should be, you may have a faulty compressor or the clutch on it may need to be shimmed.

Another culprit could be that your system is low on freon or the switch that senses the pressure is faulty.

And yet another culprit could be a faulty relay that is overheating and shorting out.

Sorry I couldn't give you a difinitive answer as to what the problem is, but without diagnosing it myself, this is the best I give you.

Good luck!!

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1 Answer

System not cooling space it cooled once before?


Hi, could be compressor loosing efficiency, i think suction pressure is to high at 85, also it could be moisture in your system, did mechanic replaces filter drier on high side of system , when he replaces evap. install filter drier on liquid line, if there isn't one, also check compressor valve, you can do that by cutting or desoldering the high side from compressor, connect charging port to compressor, conect your gauge charging port, start compressor, pump up to between 150- 200 psi shut off gauge, and leave for about 1 hr. then check pressure, if pressure decreases, then your compressor valve are leaking, if it maintain same pressure, then compressor valve is o/k. you can do same on suction side, this time in vacuum, if it holds vacuum pressure, then valve is o. k, RLA(LRA) lock rotor amps, is amount of amps compressor used to start, but will drop once compressor is running, 11.6 when operating is o/k, does your evap. compatible with condensing unit?, is it right size. check also that you're using right type of freon, check condensing unit & evap labels for right type of freon, make sure they can handle same type of freon. but check compressor valve carefully, i think your comperssor could be loosing it efficiency, compressor could be your problem. good luck.good luck

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did you check if the cooling fans are working? this is very important, because they lower the pressure of the freon before passing throughout the expansion valve and getting into the evaporator,more pressure means highter temperature, , of course when you are driving the air flow throughout out the condenser lowering the freon temperature in the condenser and lowering the freon pressure at the high side, tha's way the temperature inside the car is lower ... you can have a similar problem if the condenser is partially plugged..hope this was very helpful...

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1 Answer

1997 Mercury villager, Air conditioner was working, now compressor kicks on and off, shows over charge in the red, why? Nobody added any freon.


high pressure is usually from heat not being removed from freon in the condensor. Usually it's because the cooling fan is not sucking air through the condensor. Check your cooling fan relays (3) in the battery box in front of the battery. Also, check to see if cooling fan has failed.
Does it work ok when the engine is cold and then quit after engine warm up? That would be a clue. When pressure gets too high, there is a high pressure cut-off switch.

Other posibility is a restrcition in the system. not common though.

go here for more help

http://groups.yahoo.com/group/villagerquest/

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1 Answer

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