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AC Compressor My A/C Compressor is not starting. My Mechanic says he has to flush nitrogen into it, remove the gas inside and then try starting it.He did this and then topped up the gas, Now he is charging me heavily for the topped up Gas. Is it right what he did to start the compressor? My compressor was fully loaded with gas prior to the service.

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Sir I have lg ac split tpe 1 to 4 coomprssar and indoor raning. Only 5mint cooling only than indor unit cantny billing wat prpalm

Posted on Aug 12, 2015

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Does not sound right to me.My guess after doing what every he was doing he probably installed a start capacitor or repaired a burnt wrie, got the compressor running and charged for a lot of guess work. Just guessing.

Posted on Jan 04, 2008


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1 Answer

Are there some simple things that an amateur could check and fix when the ac is not going on?

Not really you have to be a licensed AC installer to remove and install refrigerant gas and check the pressure with gauges. The only thing you can do is check the fuses and that the drive belt to the compreser is not broken and is spinning the pump.

Usually is is lack of gas due to a leak. The won't gas it until they fix the leak. They test it with inert nitrogen, find the leak, suck the nitrogen out and fill with refrigerant.

May 27, 2016 | 2005 Mercury Mariner

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Hello, Am sure your day is good. I had earlier raised this concern:I have a challenge with the AC system of my 2007 Volvo XC90. When the AC is turned on, its cools outside(bur net area) around the pipes...

I am concerned that what you have been told may not be exactly true. If the pipe to the inside of the car from the ac compressor is frosting up ( water condensation) then it has a low pressure area which indicates that the gas is getting through the evaporator ( bit inside the car). If the evaporator was blocked then the low pressure switch would switch off the ac compressor (low gas/no gas)
because the gas could not get past the blockage then the high pressure switch would stop the compressor because of high head pressures which can damage the compressor.
The most logical thing is that the TX valve is partially blocked or the thermostat setting is wrong.preventing sufficient gas flow into the evaporator to cool the car.
If you car has a climate control system then that unit may need checking. Best have an accredited ac specialist shop check the system
And to answer you question as to possibility of flushing or cleaning or washing out the evaporator. this is not a possibility as there can be no moisture what ever inside an ac system. However you can check if the cooling fins on the evaporator are blocked with an oily type dust then you can use an ac fin cleaner . This will allow the air to pass through the evaporator fins and help boil off the gas from the TX valve.

Dec 30, 2014 | Volvo Cars & Trucks

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Why do we have to replace compressor all the time???

This compressor burned out due to lack of maintenance, condenser coils were clogged 90%. compressor overheated and blow out. I made video how To change compressor and filter dryer. Its a beer cooler. REPLACING COMPRESSOR TRUE AIR BEER COOLER R134A

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1972 chevy c10

the best suggestion is to give up on replacing compressor clutches and have the system done by an accredited ac specialist shop
excessive pressure from excessive gas is hydraulicing the compressor and making the clutch slip burning it out
next flushing the system removes all of the compressor oil in the system leaving the compressor running virtually dry
next when a system is opened , moisture laden air gets in and that has to be vacuumed out for a period of 2 hours minimum or the water in the air turns to ice and blocks the tx valve
freon gas ( if that the gas that is supposed to be used as many now run r134a) is inserted ,not by the can but by the low pressure and high pressure readings on a manifold gauge designed for that purpose
I would say that by now you would have spent more money than what it would have cost you at the ac specialist shop

Apr 22, 2017 | Cars & Trucks

1 Answer

94 olds 88 a/c

no it requires full 12 volts to work the clutch the coolant fans have no connection to the ac system so they will not run until the engine temp requires them to
there is a fan normally in front of the condenser coil that will start as soon as the ac compressor gets power
the ac will not work until there is sufficient charge in the system to activate the low pressure switch
have to ask are you using the right gas as 134A requires all new system( evaporator , condenser , compressor , hoses) as the pressures are very much higher than r12 gas

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99 Toyota Tacoma a/c reads high pressure on low pressure side

Does the compressor run?
Low side could be high without a running compressor.

A running compressor?
The expansion valve itself is about $50 and bolts in.
You will have to remove the 134a gas before installing a replacement expansion valve and vacuum the system before recharging.

Sep 07, 2009 | 1999 Toyota Tacoma PreRunner

4 Answers

AC is just blowing air. The compressor doesn't kick on.

no freon.. pressure test w/ nitrogen. 8000 btus is now junk. Spend the money on new unit otherwise find the leak. It leaked out thats why the compressor will never go on. Once you add freon she'll turn on...same as car.

Dont buy that name brand again. best of luck to you

Aug 17, 2009 | LG Heat cool Window Air Conditioner

2 Answers

AC system's lubrication amount?

The oil spec is PAG 150--68.00 ounces. General Motors issues Bulletin # 02-01-39-004B replacing PAG 150 oil with a lower viscocity oil. Thus, now indicates PAG 46 (P46D) oil for those vehicles.
There is a high pressure side and low pressure side to the system. The high vapor=compressor to the condensor. Low side vapor=compressor to evaporator. Your system will use R134a freon.

The A/C is a sealed system and when the compressor fails it circulates debris throughout the A/C system and contaminates it. Before replacing the compressor several other A/C parts have to be checked or changed.
Typically, the condenser should be flushed to remove any debris or contaminated compressor oil. Use approved flushing agents (aresol or liquid pour types), that evaporate quickly and don't leave any residue in the system. You will also need access to 'DRY' compressed air or nitrogen to push the flush through the system. Nitrogen (an inert gas), is best because it doesn't introduce moisture into the system. You need to do this a couple of times.
Accumulator or receiver drier should be replaced when you are replacing your A/C compressor. If don't replace your accumulator or drier you will probably void your compressor warranty. It's virtually mandintory to replace the orifice tube or expansion valve. The openings are usually about .050" and are quickly plugged. Be sure to clean all hose assemblies internally prior to installing your new compressor. Not doing this could contaminate your new compressor. Flush both ways until the flush agent exiting is clean, you will need to remove the hose assemblies to do this.
After you have cleaned, inspected and replaced all the parts, you connect the vacuum pump and remove the air from the system. Make sure it holds pressure. Then recharge the system with the proper freon and oil to the system specified levels.

No matter why you are replacing the A/C compressor there is a lot of other related work that has to be completed before you install the new compressor. Hope this helps, good luck.

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2 Answers

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You can install the parts I am sure without professional help, but you will need to have the system pulled down with a vacuum pump to remove all air and moisture, also u will need to replace the accumulator/drier canister an the fixed orfice. always use new seals, never reuse old seals, if the AC has been contaminated flush it with AC flushing fluid, if u don't the new/rebuilt compressor will fail, also if the accumulator is not replaced the AC compressor warranty will be voided, so keep the receipt's

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Your suction pressure is erratic, your max. pressure is to much high. You did not measure your unit current reading liquid line press. to complete the data. But the problem of your unit is not the compressor its the system. Try to reprocess the system flush the unit with nitrogen, isolate the capillary tube and flush it with nitrogen to insure that no restriction.

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