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car air conditioning not blowing cold air


whatchain
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the air conditioner in my car doesn\'t seem to work. the heater and fan works fine but when i press the ac button, the green light comes on but doesn\'t blow cold air. does anyone know whats wrong with it? or what should i check? weathers getting hot, would like to get the thing fixed soonish. (>.<)

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 whatchain']

ac belt is there. what do you mean service the air con? i\'ve only noticed the air con dont work yesterday when i tried to use it.

[quote name='funkytown said:

probably needs re gassing.

the answer is before you. take your car to an air con place, they can test it to see if its empty or not, and often regas them then and there for you.

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Aircon is something that needs servicing sorta like you change your oil just not as often. Better to use it than not use it too. Coming from someone who has had 1 car out of 6 with working aircon as it gets removed sounds weird but we do air con at worklol.

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 madmike said:

A/C only needs servicing when it stops doing what it should..

Check all your fuses before you take it in for repair.

Best advice is to run your ac at least once a month.

Stops gas leaks.

First lie Ive seen you tell sir.

Air con is a servicable item if you catch it early enough you can sometimes get away with topping up the gas. Unless you only change your oil when you run a BE or seize something. You arent that guy. Compressors are common to die as they run out of oil? Weird... The worst is farmers whos aircon dies at the end of summer so they leave it till next summer before they look at it.

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 evowrx']

[quote name='madmike said:

A/C only needs servicing when it stops doing what it should..

Check all your fuses before you take it in for repair.

Best advice is to run your ac at least once a month.

Stops gas leaks.

/quote]

First lie Ive seen you tell sir.

Air con is a servicable item if you catch it early enough you can sometimes get away with topping up the gas. Unless you only change your oil when you run a BE or seize something. You arent that guy. Compressors are common to die as they run out of oil? Weird... The worst is farmers whos aircon dies at the end of summer so they leave it till next summer before they look at it.

Whats your trade dude??

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 madmike']

[quote name='madmike said:

A/C only needs servicing when it stops doing what it should..

Check all your fuses before you take it in for repair.

Best advice is to run your ac at least once a month.

Stops gas leaks.

/quote]

First lie Ive seen you tell sir.

Air con is a servicable item if you catch it early enough you can sometimes get away with topping up the gas. Unless you only change your oil when you run a BE or seize something. You arent that guy. Compressors are common to die as they run out of oil? Weird... The worst is farmers whos aircon dies at the end of summer so they leave it till next summer before they look at it.

Whats your trade dude??

Im a stay at home dad. Just say you arent serious please. ;)

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Refrigeration engineer. 20years in the trade.

Specializing in commercial, industrial , transport and defence aviation flight A/C systems.

If your "topping up gas" you are sloppy.

No system these days should ever be "topped up" with refrigerant.

And compressors "run dry" when enough refrigerant has leaked out of the system and the compressor pumps oil out into the system to try and balance out the lack of refrigerant in the system.

This does not happen on modern car ac systems as the system has a low pressure switch on the "low" side of the system to protect the system.

If a system is gas tight it should never need to be serviced. EVER.

The reason you need to run the ac monthly is to lubricate the carbon/ceramic seal in the fromt of the compressor.

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 kwi_fozze said:

air compressers in auto a/c is the same concept as fridges. if run without gas in, air gets in to the internal lubricating oil and f**ks it. getting a regas may sort you out, but you may also want to keep an eye open for a new a/c pump.

Wrong...

Air in a refrigeration system creates moisture which reacts with the refrigerant and oil breaks down and produces acid which eats the system from the inside out. That is why refrigeration Systems have "dryer" cores piped into systems to capture any moisture present.

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Im meaning regas not top up sorry but yeah owned publicly lol :-[

I only know what the air con chaps in the workshop tell me I dont go off on a tangent to know this stuff it doesnt interest me. Mine have mainly been buggered clutches so strip it out as not a necessity for me. But if you have a problem and its leaking then it will eventually die and stop working hence getting it regassed and checking the system. Correct? I dont question why, air con dilligaf.

No offense sir I respect your work youre knowledgeable on everything.

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 madmike said:

Refrigeration engineer. 20years in the trade.

Specializing in commercial, industrial , transport and defence aviation flight A/C systems.

If your "topping up gas" you are sloppy.

No system these days should ever be "topped up" with refrigerant.

And compressors "run dry" when enough refrigerant has leaked out of the system and the compressor pumps oil out into the system to try and balance out the lack of refrigerant in the system.

This does not happen on modern car ac systems as the system has a low pressure switch on the "low" side of the system to protect the system.

If a system is gas tight it should never need to be serviced. EVER.

The reason you need to run the ac monthly is to lubricate the carbon/ceramic seal in the fromt of the compressor.

So just to pose a question. Because we don\'t live in a perfect world, what happens when they don\'t run gas tight, eventually leak out the refrigerant and run the compressor dry? As only one of my cars has ever had A/C that actually works (not a Subaru either). But surely getting it serviced/checked by someone who knows what they\'re doing would prevent the system from drying up and dying as most people only take notice once its dead. And then wait til next summer to do something.

Due to this, I\'ve been meaning to drop mine into a specialist to check it for me to make sure it is gas tight and operating as it should.

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Hey dude..

Do you run your a/c like weekly? If not the is a real possibiliy that the compressor shaft seal has dryed out and that will be where your leak is. A shop should be able to spot it as soon as they throw the gauges on..

If the system is just low in refrigerant the should reclaim what is left vacuum the system and dump a full weighted charge of new refrigerant in. And do a leak check of the system to make sure it is gas tight.

If the gas completly gone ie at atmopheric pressure. They will need to put a trace amount of refrigerant to leak check and boost the to operating pressure with nitrogen. Perform a leak check to look for a major leak and once found repair. Fit a new reciever dryer Then evacuate(vacuum pump) the system and dump a new weighed charge of refrigerant into the system.

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 Koom']

[quote name='madmike said:

Refrigeration engineer. 20years in the trade.

Specializing in commercial, industrial , transport and defence aviation flight A/C systems.

If your "topping up gas" you are sloppy.

No system these days should ever be "topped up" with refrigerant.

And compressors "run dry" when enough refrigerant has leaked out of the system and the compressor pumps oil out into the system to try and balance out the lack of refrigerant in the system.

This does not happen on modern car ac systems as the system has a low pressure switch on the "low" side of the system to protect the system.

If a system is gas tight it should never need to be serviced. EVER.

The reason you need to run the ac monthly is to lubricate the carbon/ceramic seal in the fromt of the compressor.

/quote]

So just to pose a question. Because we don\'t live in a perfect world, what happens when they don\'t run gas tight, eventually leak out the refrigerant and run the compressor dry? As only one of my cars has ever had A/C that actually works (not a Subaru either). But surely getting it serviced/checked by someone who knows what they\'re doing would prevent the system from drying up and dying as most people only take notice once its dead. And then wait til next summer to do something.

Due to this, I\'ve been meaning to drop mine into a specialist to check it for me to make sure it is gas tight and operating as it should.

Hey Koom.

Yeah the biggest place for gas loss in car ac is the compressor shaft seal. It is a carbon /ceramic seal lubed by the compressor oil. Back in the good old days it was common for systems to leak when the ac was not used for 6 months and when the system was turnd on the compressor pumped it\'s oil out and siezed.

This only happened on he very early systems though.

Designers quickly learned to put in safety pressure switches that prevented the compressor starting if the pressure in the system was too low.

So it is vurualyy impossible these days to sieze an auto ac compressor.

Running your ac once a forntight for ten min lubes the seal and prevents gas leakage.

I use mine all he time for defogging the windows... Turn heater to hot and turn on ac. You will be shocked how much quicker it works.

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 madmike said:

Hey Koom.

Yeah the biggest place for gas loss in car ac is the compressor shaft seal. It is a carbon /ceramic seal lubed by the compressor oil. Back in the good old days it was common for systems to leak when the ac was not used for 6 months and when the system was turnd on the compressor pumped it\'s oil out and siezed.

This only happened on he very early systems though.

Designers quickly learned to put in safety pressure switches that prevented the compressor starting if the pressure in the system was too low.

So it is vurualyy impossible these days to sieze an auto ac compressor.

Running your ac once a forntight for ten min lubes the seal and prevents gas leakage.

I use mine all he time for defogging the windows... Turn heater to hot and turn on ac. You will be shocked how much quicker it works.

Cheers for the explanation. Mine gets used all the time so its good to know about using it for the seals etc. Been thinking about getting it checked mostly so I don\'t loose it. Having it is much more comfortable than sitting in traffic with all the windows down! ;D

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