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When I turn on the ac I hear a hissing sound can that be a sign that I am out of freon?

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  • AC Master
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Either you have a serious leak and gas is escaping when the gas is compressed or you have a snake in the vent .

Posted on Sep 27, 2015

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Posted on Jan 02, 2017

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Jonah Oneal

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SOURCE: My dodge caravan is losing all its freon. I hear

you could have leaks at evaporator.

Posted on Jul 20, 2009

Anonymous

  • 2 Answers

SOURCE: Car AC stopped blowing cold, compressor turns on, Freon at 45

check the thermo control amp, it is a sensor that keeps the evaporator from freezing. I had that problem on my 2000, it's a common nissan problem, google nissan ac problems.

Posted on Sep 22, 2009

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2 Answers

Recharged AC, blew cold for 1 day then heard hiss near driver tire and now no cold air.


Whenever you add Freon,you are suppose to leak test first.Your compressor is good,you have a leak somewhere.A good place to take it to is Midas,they changed my freon over from the old stuff to the new R-134a,they leak test it first,that is rule 1 when adding freon.

Jun 11, 2015 | 2000 Pontiac Grand Prix SE

1 Answer

Hissing sound right after i turn the ignition on like air escaping from somewhere. it started right after I added freon to my ac. What could this be?


It's possible that there is a leak somewhere in the AC system and when you turn the car on the high pressure in the lines pushes some of the freon out. Normally you don't need to add freon so my guess is you have a small leak somewhere.

Aug 06, 2013 | 2006 Lincoln Town Car

2 Answers

AC NOT WORKING PROPERLY


You've got some of the picture, but not all of it.
You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere.
The hissing noise is freon flowing thru the system which could also indicate a low charge.

Apr 22, 2013 | 2009 Buick Enclave

1 Answer

1998 Olds Aurora, no heat, no air, just blowing air out the front


i beleive these are a vacuum system. if air temp is in cold position you will get no heat. listen for hissing noise with motor turned off but key on. if you hear hissing noise you have a hose broken or off. you will have to find it

Oct 30, 2009 | 1998 Oldsmobile Aurora

1 Answer

1999 Chevy Suburban - My rear air vents had COLD a/c coming out but my front vents had Cool/Warmer air coming out. I added a can of freon and now it needs more. I can hear a hissing sound near the joint...


The hissing is caused by the freon going through the orifice tube, so do not touch the 2 nuts. You will loose the freon in the system.

What's probably going on is the mode actuator is not functioning correctly.

Take it to a professional, a dealership should be able to help you.

Aug 12, 2009 | 1999 GMC Suburban

2 Answers

The ac will temporarily blow hot air on the drivers side, but remains cold on the passenger side. any advice?


this is a sign that the a/c system might be low on freon. I would have it recharged. Asked the tech to add dye during the recharge that way if the system gets low on freon he'll be able to use ans specail black light to look for the freon leak.

Jul 08, 2009 | 2001 Pontiac Grand Prix

2 Answers

Car AC stopped blowing cold, compressor turns on, Freon at 45


you are going to have to put tracer dye in the system and check for leaks
if no leaks then might be low on freon and or there is a resistance in one of the lines

Jun 10, 2009 | 2000 Nissan Frontier

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