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A/C keeps losing freon. could it be the compressor seal?

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Could be a/c compr. best thing to do is add some dye into the ac system, with a UV light you will find the leak.

Posted on Aug 07, 2010


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2006 f150 larit a/c works good and periodicallythe compressor cuts out mabey for 15 sec or 30 min

Well, it can be several things. There are high and low pressure cut-off switches. The A/C freon pressure is directly linked to outside air (under hood) temperatures. So if you are at the extreme in either direction, the pressure switches may cut-off.

This is not to eliminate that a pressure switch can be bad. They can usually be replaced without losing Freon. On the other hand, if the Freon system was not sealed, moisture may be icing up and blocking the lines. This can be really bad if the ice forms in the compressor.

As part of a A/C repair a vacuum pump is attached to the Freon lines before refilling. The vacuum pump is run for some time until a vacuum is created and this will draw all moisture out. This will eliminate ice. Then you add the correct compressor oil and quantity and put in the correct amount of Freon. The best amount is usually the makers recommended fill. Maximum cooling happens when the compressor runs the longest and is a balance between the high and low cut-out points.

Aug 21, 2017 | Ford F-150 Cars & Trucks

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The freon on my Hyundai Sonata keeps leaking. I have taken it in 5 x in last month. Had new condenser put on last summer by dif mech. After 2 wks freon was gone. he didnt chnge orings. Cant find leak

the system has to have enough Freon to produce pressures to properly check for leaks. the entire system needs to be checked, lines, Schrader valves, condenser, all fittings, evaporator, compressor seals. there is a leak it just has not been found.

Jul 23, 2015 | Hyundai Cars & Trucks

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You need to check the freon level and if that is good check the compressor. If you have no pressure on the low side, when I say pressure on low side I mean vacuum, then most likely the compressor is bad or you have a leak someplace. You can get a freon fill kit at Walmart, Target, Auto Zone and most any auto parts stores. These kits comes with a gauge and connection hose. Typically if the freon is low the compressor won't activate. Connect the fill hose to the low Side of your AC and turn the AC on to Maximum with the engine running. If its a low freon problem the compressor will start to kick in as the pressure increases. Make sure you don't overfill the system as this will cause a seal or line to blow. Being a 1998 your vehicle should use R134A freon which is what can legally be purchased by a home mechanic. It cost about $12 to $20 a can and usually includes a leak detector additive and seal conditioner.

May 03, 2011 | 1998 Ford Ranger SuperCab

1 Answer

Air conditioner system loses coolant fluid in system by three days.

Freon is not really a coolant or fluid, but a heat exchanging gas.
And it seems you have a leak.

There are several methods for finding it.
The low tech method is to use soapy water and look for bubbles.
But that can't be used at the compressor shaft seal.
So there are also dyes you can insert that glow under a black light.
And there are also sniffers you can rent that buzz with loudness depending on how much freon it detects.

But the compressor shaft seal is the most common, because people forget to use their AC every month, to keep the seal lubed, soft and pliable. Once you don't use the AC for 6 months, you can count on the seal not being very good any more. Many cars turn on the AC with the defrost, just to avoid this problem.

Jul 07, 2010 | Cars & Trucks

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On my 2002 S type sport, the A/C compressor is leaking oil at the rear seal of the compressor. By removing the rear of the compressor, would freon have to be drained?

The compressor has no replacable seals that you can find,but if it is leaking at the line attachment,then you can replace the seals,but drain the freon first.It needs to be evacuated and recharged after the repair.

Feb 12, 2010 | 2002 Jaguar S-Type

1 Answer

I have a 1996 Suburban w/ rear a/c and I keep losing power to my a/c compressor. I can cycle the compressor on by hand if I use a power probe and go directly from a hot to compressor but I cant find why I...

AC systems have a pressure switch to prevent compressor from cycling when freon is low.if it's working occasionally,it most likely needs a 'booster shot' of freon.

Oct 14, 2009 | 1996 Chevrolet Suburban

2 Answers

Ac not working right

If the system was workin enough for you to add freon and stop leak you may have overcharged the system and blew out the location of the leak to make it lose enough charge that it shut down from being low on charge. There is a low pressure switch that will stop the clutch on the compressor from engaging when low on charge. The hose connections have O-rings and the system needs to be discharged and the Freon captured to replace the O-rings. ALL O-rings should be replaced at once if that is the case. Look to see where the red dye showed up if you put in the stop leak. Normally the seal in the compressor is what starts leaking first. It sounds like your leak is bad enough that stop leak will not be the answer so you may have to break down and take it to a shop to check the system.

Aug 31, 2009 | 1997 Chevrolet Cavalier

1 Answer

Changed Compressor not blowing cold enough

If you tried using a refrigeration "sealing" product before changing out the compressor, you most likely do need to replace the expansion valve.

The valve "flutters" open/close/open/close/etc/etc when in operation. The purpose is to allow the compessor to build up enough pressure to change the freon to a gaseous state. Once you put in the sealer, the valve becomes plugged with the product and cannot seat completely. After this happens, you never get a full phase change because the pressure cannot build up enough. You will experience reduced cooling. Change the Exp. valve and you'll be set. In the future, it is not advisable to ever use the sealer products as this can cause damage to other system parts, and especially the recovery units at the shop.

Jul 30, 2009 | 1999 Dodge Durango

1 Answer


Sounds like you lost your refrigerant in the system, couple options here, 1. Take the chance its a very slow leak and just recharge it or have it recharged, sometimes vehicles will last all summer or even more, but keep in mind, if large leak you just wasted some money charging the system. 2. If it was mine, most repair shops can send a dye through the system and pinpoint where losing freon. Losing freon is the most common A/C failure and keep in mind can get costly if not fixed right.
3. Last but not least is the compressor, not as common of a problem as losing freon but still could be the problem, this is where taking it in somewhere that deals with air conditioning on a regular basis could troubleshoot this easily, but hopefully the compressor is not at fault as they usually run $200 or more.

Oct 02, 2008 | 2003 Ford Taurus

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