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Freon will not enter the compressor

Cannot add more freon

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  • Cars & Trucks Master
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Need more info, what kind of freon? What tools are you using? Have you talked to the store you bought the freon from?

Posted on May 02, 2015

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Posted on Jan 02, 2017

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1989 s 10 blazer won't take freon has 55 psi on low side while filling with comp. On only 20 psi high side where should I look for prob.


Sounds like the fittings are reversed.
With the compressor running, the low side should drop below zero then climb to 60 or 80 psi as you add freon.
You would need to jumper the low pressure switch to engage the compressor clutch to add freon. The compressor must be running.

Mar 22, 2015 | Cars & Trucks

1 Answer

Is there any easy and cheap way to find out if the compressor is bad; it won't blow cold nor will it let us add any r14


I'm assuming you mean R134 if it is a 2000 model car.
Not sure what you are saying the problem is. The compressor has to run to add freon if it is low. Normally you jumper the low pressure switch to make it run while you add freon.
Is the compressor running ? And if so, what are the high and low gauge readings ?

Feb 03, 2013 | 2000 Mercury Sable

1 Answer

My compressor will not come on ,they say if freon is low that could cause it ,but I think I have to have the compressor on to add freon


No it does not, you can add R134a to the low side of the system and when the low side pressure reaches the minimum psi the compressor will kick in. If you need to add more than 1 can then you may have a leak and will need to have it serviced.

May 31, 2012 | 2001 Pontiac Grand Prix

1 Answer

I'm not sure if the compressor is out totally, or if it just needs freon, but the a/c is blowing warm air and not cooling. The compressor was making noise, like it was working harder, but now, the...


Well, if shes out or low of freon, the compressor will not come on. Start buy adding a can to see how it works then, before you decide you need a new compressor. You can add a can your self it is easy. Buy you one with a reusable hose that will also come with a gage. The gage will give you a reference if you have enough freon in the system. Look under your hood for a sticker which will tell you how much freon it takes. Buy you a can with more Oz. than the system takes. So you will have some left over in case you need more later. Find your compressor and follow the lines out away from it. One line which is smaller goes out to the front of the car. The other bigger line should go over to the pass side and twist and turn into a cylinder at the wall. Look on this line for a port, will have a plastic cap which will screw off to access the fitting to add freon. The hose end will clip onto this fitting and you are all set. Hope this helps Fix Ya up.

Jul 23, 2011 | 2004 Toyota ECHO

1 Answer

We added freon but it still doesnt blow cool air.


When adding the freon, did you add it using a pressure gauge? If there is too little OR too much freon in the compressor it won't turn on. Could also be the compressor relay or switch.

Mar 20, 2011 | Hyundai Santa Fe Cars & Trucks

2 Answers

Air conditioner does not cool in 2000 Yukon.How do I check freon level and how to replace freon if need be


Get an r134a refrigerant add kit from Walmart or your local auto parts store.

You can even get a can of Arctic Freeze by Intermatics that has a hose and a gauge on it.

Connect the hose to the low side port. You can find this port on the 'thicker' piping that comes off of the compressor (versus the thinner piping that comes off the compressor which is the high pressure side).

Pressure should read 25 psi to 45 psi on the low pressure side when the compressor is running and the a/c is on.

Pressure should read 75 psi to 100 psi on a hot day when the car is off.

However, you'll want the a/c to be running when you add freon.

Press the button on the can to install more freon, if needed.

Aug 19, 2010 | 2000 GMC Yukon Denali

1 Answer

How do you replace the compressor? Is there an online mannual? 2003


Physically changing the compressor is easy. Just two freon lines, a belt, one clutch wire, and a few bolts.
But first you need to capture the old freon, which needs a vacuum pump and tank.
It is technically illegal to just vent it, and it is dangerous because of the pressure and cold. (wear eye protection and gloves)
You also need to add the right amount of the right type of oil, depending on the type of freon (a 2003 should be R134a).
But instructions should come with the new compressor.
Then you need to add the correct amount of freon.
If you saved it, then you just put that back in.
Otherwise the instructions should tell you how much to add.

Jul 10, 2010 | Cars & Trucks

1 Answer

My a/c compressor works but blows low cool air instead of freezing cold. A mechanic said I need to vacuum the inside and add freon. Can I add freon my self?


Yes you can, go to any auto parts store. Putting vacuum on the system to empty is just to make sure any outside moisture didnt enter the system through whatever leak caused some of the freon to discharge.

May 21, 2010 | 2000 Nissan Maxima

1 Answer

My a/c is not blowing cold air. The compressor does not kick on when I turn the a/c on. I have tried adding freon to it but it does not allow any freon to enter the system. I have checked all the fuses and...


The compressor probably isn't kicking on beacuse it is low on freon. It won't take freon when you try because the compressor needs to be running to draw it in. Sounds like a catch 22 doesn't it? There is a low pressure switch either in the filter/drier, or on the low pressure line. If you unplug the switch and hook a jumper between the two pins, the compressor should kick on, allowing you to add freon. Hope this helps...

Jul 14, 2009 | 2006 Kia Sorento

2 Answers

How do I add freon to the A/C on my 1993 Subaru Impreza ?


Hi DO NOT BYPASS the tryrister switch!!!!!!!!!.

You can safely add R12 (freon) from a can with the system not running ,when you have enough gas and oil mix added to the system the compressor will stsart automatically the problem you have is not knowing if there is a leak in the system,as you need to check this as venting R12 to the atmosphere can land you in prison if caught !!!!,.The best advice I can give you is take the car to an Air-con specialist and he will carry out all the checks on the system for you and re-gas the system properly.

Jul 10, 2009 | 1993 Subaru Impreza

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