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Old 06-09-2013, 02:58 PM   #1
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AC issues 95 mercury villager


When I bought this van in the fall, the AC belt was off. I put it on and the compressor wouldn't come on. Got out the shop manual. The compressor is getting power, so I jumped the low pressure switch. This caused the compressor to click on and off rapidly. The pressure gauge on the low pressure port would swing between 25 psi and 45 psi as the compressor cycled. No cold air comes out. When I reconnected the low pressure switch, the compressor will cycle the same way it did when I jumped it. Rapidly, swinging from 25 to 45 psi. With engine off, the low side pressure is 55 psi.

No cold air. Any suggestions on the cause and cure of this problem would be appreciated. I am guessing the magnetic clutch is bad and the compressor will have to be replaced.

95 Villager, 3.0 V6, 139K miles.

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Old 06-09-2013, 04:06 PM   #2
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AC issues 95 mercury villager


Sounds like low on freon. I believe that year switches the ground so you should always have power. If it cycles jumping the switch your wiring is good and so is your clutch. Static psi should be around 70 to 80 psi engine off depending on ambient temp.


Last edited by cjm94; 06-09-2013 at 04:09 PM.
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Old 06-09-2013, 07:46 PM   #3
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AC issues 95 mercury villager


I put in 18 oz of ez chill and the ac is definitely working. Might need another half of a can, but it is working.
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Old 06-10-2013, 06:56 AM   #4
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AC issues 95 mercury villager


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I put in 18 oz of ez chill and the ac is definitely working. Might need another half of a can, but it is working.
If you are charging just with a low side gauge charge it so it runs around 30 psi That should get you close enough to work good. Only way to get it perfect is recovering it and adding the proper amount
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Old 06-10-2013, 09:28 PM   #5
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AC issues 95 mercury villager


It cycles between 25 and 45 psi with the compressor on. Static pressure on the low pressure side with the engine off is 85 psi.
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Old 06-11-2013, 06:18 AM   #6
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AC issues 95 mercury villager


You should be pretty close then. Is it blowing cold?
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Old 06-11-2013, 05:47 PM   #7
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AC issues 95 mercury villager


Cool. Not exactly cold but works well enough that it is better than rolling the windows down.
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Old 06-11-2013, 07:33 PM   #8
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If it is still cycling fairly often put a little more in.
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Old 06-11-2013, 09:02 PM   #9
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If it is still cycling fairly often put a little more in.
Gonna be 90+ tomorrow so i'll find out if it needs more. Not much more though. 6 oz maybe.
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Old 06-13-2013, 07:34 PM   #10
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It got a C- on the 93 day test. Put 12 oz more ez chill and it's blowing cold now. If it weakens over the next few days I've got a leak.
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Old 06-14-2013, 06:00 AM   #11
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AC issues 95 mercury villager


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If it weakens over the next few days I've got a leak.
If that's the case, I am betting on one of two things. The rubber ball in the service port is worn out (easily replaced) or........ Evaporator Core (not so easily replaced).
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Old 06-15-2013, 06:24 PM   #12
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If that's the case, I am betting on one of two things. The rubber ball in the service port is worn out (easily replaced) or........ Evaporator Core (not so easily replaced).
Big planz, there are many places where a system can leak - usually a bad o ring, or like you said, the schrader valve. use soap bubbles to test the valve. Also, soap can work on other "joints". may not be the evap (if youre lucky).

Whatever you do, I would not add any "stop leak". Its a death sentence. If youre R134a had a dye in it, you can check for fluorescence with a uv light for auto ac at the many joints/hose connections. If not, get a can of dye and add some, then run the car, then check it.
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Last edited by noquacks; 06-15-2013 at 06:28 PM.
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Old 06-15-2013, 07:59 PM   #13
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AC issues 95 mercury villager


High of 86 today. AC performance acceptable. I will continue to monitor. The ezchill can said 'system safe' stop.leak, which i have read means 'makes O rings softer'.

Last edited by Bigplanz; 06-15-2013 at 08:04 PM.
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Old 06-16-2013, 07:35 AM   #14
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Hmmmmm, "system safe", I need to look into that . Very skeptical, I am. Its a form of gunk, any way one looks at it but Im not rendering a final judgement yet.

When you say "acceptable performance", is that with the car traveling at over 35 mph at least? That matters. OR say, measuring the temp at vent with car still, engine at 1500-2000 rpm? Idle car is not a good way to evaluate ac.....
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Old 06-16-2013, 03:23 PM   #15
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AC issues 95 mercury villager


Accptable at 35 mph after 3 minutes of driving.

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