1991 Lincoln Town Car air conditioning

Tiny
PURRPLEDRAGON
  • MEMBER
  • 1991 LINCOLN TOWN CAR
To

imcool@imcool. Com

Hello, My name is Jack and I have a problem with my 1991 Town car, and I don't think that you will be able to find out the problem. This will take some time to explain this, so here goes. Seven years ago I had the air changed over to R134 and since then have had nothing but head aches. First it would freeze up the evaporator and would loose air flow. The compressor did not cycle and the dealer told me it was not supposed to. I have had several people tell me it has to cycle, and some tell me it does not. To make a long story short I will fast forward to the present. I have gone through 4 compressors and have changed everything [ cycle switch, orifice tube, dryer, new hoses, muffler ]. The only two things I have not changed is the evaporator, and the condenser. We cannot get the compressor to cycle if it is supposed to. We put the gauges on and all the numbers are fine. We are at a loss, and are pulling our hair out. I have changed the fan clutch thinking this would solve it, but no it did not. I have had it at Lincoln and THEY could not find the answer. We just do not know what to try next. It will be something stupid. I will appreciate any tips you could give me to check on, all though from what we have already done I don't think even you might not be able to help. Thank You in advance for your help. Jack, I told you this would be a hard one for you. We just can't get the compressor to cycle and if you can find an answer I would gladly donate to you. Thanks Jack
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Wednesday, September 25th, 2013 AT 7:46 AM

7 Replies

Tiny
HMAC300
  • EXPERT
That's because any time you open an a/c system it has to be evacuated then recharged. You have to get the moisture out and you are jus t putting more back in. Have a local pro look at it.
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Wednesday, September 25th, 2013 AT 9:30 AM
Tiny
PURRPLEDRAGON
  • MEMBER
We have done this several times and also flushed out the system twice. I have had 4 techs look at it and they still can't find out why the compressor will not cycle. If we can find this out the problem will be solved. The system works great and cools the car down till the air temp gets to 22 degrees, and the evaporator and dryer freezes up. Thanks Jack
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Wednesday, September 25th, 2013 AT 9:45 AM
Tiny
HMAC300
  • EXPERT
Freezing up is caused from moisture in the system obviously they don't under stand no way shodu it go to 22 degrees is it auto temp control or manual because it's whole new ball game with that. Also when you put R134 into a R12 system it takes 80% not what is said on sticker or what it calls for. Also if the air gap on clutch isn't set correctly it won't engage and there is a little black box by rad that also controls the ac clutch I think i't s been a very long time.
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Wednesday, September 25th, 2013 AT 12:56 PM
Tiny
PURRPLEDRAGON
  • MEMBER
Thank you for your time here, I greatly appreciate your input. I have auto climate control. Is there something we are missing here? Is there something in the controls that has to be looked at. You would think that the people at Lincoln could find out what is the problem is. There is something so small we are just missing. Thanks Jack
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Thursday, September 26th, 2013 AT 5:58 AM
Tiny
HMAC300
  • EXPERT
I fit's freezing up it'running to cold and has moisture in it. Check the things i've suggested. If you decide to evacuate you must get 28" of vacuum for at least 30 minutes, do a Freon sweep then evacuate 15 more. Being auto temp there are a multitude of things that can go wrong. In car/outside car temp sensors. As well as your control unit in the car. And no the guys in the dealer wont' know because they aren't hat afamilar with R12 for one, the car is 22 yrs old and they aren't familiar with those systems. The air temp on this car shodl be no colder thatn 40 degrees when cooling if it is ti's to cold. I really think you have a moisture/wrong mix of Freon problem. It should never freeze up if it's been evacuated and had the correct amount of Freon put in it.
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Thursday, September 26th, 2013 AT 7:12 AM
Tiny
PURRPLEDRAGON
  • MEMBER
You gave me an answer about in car/outside car temp sensors. As well as your control unit in the car, what should we check inside the car. I s there a sensor on the ACTC in the dash. What about the ambient air sensors, those are located on the front of Rad? I showed my guy your response and he said he would check on the in car sensor. We are not giving up on this till we can figure it out. I can't let this beat me. Thanks Jack
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Thursday, September 26th, 2013 AT 11:28 AM
Tiny
HMAC300
  • EXPERT
See pics ihave no further suggestions for you.
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Thursday, September 26th, 2013 AT 12:14 PM

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