I have a 2002 Lincoln LS, V8. At times the AC works great. I drove about 200 miles the other day. For 150 miles it worked fine. The last 50 miles is slowly quit cooling. I put my guages on it when I got home. There was about 10psi on the low and 100 psi on the high side. So I figured I had a slow leak. I put 12 oz of freon in, the pressures went right up to 40 psi on the low and 200 psi on the high. It worked fine for two days. The third day it would not work. I put my guages on and had 10 psi on the low and 100 psi on the high side. I left it alone. The next day it worked fine. Is the expantion valve failing or is the compressor failing?
Country: United StatesMake: LincolnModel: LSYear: 2002Engine: V8
added 12 oz of freon
Hello and welcome to JustAnswer.
My name is Vladimir.
If you are sure it does not have a small leak and actually loses refrigerant, then it would be more likely that you have a faulty expansion valve if it was just a typical piston compressor but your car uses a variable scroll compressor so to me it sounds more like a compressor failure.
I've been working with American made cars since 1992.
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Relist: Inaccurate answer.I have a 2002 Lincoln LS, V8. The air conditioner quit working. I put my guages on it, the low pressure was 10 and the high was 100. I put about 10 oz of 134A in and the pressure went to 40 and 150. It worked fine for a day and quit again. I put my guages on and the pressures were 10 and 100 again. I left it alone. The next day it worked fine. The next day it did not cool and the pressures were low again. I replaced the compressor and receiver dryer. I vaccumed it and put about 1.5 to 2 lbs of 134A in the system. The high side pressure is around 175. The low side is pulling 15 inches of vaccum, then the gauge went to around 30 and then it went back to 15 inches of vaccum. Needless to say it is not cooling. Now what should I do?
Good morning.If your low side is going into a vacuum then I would replace the expansion valve,which means you will need to remove the dash to access the expansion valve.I would first add some a/c dye to the system and check for any leaks.If you dont find any leaks and you do replace the expansion valve you may want to replace the evaporator core while you have the system apart.
40+ years all makes and modles
Could I get a diagram of the dash area?
I am having trouble with my PDF file so I will opt out and another expert will assist you.Good luck with the repairs,Don