Compressor stays on

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Compressor stays on

Postby nyr1mess1 » Tue Jan 23, 2018 10:48 am


I have a 1990 lincoln lsc. Original suspension. Car ony has 48000 miles on it. The compressor stays on and the ride is very stiff and jumps when going over bumps. Anyone experience something like this or knows of a solution to it. I called the dealer and they have no clue. Any suggestions of what I should be looking at. Really want to keep this car original.
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Re: Compressor stays on

Postby CDW6212R » Tue Jan 23, 2018 11:27 am

Hello, welcome, and under normal conditions that will not be a fun repair. But it's most likely something simple and not the reliable control module etc.

What is the ride height, is it normal, high, or too low? If the ride is clearly off, then it's not going to be the module or compressor(those are very reliable). But the compressor is not a constant duty unit, don't let it run too much. That will kill it soon.

If the ride height is about normal, shut off the system(and compressor), and see if the air springs hold air properly. Normally the springs should hold air for months or longer. At this age though, most of them will lose air very slowly, the fronts more likely than the rears.

It's a good idea to inspect all of the parts of the system, and replace the o-rings in the solenoids etc, and even bake the beads in the air tank. All of this is described here, most in great detail with pictures. You should be looking for any damaged or disconnected parts. The o-rings get hard with age and eventually will begin to let air pass. Your problem may not be those are other common maintenance items, but it's all worth doing for a car of this age, and your value of it.
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Re: Compressor stays on

Postby beek0 » Tue Jan 23, 2018 1:16 pm

Sounds like it could be a stuck compressor relay. The control module should turn off the compressor after a certain amount of time.
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Re: Compressor stays on

Postby 2manymarks » Wed Jan 24, 2018 1:36 am

beek0 wrote:Sounds like it could be a stuck compressor relay. The control module should turn off the compressor after a certain amount of time.

yeah, about three minutes running and the compressor should cycle off. Like Don said, if it will fill the springs, shut off the switch in the trunk and see what leaks down. 8-)
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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