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this a job for the suspension professionals
there are coil springs with the air bags already inside the coils that will fit straight in
the thing with air bags is that if inflated to the correct pressure , the height of the springs will not vary as the load is taken by the air bag and not the coil spring
for example heavy vehicles running on air bag suspension retains the same ride height regardless of the load on the vehicle
what you propose is great for towing trailers, caravans etc or carrying heavy loads on the tray at the back
early 90's Lincoln town cars have rear air bag suspension and are very prone to failure. cost of one air bag is well close to 250 dollars.
this is a inexpensive fix for that issue. it is possible to install coil spring in replace of the air bags. you will lose the air ride but the cost will be under 100 dollars for both compared to 500 dollars for air ride replacement bags.
the coils that fit are the same year grand marque ford/mercury cars. so when ordering you order for same year as you car grand marque rear springs,
after market or even dealer cost under 100 dollars. they come will the spring seat as the set.
the repair is raise vehicle and support with jack stands. disconnect the lower shock mount so that it allows the rear axle to travel down. this will need to be done for the instillation of the new replacement springs.
next you will need to disconnect the air lines that go to each air back and pull the clips holding the top of the air bag into the chassis of the car. the bottoms float free so this is all that holds them in the car.
remove the air bags out of vehicle and tie air line up and away out of the travel of the car.
install the new spring seats on the rear axle and upper chassis mount.
install the spring top first. you may need to have an assistant pull down on that side of the rear axle to get enough clearness to get the bottom in the seat. you may also try jacking up the opposite side so the side you are working on travels down easier.
after both sides are in there upper and lower seated position.
jack up on the rear axle to install the lower shock mounts back in there original position. after done lower vehicle and recheck all seats to insure they are properly seated. if so you have completed the repair.
this will take no more that two hours start to finish. if you are familiar with a car it may take even less time.
I have a 2000 Lincoln Town car, had the same problem, it was the rear air suspension/shocks. They are air bags basically that levels your car and it cost about $300.00 for each at the dealer for parts and install but it also has its own motor that inflates and deflates these air bags and I also had to replace that and that cost over $400.00 installed at the dealer.
It is possible to go with conventional springs/shocks instead of the air ride system. This has become a common "fix" for faulty air bags due to the expense. The ride will still be great, you will only lose the load leveling ability that the air bags provided.
there is a ride hieght sensor on rear lower control arms creck for damage and connection.over load rear suspention,4/5 people on back bumper with key on see if pumps up.also check fuses.try jumping compress to test compressor.worst case replace struts and use coil springs,eliminating air ride issues.
The answer to your question is yes. They do sell a replacement springs for that vehicle.You may have air bags on the rear that appear to be leaking down you might check the air lines for leaks but most the time its the bags themselves that are leaking. This could get expensive replacing the bags the alternative to this is take them out and install coil springs with shocks. They sell the replacement conversion springs to your vehicle in a set the shocks will have to be purchased seperately. I did this to a lincoln town car for a customer of mine worked out well and didnt even notice a difference in the ride. Instructions will come with it and how to disable the wire so that the air suspension light will not come on.
Save your self the hassle and expence of troubleshooting and replacement parts, install a suspension retrofit kit which changes the rear bags to coil springs and the front to struts. A car this old you might as well start over for less than $500.00......
ive had two of these they have a prob with the bags going bad and they are about 500.00 each i went too the junk yard and got a set of 16 inch recoil springs and replaced the bags with them took about an hour too do it and only cost 20.00 for the springs and the ride was even better than the bags
its an easy job too doojust pull the wheels drop the bottem part of the shocks then pull the pin out of the top of the air bags (thru the wheel wells) disconect the air line unscrew the bag 1/4 turn and its out the coil spring fits right in put your shock back on and wheels and your done and cut the power too the pump
Check your rear air springs see if they have any cracks if so the pump may be burned up since a leak will cause pump to run more thn normal and fry pump if no cracks in air springs the dealer might be the only help, also keep in mind you can replace air spring with regular coil springs (marquis,crown vic) and add some after market air shocks that you can fill with reg air compressor
Replacing the air bags is only cheaper if that is the only problem with the vehicle (which it hardly ever is). The air bags or other parts will act like a house of cards and over work your compressor and other components within the air ride system. Converting over to coil springs is definately the way to go.. eventhough I hardly ever recommend finding safety and suspension parts at a junk yard. Springs are easy to cut corners and costs on and a cheap spring can cause catastophic results. http://www.strutmasters.com offers affordable conversion kits and provides a lifetime warranty on all the kits they sell. The springs are only made of powder coated, American made steel coils that are designed to last the lifetime of the vehicle (unlike those airbags and compressor) http://www.strutmasters.com/lincoln-town-car-suspension-s/37.htm there is a direct link if it helps anybody having these problems. There are less expensive versions out there, but you get what you pay for.