whats estimated cost to repair air suspension? ??

It will be expensive depending on what the problem is. The good news is you can get rid of the problematic air suspension and convert the car to conventional suspension which is probably cheaper.

It depends on what is wrong with it. The rear air suspension on these vehicles is very simple and easy to work on. The most likely point of failure is the air compressor which is located under the air filter box and is easily replaced. www.suncoreindustries.com and www.arnottindustries.com has the parts available for these cars. The conventional suspension conversion can be done, but rides different than the air suspension. The 2 websites I listed above carries the conversion aslo.

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2005 Lincoln Town Car. New compressor on sale eBay $85.00. The freelance mechanic charged $100.00.