Join Date: Dec 2017
Location: Ballwin, Missouri
Jamie, my first question to you is,"are you mechanically inclined"? If no, then expect to spend much Wampum bringing the piece of Art back to life.
If the answer is yes, then here are the things you will learn about.
Restore the door locking mechanism,
repair the window lift issues,
send off the speedometer to be repaired. (I just did this for one of my cars cost $300.00 US)
car has a hydraulic issue, may be easy, and may be expensive, spheres at a minimum, shocks possibly, and more than likely springs if car is sagging,
With the hydraulic system in dis-repair I would high suspect the brakes are in dire need of attention, this includes hoses, rebuilding all calipers, pads, possibly rotors, and hopefully not the accumulator valves and pumps.
Th Air conditioning system is another issue. You have 3 major systems combined into one, refrigeration, heating, and ventilation. They all interact with each other, If the controls are wonky, they have to be worked out first. My understanding of the system is the AC is always on, with the heater tap varying as needed, the control module controls a series of flaps to blend the cabin air to the temperature set by the operator controls. If the fans are not working, or you have dirty fins on the evaporator coils, or the flaps or hung up due to worn out bushings, then the results are not want you want. The heated tap is another source of concern, then comes the refrigeration system, many issues may reside here, but be sure your inside components are working before you tackle this problem.
I own an 88 Corniche and an 89 Spur, love them both, have put over 60K miles on the Spur, but these issues have all been resolved. The 20,000 series cars are great cars, but can be very expensive if you have to take it to the shop for all the repairs.
Good luck with your purchase.