It required a complete head-job at less than 76,000 miles.
It required a new water pump at less than 76,000.
It required a new battery cable at a cost of $130!!!
This car started over-heating two months after I purchased it and I have spent over $1000 trying to correct the problem.
It is now in the shop, to the tune of $1300 for the head-job.
The interior is comfortable and trips to Las Vegas have been very nice (if you don't count worrying about the vehicle over-heating!).
It is roomy and the little extra touches are wonderful. My friends and wife love the individual reading lamps.
I've not owned a New Yorker from the model year of yours (or any for the count). However, I've seen the design from 1994 on, and it leads me to believe that your problems are a result of the poor design. I sympathize with you, and do recommend that if you buy another New Yorker, look for one that is from between the years 1989 and 1993.
I also have had a great deal of problems with my 1995 New Yorker. I bought it in November of 2004. 3 months later I put a new engine in it. 3 months after that I put a new timing belt, water pump, and tensioner in it. I've put new inner tie rods in it. I've put a new rad in it. And, for quite awhile now, its been overheating. Being summer I find it best and safest to drive with the thermostat completely removed, as it overheats anytime. 2 sensors come on (ABS brakes and Traction control I think), the fuel sending unit is shot... the a/c compressor is seized... the cruise control only works half the time... I would definitely NOT recommend this car to anyone.