Likely a leak in the system, like one or more of the air shocks are leaking.
12 volts...max 13.8 volts
They run best on premium but you could get away with regular but the MPG and the performance will suffer.
It comes on long enough for the shocks to fill up and then shuts off. Is your car raised when it shuts off? If the shocks are in good shape without leaks, that's usually the time the compressor takes to pump up the shocks.
It is normal for the a/c compressor to run with the mode switch set to defrost or mix. The a/c system dries the air for more efficient defrost/defog.
I have two 1994 Lincoln Mark VIII's both get around 18 to 21 MPG city and some HWY. straight HWY they both get around 30 MPG. I also run 87 Octane no Alcohol Gas. Alcohol in the fuel will drop my mileage 4 miles to the gallon instantly. drl
It is possible that the plastic connector is melted, you can get one from auto parts store but it is better if you hard wire it .
There was no 1992 Mark VIII. The Mark VIII started production for the 1993 model year.
car may turn over but not start; fuel gauge might be off; car will run ragged with little power
225/35/20 is what you would be looking to run 5x108 bolt pattern, which is pretty much a ford pattern. they used it on Volvo, tarus/sable, windstar,escape, Lincoln town car, conti, Ls, mark, Volvo s40, Jaguar XJ
More than likely low of refrigerant. Have it checked by a professional, with the proper tools and knowledge. if its cold its to assist in heating the engine to proper temp, or you have your ac on
Could be the crank sensor, pass. side down by the air cond. compressor or the cam sensor, drivers side behind the power steering res.