Your 89 New Yorker has a peice of trim at the bottom the tail light, in that small piece of trim is a screw. Take that screw out and you can get to the rest of the screws that hold the tail light assembly in place, Oh yes most important you must have the trunk lid raised so you can get to the wiring harness.
The entire dash and the HVAC housing.
The valves on all engines in a 1989 Chrysler New Yorker are not adjustable. The hydraulic lifters are self adjusting.
On the 3.0L, yes.On the 3.0L, yes.
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check your distributor,you may need to replace
Transmission in need of SERVICE.
It is part of the pump module in the tank.
They are on both sides as well as the rear.
It doesn't have one. Chrysler uses relays to controll the fuel system.
It uses regular old green antifreeze.
It is under the housing where the upper radiator hose attaches to the engine.
It is inside the HVAC housing behind the glove box.