Park avenue driver side mirror leaks oily fluid

If you have to add, you have a leak to repair first

Leave A/C work up to a shop with the proper knowledge
& test equipment/do not polute the atmosphere

Maybe brake fluid. Under the hood on the drivers side is the brake fluid reservoir and the brake lines generally run from there, under the drivers side, to the rear brakes. The lid may be loose or a line may be leaking. Would help to have someone look under the vehicle while someone pushes the brake to see if fluid is dripping.

HEATER CORE LEAKING.HEATER CORE LOCATED UNDER THE CENTER DASH NEXT TO DRIVER SIDE.

this sounds like your master cylinder has gone out, Located on the fire wall on the drivers side of the car ,, if your fluid level is good, and you detect no fluid leaks at the wheel cylinders, this is the most likely problem

SR you just found the problem a leak in the power steering system, check the floor were you park the car every day, there steering fluid by the driver side the problem is the steering rack, there is fluid by the engine passenger side, pressure line, banjo fitting, return line, and also steering rack, the best thing to do is clean the oily area, refill reservoir drive it and check for a fresh leak.

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replace the motor

if the fluid has a strong smell then its likely brake fluid .. that would be a bad master cycilnder ... if the fluid smells like antifreeze then thats a leaking heater core ... if its just water then look foor a clogged drain hose on the ventalation air intake chamber ... the brake fluid will be oily and a strong smell .. if thats the problem then it is not safe to drive until that is fixed .. you could partially or completely lose braking ... .

Could be brake fluid, so look at the brake fluid resevoir.
Could also be water from the evaporator, from the air conditioner.
Is it oily to the touch?

pull the cv axle and put a new seal in it

Check the cooler lines, they will only leak when it is running.