Anthony - do a search on each of the listed subjects and you should come up with quite a bit of answers to your questions. Plan on spending some $$$ to resolve all of your issues with the leveling being the most costly - and this is with you performing your own wrenching. The easiest thing to fix will probably be the heater - especially since the fans seem to work.

Ain't it funny that on old cars the only thing wrong with the a/c system is that it just "needs freon" - LOL.

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Jim