If 75 landy Hitachi track hole. My swing motor,manifold union center is leaking. I would like to know how to fix it myself. Or how much it would cost to have someone to fix for me.

SOURCE: I have a coolant leak on my 1994 Cadillac Deville.

Yes this models tend to do that, check the coolant mixture after repair, yes is a diy proyect but you at least will have basic mechanic abilities to perform this, make sure you mark all the hoses and cables when dismantling.

SOURCE: had a mechanic try to fix exhaust leak @ manifold,

If you think that the angled stud is stopping the manifold tightening enough to seal, an extra gasket could possibly fix the leak. If possible it would be better to **** the hole in the manifold so that it could pull up tighter on one gasket.

SOURCE: intake manifold coolant leak

the parts are about 200 the labour about 500 in my shop anyway

SOURCE: antifreeze leak from cracked intake manifold ?

There are aftermarket ones avaliable that are cheaper than the dealer, but of cousre the quality is less. , check DORMAN PRODUCTS

SOURCE: what & where is the "air conditioning manifold hose"?

it's two little hoses in on the left part of the engine running towards the front. You probably need to replace them and put refrigerant back in. not soemthing you can do by yourself.