Cadillac Repair: 94 El Dorado Cadillac leaking antifreeze, head gasket problems, oil dipstick

Question
I have a 94 El Dorado Cadillac and it is leaking antifreeze somewhere. I have had it to 4 different repair shops including the Cadillac dealership, all of them did a pressure check on the radiator and found nothing, they have all agreed it isn't the head gasket, they have replaced hoses, clamps, tightened loose clamps and so on.  I had a new radiator installed 2 years ago, i put a new radiator cap on it, i have done everything that was suggested and i still have to put antifreeze in my car once a week to keep it from overheating. Can someone please give me some ideas on what the problem could be? Thanks

Answer
You only have 2 issues. You are either LOSING the anti-freeze externally or you are USING the anti-freeze INTERNALLY.

Spread some newspapers under the engine on the ground when you park it for the night and see if there are any colored stains on the papers the same color as your anti-freeze.

Check your oil dipstick, Is it OVER FULL on the stick ?>

The only other thing is that the engine is using it internally due to a gasket leak and it is being burned by the combustion chambers which is a major problem with Cadillac engines.

The only other test is to remove all the spark plugs and introduce about 80 to 100 lbs of continous compressed air into each combustion chamber and see if you can see any bubbles coming from the removed radiator cap. If you see bubbles, You have a head gasket problems. may be several small leaks in the gaskets .