Date registered: Sep 2007
Vehicle: 99 Merc S420 (80k Mi) 07 Lexus LS460 (21k Miles)
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Well, your first mistake is the belt dressing. Never ever use belt dressing. It makes the belts run well for about a day, then after that they start slipping even worse then dry out and crack.
Have you had a mechanic or an A/C shop look at it? There are about 100 things that could be wrong. Going down the entire list without seeing the car in person is impossible.