Not sure if this is the right place to post, but here's my issue:

The AC on my 2004 300M is blowing hot air, freon is not the problem, there's plenty in there. Any suggestions?

I will add, a very odd thing happened, last time I washed my car, while going through the machines, the AC was on and and the vent starting blowing soap. This can't be normal, can it?

With 90F weather here in NJ, the AC is a big necessity, any help/suggestions is greatly appreciated. I'll end up taking it to the mechanic, but having an idea of the issue does help.

Than you.

 

Not "normal" for soap to blow out the vents for sure. Car wash may have loaded up the fresh air inlet under the wipers but the drain tube at the base of the fire wall should have prevented that. Check the drain for obstructions.
Are you sure the Freon is not the issue? Does the compressor run? Unfortunately as these M's age we see many evaporators fail.