inside aircondtioning blower will come on when switch on, then go off for a few. on 2005 Chrysler Crossfire

When switched on, inside air conditioning blower shuts off for a few then comes on. Strange, but both seat controls work off and on also. seems like after a few minutes they work, or don't work...

I'd recommend finding a shop that specializes in Mercedes. The Crossfire is basically an early SLK with different bodywork, and most Chrysler techs will be lost on it. Be prepared to pay a Mercedes-sized repair bill, too.
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This may sound highly improbable but I appear to have cured the same problem by just fitting a new cabin air filter - 10 minute job, having only bought the car last year with 65000 on the clock I doubt the filter had ever been replaced before.