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SMOKE COMING FROM VENTS on 1991 Ford Explorer

I MADE REPAIRS HAD SMOKE FILLING UP THE CAB OF MY CAR. MECHANIC SAID IT WAS FUEL INJECTOR. I NOW HAVING SMOKE FILL UP MY CAR AGAIN - MY HEAT AIR BLOWER HAS BEEN MAKING A NOSIE FOR AWHILE, BUT NOW IT IS SO LOUD I'VE GOT TO TURN IT OFF AT A DRIVE THRU.

Asked by for the 1991 Ford Explorer
You could have debris in the plenum. Remove the blower motor and check for debris. As to what is filling up your car with smoke - not entirely sure; is it like burning smell, or just like moisture?