1994 GMC Sonoma

Dear Doctor: I own a 1994 GMC Sonoma. My air conditioner doesn’t work because the coolant for this vehicle is no longer available. What do you suggest to solve this problem? Ermano

Dear Ermano: The old refrigerant called Freon is now replaced by R134a. It is a simple task to convert the old system over to the new R134a. The problem most technicians have is putting too much R134a in the old system. A good rule of thumb after removing the old Freon and adding the new is to fill the system 75 percent and see how it cools. If the system is working properly then it will blow cool. — Junior Damato, Motor Matters

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