I have a 85 Caprice 305. I need help the engine is making a tapping noise it isnt lout but i want my engine to run perfect. I have no heat as well I'm not sure if it is the blowere or the heater core, My AC dosnet work either. On that console the only thing that works is the rear de-froster so im not sure what the problem is. I you have any tip or can point me in the right direction it would be helpful. Thanks