I have a 1994 saab 9000 cse, it is a 2.3L non turbo 5speed with 103000 miles. The engine is a swap with 135000miles on it. I am having problems with the heat. There is no heat in the car at all. The front blowers are so weak that you cant really tell they are blowing anything and the rear blowers blow ice cold air all the time. could it be that both my heater core and blower moter are bad, or some other problem??