I have a G2 wagon 1994 with a vulcan and I have no heat, I tried to solve this with the following repairs: Thermostat, water pump, and a basic flush. The heater core hoses are hot and warm to the touch sometimes, and others its hot and barely warm. However, I think that my blend door is not working. How do I get to the blend door to move it. I have looked up under the dash to see if I see a lever moving and when I change the temp, I see nothing moving. Any suggestions, please help!