The in between part that I guess was foam was missing on mine, probably for quite a while. Seemed like everything worked fine until a week ago. With the thermistor removed from the speaker housing and hooked up I still get no heat in the max setting, but remove the thermistor from the plug and it turns hot then. I seem to be getting a varying ohm reading from the sensor so it does operate. Do you think the temp wheel needs adjustment? I have read about ohming it out, but don't have the special tool they show to adjust the shaft to the wheel temp. Will anything else work for that? Maybe I need to look elsewhere for the problem.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan