Thanks Paul, now I'm not sure what's up, everything was working fine this morning.
Did a little reading in the climate control manual last night and found the Ohm values for various temps, so I plan on testing. This morning when I headed to work, I had the system set to Auto, and it started blowing hi fan and the fan promptly started slowing in stages. Outside temp was 62*F, dial set to about 20*C and the system put out warmed air until reaching the dial setting, then began softly blowing comfortable air with the A/C thermometer reading ~70*F.
Only thing that changed, other than my removing the sensor to look at it, was I cleaned it out by blowing thru it. There was a fairly thick layer of fine dust coating the inside. The resistor (or whatever makes up the sensor) was also coated in this dust and it took a shot of compressed air to get clean. Perhaps the dust was acting as insulation??
We'll see how well everything works this afternoon when the temps are in the 100's.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.