The cabin air sensor on my 82 380SL is not working. I have tested with a multimeter and there is no measurable resistance. Unfortunately part # 1238300572 is no longer available. When I plugged in the temp sensor from the heater box, I started to get blower motor function. The holder is fine so I was hoping to substitute a different thermistor, but need help with the specs of the original. Any other ideas would be greatly appreciated.