My 85 Euro 16V has a steady 1100rpm idle. Problem is, the minute I turn on the A/C rpm's drop and car stalls. The only time I can use the A/C is when I'm on the interstate. Does this symptom usually indicate a bad sensor or relay? Any advice would be greatly appreciated.

mrossipir@yahoo.com

I believe your car is equipped with an A/C idle adjustment sensor...does what it says, adjusts the idle when it senses voltage at the compressor. Don't know much detail after that, location, cost, incidence of failure, etc.