This AM I experienced some strange behavior from my 88 300E climate control. The system was in it usual mode, fan on auto, temp set to 22 degrees C and the Econo button depressed. I was getting high temp heat out of the dash, no fan and the light in the recirculation switch was blinking. Changing the fan, temp or outlet settings had no effect. I shut the engine off and restarted it now everything is working normal. What does the blinking light in the recirc sw mean? Is this a sign of a pending future failure, or is the 300 just jealous of the new C 230 I just acquired and wanting more personal time with me?

The blinking light usually means, that the voltage is too low to provide proper functioning of the system. If you have ever seen the rear window defrost light blink, that indicates the same problem. If you have a lot of load on the alternator, you will see this happen.

Thanks Jeff
I will check out the charging system and contacts to the Climate Control Module this weekend. It worked fine this morning but I could have a loose connector.