Are you sure that you have no vacuum leaks and that the ignition switch is good? At first thought I would think that the ignition switch could be acting up?

I do not know if this would give you systems like this but have you checked teh Klima Relay? Pull it out and open it up and see if there are any cracks or not in the soldered conections? Also, I do not know if it is realated but what about the interior ambient temperature sensor? Is the intake clean, is the sensor good?

Iggy

P.S. I am not an expert, I just ahve gone through all of this before on my car.

Also have you checked to see if the push button control box in teh consul is good?

__________________
Insanity: doing the same thing over and over again and expecting different results.

2006 - Suzuki Gran Vitara (2.0 L fully equipped) Like this car so far except for trying to put on the seatbelt.
1988 - 190e - 2.3L - 172K miles (It now belongs to the exwife)
1999 - Chevy Blazer LS Fully Equiped - killed it June 2006
2001 - Honda Civic EX - 68K miles (sold June 2004)
1963 - 220S - Dual Carb 6 cyl. (sold)
1994 - Yamaha WaveRaider (fun to ride)