ccu help: heat out the defrost only no fan

[uplandbob]

Climate control was dead for a year. I cleaned the engine compartment with compressed air and the next time I started the car everything came to life after I heard some clicking noises by the ccu. It woked off and on for a short period then nothing. Pulled the ccu out and hit the push button pins with the solder gun and it worked a couple of times then nothing again!
So California is getting warmer and I'm not going another summer with hot air comming out all the time.. HELP!!!!
1991 300E 2.6 266,000 miles