I just got my a/c working (see no compressor engagement thread). I was very excited on my way to work that the a/c was working great. It was 101* when I left work this afternoon and the a/c was still working great (had climate control on auto and max cold). I stopped by the bank, and when I got back in and started the car it was just blowing hot air. I popped the hood to be sure that the a/c compressor was running - it was. I tried several different settings and the fan speed would change, but it would just blow heat. I noticed that when I moved the temp wheel from max heat to max cold that I could not hear the relays like I normally could. I took apart the ccu to see if it had any cracked solder joints, etc, and everything looked ok. I have only had the car for a couple of months, and have noticed that the climate control would sometimes do weird things. It never seemed to blow that hot, even on a hot day. Today it was very hot. Do these sound like symptoms of a bad climate control unit. Or, is there something else in the system that could be causing similar issues? Thanks for any help.

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1985 300D 296,000 miles - Project "Rusty" 1/4 mile in 19.9 sec @ 71mph. It's almost rust free and water proof!

2006 Dodge/Cummins 6-Speed - 670HP 1159ft/lbs