Tony - let me know if it holds. I changed my amp (but did not change the servo) about 3 weeks ago due to the same problems you were having. Today, it started back w/ the same thing - hot air out of the side vents, no matter what temp I set it on. Just like before though, it is intermitent. If I turn the A/C off, it sometimes blows cold when I turn it back on.

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Kip

1966 230SL
1969 300SEL 6.3
1985 300TDT
1990 350SDL
1992 500E
2002 SL500
2008 GL320 CDI