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Pull the glove box and replace the foam hose between the plastic pipe coming from the grille beside the sunroof switch and the interior temp sensor. Make sure the little fan down there works, too.
Also, if the hose is OK or replacing it doesn't fix things, you may need to re-solder the pushbutton control unit. The solder joints crack, and this will cause intermittant cycling -- if the switchover valves behind the glove box are constantly clicking, this is the problem.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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