I am having the same problem on my 90 300e. The climate control unit shuts down, the recirc light flashes, and hot air comes out of the vents. In addition, I have also experienced the ABS light coming on at the same time and the car seems to run very poorly when this occurs. I have changed the Voltage Regulator, and the overvoltage relay(twice). Does anyone have any suggestions, I'm not sure where to look now. Thanks in advance for your assistance.

Buffalo'd
Bigbenzman

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1987 300SDL
1990 300E
1989 300E
1986 300E
1981 300D
1983 240D