I have a 190 e 2.3 1987.

The a/c works only when the defrost button is depressed, what do you think is hould do so that the a/c button wil work.I was thinking about replacing the climate controll panel.
Your thoughts?

Does it work in other modes if you leave the fan control setting on max? Might be a problem with the blower regulator rather than something inside the PBU.

Sixto
95 S420
87 300SDL