apb

when hot outside, and especially if car was in the sun for a while, the ac unit will reset itself. What most often happens, is that when I hit the brakes fairly hard, the recirc light will blink on the display and temperature settings and fan speed will return to the setting when I first started the car. The blower shuts off and then turns back on. I do not have error codes in the ac unit. Only thing that helps is to disconnet instrument cluster, and reconnect, I am then good to go for a while. I NEVER have the problem when cluster is disconnected. And, before you ask, I one changed instrument cluster and the problem still occured. Any clues? Is this the type of stuff a tech can figure out, or am I in for a run around?

Thanks!

Musikmann

If the tech has the MB Star diagnostic system he can probably figure it out.

ohlord

loose harness or fault wire something is shifting with the brake force G's and losing power for a short period.
You changed the cc unit,have you inspected the plug harness and wires?

apb

I have not changed the climate control unit. I did change the instrument cluster but all the connections appear just fine... And I do not get fault codes from my cc unit when retrieving then on the display...