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CLK heating blows cold on corners

5824 Views 11 Replies 4 Participants Last post by  keyhole
My 2003 W209 CLK 320 heater blows cold air into the cabin when I go round corners. Any ideas please? I take a route to work with lots of bends and as it's starting to get chilly in the mornings I'd really like to put a stop to it.

Thanks Oliver
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It could be a problem with the dampers or their servos in the ducts. Try the ACC test/reset:

With the engine running, simultaneously press and hold the RECIRC and FRONT DEFOG buttons until their indicator lights begin to blink. They should blink 20-30 seconds then stop. If they don't stop, then you have a damper control problem and will nee proper equipment (SDS) to diagnose.
It's possible there is a short in a servo that only occurs with the G-forces in corners. It could also be a defective duo valve where the coolant is routed into the heater core. For a bad part, it might not take much G-force to trigger it.
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