GL Class (X166) 2013-2015 after facelift became GLS (X166)

Rear heater coming on full blast when accelerating or braking

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Old 11-05-2018, 08:35 AM
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2014 GL 550, 2014 C63 507 edition
Rear heater coming on full blast when accelerating or braking

I have a strange issue with the 2nd row heater periodically coming on full blast when braking or accelerating. It even comes on when the rear climate control is shut off and when the entire climate control is set to off. Anyone else have this problem?
Old 01-14-2020, 04:15 PM
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S320 (W221) - S500 (W221) - S350 (W222) - SL63 (R231)
S500 crazy rear AC

Hello, I recently buy a S 500 (W221) with four zone climate, normally it’s configure in Auto and Mono mode; and I have the same problem. For no reason, the rear AC fans sound at maximum speed, inclusive with the car off and close. Have yo solve it?

Than you, 11lacu11 from Spain.

Last edited by 11lacu11; 01-14-2020 at 04:22 PM.

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