Heat from middle vents on auto - Mercedes-Benz Forum
 
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post #1 of 4 (permalink) Old 01-09-2019, 07:51 AM Thread Starter
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Heat from middle vents on auto

Hello all. This is my first Mercedes C300 and my first winter with it. I use the auto thermostat most of the time but notice that when auto heat is on, heat only comes out of the far left drivers side vent and the far right passenger vent. No heat comes from the middle three vents. When I turn off auto and turn up the vent speed, all 5 vents work as expected so I know the vents aren’t broken. Is this normal behavior for the auto setting? Perhaps to not blow a bunch of heat in your face? I wanted to verify before I contact MB for an inspection. Thank you for any information you can provide!
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post #2 of 4 (permalink) Old 01-11-2019, 10:08 AM
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I believe this is normal operation. My Cherokee operates the same way. You have to take it off "auto" to get the center vents to pass a lot of air.

Just my $0.02 worth
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post #3 of 4 (permalink) Old 01-13-2019, 04:01 PM
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Its normal. Mercedes has been doing this for years going back to the 1990s and even earlier I believe. The center vents only blow outside air or cooled air.
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post #4 of 4 (permalink) Old 01-14-2019, 11:40 AM Thread Starter
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Thank you for your response. Glad to hear that this is normal and will save me a trip to the Benz dealer!
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