W163 Heating staying cold

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Ssnipples

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Joined
May 25, 2015
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46
Location
Newcastle upon Tyne
Car
Mercedes ML Black 270d auto Biege leather BM E90 if I'm allowed to mention the dark side :)
Does anyone know anything about the following

My w163 a few months back heating stopped blowing warm air despite a fully warmed engine. Before I had a chance to investigate it began working again until a few days ago. Any ideas why it would work intermittently?

Not sure if it's connected but my electric sunroof has also randomly stopped working for a second time. Are these connected someway as a fault?

Thanks in advance
Steve
 
Not sure if these have a duo valve or not, could also be a Partially blocked heater matrix perhaps.
 

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