heater slow to start

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rom1

Active Member
Joined
Jul 11, 2013
Messages
295
Location
leicester
Car
Mercedes c220d cabriolet
Noticed when I switch the heater on on hot or cold, the fans dot start blowing air straight away it takes between 30 seconds - 1 minute before air is blown out of vents, this is not normal as previous w04 was instant.

When blowing out air it is fine, does the same regardless of if its just been switched and and off again then on. Or if its first time using it that day.

No errors or noises, air con works but same issue slow to start blowing out air.

Pic of heater controls in case it helps to identify the issue

Any ideas what I should be checking?
 

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Somewhat confusing, does it blow or not?

My 203 and 219 won't blow until temperature correct unless you use defrost
 
It does blow but takes between 30 seconds to 1 minute before air is blown out of vents, does same on hot or cold
 

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