W204 Coupe Heater Matrix

Page may contain affiliate links. Please see terms for details.

OnIt1969

New Member
Joined
Jul 29, 2018
Messages
10
Location
UK
Car
C Class Coupe 250 cdi
Hi

I've searched online for an answer to this issue and have only been able to learn that there isn't an obvious answer.

Now that the weather has turned cooler, when I start the car from cold, there is a rushing of water from behind the dashboard.

I had a similar years ago on a different car and was down to air in the cooling system trapped in the heater matrix.

Similar questions raised online have suggested there is no special mechanism other than to run the car until up to temperature with the reservoir cap off, massage the radiator pipes and top up if required.

I've tried this twice now, once on the flat and once with the car pointing uphill however the issue still persists.

Can anyone suggest anything additional I can try?

Thanks.
 
I've no idea on merc but had the same issue on an old A4, there was a pipe in the engine bay with a bleed valve, I just purged the air out and it worked fine.

Sent from my SM-G960F using Tapatalk
 

Users who are viewing this thread

Back
Top Bottom