190E Heater problem

I have a 190E (2.0 Petrol) that has developed a problem with the heater.
With the cabin control on 'hot' the air coming in is cold even though the
engine is operating at the normal temperature - so the thermostat is OK.
The only thoughts I have is that it could maybe be an air-lock or a faulty
control or a blocked matrix.
Anyone experienced similar problems?

Many thanks,

Ron

My 190E did the same thing - there is a valve up front of the pipe leading
back to the heater core that is supposed to open when you call for heat and
close otherwise that went kaput. I replaced it and the new part didn't last
long. I got frustrated and put a manually operated plumbing shut-off valve
in line. Now I just leave it open during cold weather and close it when the
weather warm up.

From: "Ronald Price" <ron.price2 (AT) virgin (DOT) net
Organization: Virgin Net Usenet Service
Newsgroups: alt.auto.mercedes
Date: Sun, 12 Dec 2004 21:49:22 GMT
Subject: 190E Heater problem

I have a 190E (2.0 Petrol) that has developed a problem with the heater.
With the cabin control on 'hot' the air coming in is cold even though the
engine is operating at the normal temperature - so the thermostat is OK.
The only thoughts I have is that it could maybe be an air-lock or a faulty
control or a blocked matrix.
Anyone experienced similar problems?

Many thanks,

Ron