93 190E heat issue

Hello all,
I have a 1993 190E 2.3L and have very litte heat in the cold winter months. I recently have changed the heater valve, the auxiliary water
pump, the thermostat, all to no avail. The engine temperature reads 80C or above all the time even at highway speeds and on cold days. One thing I did notice is that with the engine temperate at 85 C for an hour or so the heat gets a little better in the cabin. This makes me think its a plugged heater core, which I have repeatedly back and forward flushed. A couple of years ago the flushing of the heater core seemed to make a difference, now it doesn't.
Any ideas. Is it the climate control system?
Chris
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What happens if you use full defrost button?
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The heat is controlled by mixing hot and cold air through some airflaps. I know the manual heat system is cable controlled, and I think the climate controlled version operates through vacuum actuators.
If heater valve and heater core is OK, the hot air should also be OK. But if it isn't mixed in correctly, you will never get any use of the hot air.
This could be a path worth tracing.
CP skrev:

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So you're saying it may be the climate control unit...
Jens wrote:

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No, I say it may be the airflap actuators.
It could of course also be the climate control unit, which does not tell the airflaps to provide hot air. If so, the most probable reason is, that the thermo sensor tells it is warm enough, or that the unit does not work at all.
CP wrote:

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