Trying bleeding and rebleeding at the stat housing valve with the engine ticking over.
Will that be a back/reverse flush ?New thermostat,water pump.I'll flush the matrix out this weekend. Thank you
Is the engine running any cooler than before, if so the thermostat could be stuck open, rare I know.
Are the pipes to the heater matrix hot as they should be, "very warm" how hot is that? I only know cold, warm or hot.
Then there's the blending dampers, is the heater output the same on both sides with the controls set equally?
What I have noticed is from start up when I go to work ,The engine temp gets up to just under halfway quicker than it used to. The pipes are hot
Obviously there will be a temperature difference between the two pipes, but noticeably ? Both should be hot, did u have the fan blower on full.
The flow-in pipe will be the very hot one.
Turn the blower off how's it then? if the same it seems if the water isn't flowing through the matrix, but there's only one way to find, disconnect the return pipe and check the flow.
Might be worth flushing again in another week or so,might be more black crap to come out yet