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It’s so rare for head gasket failure on these I think start with the basics:
Have they really replaced the thermostat along with the water pump?
Check power supply is getting to both.
Once warm feel top and bottom hoses of radiator to see where the heat is?
Is the radiator blocked?
Never heard of this on an E90 and some of my
Ones have been up to 200k miles but worth checking.
Sniff test of coolant would give immediate clue.
Compression test across 6 cylinder next step.
All fairly easy to do before selling it for spares.
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