Hello, Our A3 2008 bmn 2.0d keeps losing all the instrument cluster dials, this happens a couple of seconds after starting the engine.

Historically it has intermitently flashed a low coolant level warning for a minute after a cold start(level always constant on max), I replaced the coolant bowl but no change. Checked fuse 6 and fine.

I have read a post mentioning to change the coolant temp sensor but until now the temp dial on the dash had been dead on 90 when warm, so I had not thought it was failing. When plugging in a generic obd11 I can read the changing engine temp(are there two coolant temp sensors) and no codes shown. Could a faulty sensor cause my cluster issue?

Had a brief look at the loom where it passes the right side of the battery, no visable ware on outer strapping.
Looking for inspiration, I have removed cluster and thinking of sending it of for a test or repair.