In this video, we replace the thermostat on a BMW 3 Series 328i (F30/F31/F34) after getting the fault code (Bleed Process Included):

P0597 – Thermostat Heater Control Circuit / Open

This code usually points to an electrical issue with the thermostat heater circuit, and it can cause slow warm-ups, poor heat, and cooling system warnings.

We’ll walk through the replacement step-by-step, get everything back together, and make sure the car is running properly again. Bleed process included as well!

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Hochgeladen am 12.02.2026   Problem melden   Dieses Video bei YouTube   SK2K TV bei Youtube