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Assuming that the car was for prolonged time in service with an damaged turbo line I think of the following possible scenario: Normally a diesel is running lean (more oxygen than fuel). Since the split turbo line allowed metered air to escape, the combustion went rich (less oxygen than needed), this way the exhaust gasses where rich on soot. The large ...


2

It definitely sounds like an issue with the clutch and / or dual mass flywheel. The noise you described could be attributed to the release bearing which is part of the clutch kit. All of the other symptoms point to an issue with the dual mass flywheel.


2

If you have temperature in your cooler then it's most likely the heater mixer flaps (either servo motors that steer the flaps, or the controller). On many cars you are able to see if the servo motors work, however you will probably have to remove some trim to see it. Just google vauxhall insignia [year] heater problem, and you'd probably find some youtube ...


1

That sounds like the clutch and, yes, while it is apart do all the bits, but not the flywheel unless it needs it or it is a DMF.


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