Re: destroyed impeller
That sounds like a good idea, but not sure how to go about cleaning the heat exchanger itself (the coils). I am usually an advocate of not fixing it if it is not broken, but you make a good point. I will have to dig out the engine manual to see how to remove the coils of the heat exchanger and whether it is worth that effort. After a little searching it seems I do not need to remove the coils to de-scale them. I can soak them in place with a chemical and then flush. Sounds like a good idea.