I did my coolant change today. Same problems with the fans not kicking in bit all seems fine. All the pipes are hot, heaters are hot and engine temp is fineNo not overheating.
And yes I switch on the heaters and the radiator fans kick in.
Been out and give it a boot but it must not be getting hot enough. Running fine.
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I didn't drain by the plug on the block. I cheated and took the bottom hose off the rad. It took just over 6 litres of coolant so its as good as new
Also cleaned the egr valve too. That was a much simpler job