Zero? But the graph you posted shows 5 or 6 degrees?

No. It’s Freelander 1 facelift. I saw this post and assumed it was all TD4 engines? https://www.landyzone.co.uk/land-rover/freelander-1-smoke-on-start-up-td4-05-plate.315783/page-2

Reading the manual shows that in the event of a faulty coolant sensor the system will fall back onto using the ambient air temperature.

Yes. She’s familiar with diesels and I’ve done it myself.

Sorry. I know this has no doubt been asked before but I’ve searched and can’t find an answer. Daughter’s TD4 has no glow plug light showing at the self check position. All other lights show, but not the glow plug. It’s a poor starter from cold so suspect there’s an issue. If it does Illuminate...