UnitLandy said:

Ha ha. I'm reluctant to do so as it's a right pain in the backside to put back on again. As it happens I've got a hairline crack running along the plastic outlet pipe on the radiator. What's the best remedy for this. Araldite?

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Whys it hard to put back on? Remove it and wedge it away from the pullys with something, I used a piece of timber I had lying around.
No need to remove it completely off the car.

Will it not mark or damage the radiator grill pressing it against it. I'd also worry about the wood vibrating lose.

I can't remember the details sorry. But I remember it felt very secure with little effort. I had the same issues as you and I was trying to set modulation with a frost on the ground! Taking the fan off was the only way to get it hot, temp does climb fairly quickly so keep an eye on that whilst checking modulation on the nanocom. Annoyingly, temp and modulation aren't on the same screen on the nano but you know that I guess.