Thanks Wino and Ken.

A/C should work better with both fans able to run at low speed, irrespective of coolant temperature. 

 

That was actually the first indication that the main fan's low speed on ours was busted; at a standstill in hot weather with A/C on, the main fan would cycle between off and on at full speed every few seconds, instead of the low speed working continuously. 

 

 

@Rocketfella - I should explain that, the way the electronics work, the fan would cut in high before the gauge would move above 90C.

So 90 is positioned in the central shaded region of the gauge or is it past it? 

2 hours ago, Rocketfella said:

So 90 is positioned in the central shaded region of the gauge or is it past it? 

Dunno; I'm used to gauges being calibrated rather than just pretty colours. But 90 is the normal position when the engine has warmed up, and the gauge is programmed such that it sits at that position until the engine temperature goes over 100.

Sounds reasonable