Having some issues overheating in warm traffic conditions I took the XJC back to the garage (Jaguar specialist).
He diagnosed a shot viscous coupling as the fan spun too freely so proceeded to replace the Torquatrol unit. While he was at it he replaced the thermostat with a 78c one.
Sure enough the engine runs a little cooler now, even in traffic, temp did not budge (now a bit below the centre of the gauge).
Problem solved? Later on I tried turning the fan by hand when cold and was surprised that it didn’t spin much at all. My understanding from other posts is that it should spin by a turn or so when cold and very little when hot. When giving some revs I can hear the whoosh of the fan now, although this is relative to before when perhaps it was too slow.
So I am a bit puzzled - this is a brand new Torquatrol, does this sound right? Is it badly adjusted somehow?Maybe it is just stiff when new?
Appreciate any comments. I don’t really want to make a hole in the bonnet.
XJC 4.2 (1975), Canadian spec