M20 over heating with new viscous fan

[E30rocknrollstar]

M20b25 pre face lift cooling system.

Gauge sitting at 1\2 to 3\4.

new water pump
new thermostat 80c
new borg viscous fan coupling.

Should the viscous fan lock up and be loud on first start up as my new one does not, also i can stop the fan with some rolled up paper at over 1\2 way on temp gauge.

do you think my new viscous coupling is no good its from euro car parts so not sure how long its been sat on the shelf and dont know if its been stored correctly.

am i chasing a problem that does not exists im thinking its bloody cold out there and my car is still getting very hot so it will get even hotter in the summer.

iv ordered a ir heat gun temp sensor to see how hot its getting.

[brutus]

pls dont quote me, but ive heard there viscous are not good enough,,,

[E30rocknrollstar]

Really it was £ 80, they was a cheaper one for £45

thought it would be pretty good quality for that price.

[Brianmoooore]

Viscous coupling should not lock up on start up or at any other time until the engine just begins to overheat, but new couplings are often noisy for a few hundred miles, until the centre bearing loosens up.
Under what conditions do you think your engine is overheating?
Have you checked the small brass nut on the back of the instrument cluster, right behind the gauge, is secure?

[Yeti]

air lock id say there a bitch to bleed sometimes.

[E30rocknrollstar]

just to let everyone know because you will all be worried and will not sleep at night my car was not even over heating its just the temp gauge when i tap the dash above the clocks it goes back to half way.

Need to tighten the brass nut on the back of the gauge from what iv read on here.

[Brianmoooore]

Have you checked the small brass nut on the back of the instrument cluster, right behind the gauge, is secure?