MY NC Fairlane has a strange heating up phenomenon..

At idle or driving without air condition never heats up to over a quarter..

But with air conditioning on, at idle it heats up a little.. Just a little over half...

When im driving it cools up to about 1/3 and doesnt get hot but only at idle it heats up more..

I tried lifting the revs at idle a little as it may spin the fan and water pump a little more but then the auto gearbox gets a little more of a thud when changing gear??

Even with higher idle it still heats up a little more..

Its not heating up to dangerous levels but just more than it normally runs..

Normal or is there a fix... obviously it runs the clutch fans and thermos would be better but dont really want to change it..

I would dare say that the clutch fan is on its way out. Im not sure exactly how you can diagnose this without trying to hold it with the engine running Perhaps someone can advise on this.

I would dare to say that if it only goes as high as halfway on the temp gauge then thats reasonably normal for a belt driven fan....correct me if I am wrong anyone. It could also be something to do with the fan/belt/water pump if its not normal behaviour for your car.