Threedogs motor thread

[Bob]

Correct John. I spun the hub with no fan on it. I did it to check if it was lose. There is a procedure to check if the hub is engaging or not but I can't remember tbh how it goes. I'd have to look it up.

The following taken off another site


Re: How do I test a viscous fan hub?

Without taking it off the vehicle, the fan hub should be locked up for about 30 secs to a minute on start-up from cold, then it should let the fan free-wheel until the temp rises above normal; so if you start it from cold and watch/listen for that 30-60 secs of engaged fan before it slackens off, then leave it sit there on a fast idle for a while with the heater on high (A/C off), maybe even put a piece of cardboard in front of the grille/radiator to limit air flow & encourage it to reach operating temp & then go over, the fan should cut in again and you should be able to see/feel/hear it when it cuts in again. Let it do it's cool down thing & then shut the engine down, the fan should stop pretty much straight away if the temp is at or above normal, if it spins on for more than one rotation on shutdown or you haven't been able to see/feel/hear the airflow increase as above, the viscous fan hub isn't doing it's thing properly.