Fans switching on fine but they wont switch off…………….

[Whiplash]

………until the ignition is turned off.

I think this is the cars way of dealing with the current hot weather we are enjoying in the south but 'her in doors' believes it is a warning of impending doom.

Any ideas what would be causing this?

Oh and the car is a 4.5ltr 1997 if that makes any difference?

[TJC46]

Could possibly be a faulty otter switch,or relay switch.It may sound obvious but Check the coolant level is correct.

[rigga]

As they stop when the ignition is turned off,and not run initially till the temp reaches the correct point id guess a sticking relay,as if the otter switch was permenantly bridged the fans would continue to run.

[captaintact]

If in doubt change both relay and otter switch. Cheap and quick to do and lot cheaper than the alternative!