Radiator Fans - Constantly On

[Tin Hat]

Hi All,

i have an 87 HC Turbo and the radiator fans run constantly from cold - Can anyone point me in the direction of a fix?
 

My thoughts were that it is either the otter switch or a relay, but as has been proved in the past, I have little technical knowledge! 
 

all best,

Will

[CarBuff]

Does your HC have air conditioning?  If not that reduces the possible causes.

 

Do you have the Service Notes (shop manual)?  That will help identify any control relays or switches. (IE, the Otter Switch on the aluminium J-pipe, RF of the engine bay)

[JimmytheTurbo]

Id check the relay

[Tin Hat]

Thanks gents, yes, AC is fitted

no workshop manual, I’ll see if I can rustle up a copy

[Escape]

This is the diagram you need:

Make sure the AC is off. Next, the Otter switch is the most likely place to start. It's not too hard to unplug the , if that stops the fans, you have found the culprit.

If it doesn't, try removing the fuse or relay for the AC, just to make sure that's not on all the time. Finally I'd check the relay, as they can fail in the on position.

[Tin Hat]

Hi Escape, 

thanks for this helpful advice, apologies for my belated response, I’ve been in Spain on hols!

 

thanks again,

TH

[Escape]

A holiday is always a good excuse.

Just let us know when you find the cause and solution, that can always be helpful for other owners in future. 😉