Help - coolant leak

[Sajk]

Yesterday I changed the dual temp aux fan switch in the radiator. Electrically all is good but... when I remove the old one there is an o ring in between the switch and the radiator. I reused the o ring but if the new switch is not tightened exactly right (which is not very much) the o ring deforms and it leaks. It will move with vibration and it will leak for sure.

There is no o ring shown on realoem and I cannot believe that this is the correct way to fit this switch. The radiatior was changed some years ago and the ring may have been fitted then.

Please - What is the correct way to fit and seal this switch so it's reliably leak free.

 

[t-tony]

Wrap it with PTFE tape. Wrap it against the direction you screw the switch in.

Tony.

 

[Sajk]

Wrap it with PTFE tape. Wrap it against the direction you screw the switch in.

Tony.

Thanks Tony. Should I use a rubber washer also?

 

[t-tony]

No, when you've lapped plenty of tape round the thread wind a load more right under the face where a washer would be.

Tony.

 

[Sajk]

Ok thanks

 

[Sajk]

It's done. Will test shortly
Could not find a torque setting but it's as tight as I dare given the plastic threads. Cheers and thanks for the hand up.

 

[t-tony]

Please let us know how it goes.

Tony.

 

[Sajk]

Perfectly. All tight and dry. I think the guys who changed the radiator some years back used that o ring. So I actually found a land mine in a way. At some stage it would have sprung a leak. Thanks Tony. Now for my next two problems...