Are the threads on the coolant switch supposed to be "lubed' with anything before they are installed? I found some coolant sitting up around the fan switch. When I removed the switch, the threads are pretty clean and I can't remember if they were that way when I installed it awhile ago.
Posts: 1300 From: Clovis, California, US Registered: Sep 2007
Nothing is supposed to leak. So if it leaks, i suggest putting some teflon tape around the threads. it can stand heat, because i have some around my coolant temp sensor, oil drain plug, and it's doing fine in both places.
Posts: 7763 From: Royal Oak Mich Registered: Dec 2002
That is pipe thread, gets tighter as you turn it in, perhaps you could give an extra 1/4 turn. The sender needs to ground out to the engine, yes you can use a little tape or liquid sealant but don't go crazy, it has to ground itself.
Posts: 6939 From: Dickinson, Texas USA Registered: Nov 2006
The sharp metal threads have no problem making electrical contact whatever you use to seal the threads. I prefer to use teflon tape because it's easy to apply, but teflon-based pipe dope works just as well.