I run a V8 and my fan doesn't even turn on on my driven to work and home - the moving air while you drive is all you need. BUT if you are on the trail and it does you are screwed, like I was last weekend. Luckily it was a connection but I did blow some sort of seal from overheating because now I leak antifreeze daily - I need to fix it and I am HOPING it is just the tstat housing gasket but it might be the timing cover..