[AlanJohnson]

I have a weird intermittent coolant leak at the top of my S60 engine. It doesn’t usually leak when engine is running. I’ve taken my closet floor up and there are some hoses up there, a few fittings screwed into things and a valve with a knob (like water spigot). 

My big plan was to get a kit from autozone where you put on a special radiator cap and pump it to pressurize the system and see where my leak is. That all went south when I realized I could not fit the special radiator cap inside the little door on the side of the coach. 

Any ideas on how to easily pressurize the system to find this leak?

Thanks
Alan