post #11 of 11
That can be a problem. Top fan needs to be idling so it doesn't move air too fast. Thing is without an intake fan there will probably be no cool air flowing to cooler.

Air is a fickled witch and will often do the things we least expect. They will make sense when we analyze them but are not at all what we would have expected. Things like PCI slots drawing air into case when there are 2 front and 1 bottom 140mm fans and no HDD cage in an R4.. and only the back vent was open, top and side were closed.

I use a small cheap indoor/outdoor digital thermometer. I twist a piece of insulated wire on probe end so I can bend and position where I want it. Make it easy to check the temp of air going into coolers for example.
Processed By eBay with ImageMagick, R1.1.1.M2a