I find that oil coolers must be almost entirely blocked off in the winter to get the oil temp up to the desired 180F. Here's a mechanism I made for adjusting the door on my EZ oil cooler and a different style door on the Cozy. There are probably better ways to do it but you will likely need something that is adjustable. The EZ door adjusts by a screwing a nut sticking out of the opening. The Cozy door slides.
One time I flew a cross country without opening the Cozy door enough. The oil cooler got hot, melted the plastic gear on the vacuum pump nearby and I lost my vacuum instruments! :-(
Also, my kit for bleeding brakes. Suck the old fluid out of the reservoir with the syringe and pump the new fluid in from the bottom. Takes about 30 pumps per side with this rig. The wood piece keeps the pump from turning over.