Cooling notes

Last week on highway cruising I noticed the Beetle's oil pressure was a few psi lower than unsual, especially for the fall season. The cylinder head temp (#4) was still in the usual range, so I was curious. Today I found the left-hand fresh-air hose from the shroud to the heater box had worked its way off the shroud, so it could blow air freely out. This would tend to lower the air pressure in the shroud, and obviously reduces the air going through the doghouse cooler, so the oil ran hotter, thinned out, and thus the lower pressure.
Curious that it seemed to affect the oil temp more obviously than the cylinder head temp; but I've heard that oil temp is more a function of engine rpms and CHT more a function of load. (You can watch the CHT rise as you go up hills, etc.)
Anyway, just a reminder that those hoses and the control flaps on the heater boxes need to be in place and working for optimal cooling. Check them when you check oil level. (Didn't help me - my bug uses so little oil I've never had to add, so I haven't checked between changes.)