[orbit1957]

The engine thermostat should take care of the block.

Keep in mind the rear of the coach is a low pressure area which naturally pulls in air from the side openings and exhausts to the rear.


No argument that less thermal stress is not better.

What I noticed when the solenoid on the fan controller failed is two things. One, it cut the fuel mileage about 1 mpg. Two, the engine was not operating at its design temp. The Detroit tstats (2 of them are full open at 196), with the fan on high all the time the engine operated in the mid 180’s.

Good to know the low pressure venturi effect of the air movement when driving is present.  Unfortunately that dissapears at low and stopped speeds. That is where a little breeze would be benificial IMO. 

I'll make a small adjustment to that fan speed adjustment screw you indicated and see if that could suffice for that no flow condition.  With some models having low and high speed fans it makes me wonder what and why Newell made changes to the system.  Was it a improvement or required by the type of engine used or both?  Would be interesting to see what other ownerst installations have. In the end it may be insignificant but my mind just works this way. The variability in the designs is interesting and wanting the best one for my baby. 

My temps are exactly in the range you described them to be.