Test Date: June 16th, 2006
Test Course: 68 miles of highway, city and then highway driving around Fresno CA.
Test Conditions: 90-96 degree California summer heat (dry).
The next stage of the test was a return to the freeway. Unfortunately no photos given lighting conditions. Speed was around 70. Temp settled VERY slowly to 12 degrees above ambient despite the steady speed and slightly reduced temperature (90 degrees). Got the idea of shutting off the fans and temp almost immediately dropped five degrees to 7 above ambient, where it stayed.
Surprise conclusion from this test was that a manual fan activation switch works well at slow speeds in the city, but on the highway it blows engine-block-heated air into the intake in place of ambient incoming air.