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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).
Testing Instruments
- A $20 'wireless' thermometer purchased from OSH.  Wireless = a remote transmitter that is connected to a wired temp sensor and reports to a second unit, which in the accompanying pictures you can see sitting atop the steering column.  The wire is long enough that the remote transmitter is actually sitting inside the car. The unit has a metal element for fast detection of changes and a 30-second refresh rate.
- Scan gauge which reads temperature directly off of the vehicle's intake air temperature sensor.
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.
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