I have Spal VA08-AP13-53S 1800 CFM at 13 volts. It is a pusher. I purchase a Spal relay temp control fed by a #10 wire and a 20 AMP fuse. It is hard wired not switched. There is an adjustment knob to regulate the temp it turns on. However; when climbing a long steep hill at 70 MPH on a hot day the temp climbs to the boiling point and higher. I must slow down to about 50MPH if I am going to keep going. This happens to the +8 Bitsa very rarely but it does happen. I sometime think that this fans acts as a blocker at 70 MPH.
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Seattle
