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Originally Posted by BotaBigot
Existing fan just might reverse. Worth a try with a quarter-inch ratchet. Put cardboard against radiator to protect fins. If it works, this would be elegant in its simplicity. 
I think your "cookie sheet" would totally restrict airflow and overheat.
Playing devil's advocate...if you would go to the trouble to install microprocessor coolers, why not just put in the heater core...  |
John-
I was thinking about using the cookie sheet to restrict the flow to cause things to run hotter knowing that I was going to expel the heat inside the cab with the CPU coolers. Because of my assumptions with the coolant flow rates, I am basically using the CPU coolers as heater cores. I just like the mounting flexibility that comes with the CPU coolers. What is the normal in and out sizes for an automobile heater core? 5/8 or 3/4? I figure the main radiator would still provide some cooling (given the cold outside temps) with the two CPU coolers picking up the rest of the load. The main thing was that I did not want to be sucking all of the warm air our of the cab.