Posted by Jimps on January 24, 2010 at 11:29:27 from (216.166.220.98):
I have a 1949 Super A with a thermosyphon system. I replaced the water temperature sensor on it last summer, and recently had the radiator serviced (neck was leaking). I noticed last summer and even recently that my new temperature gauge does not move. Stays below cool, even when plowing a small 1/2 acre field. I pulled the cap and ran it at half throttle for 30 minutes after I refilled the radiator. The coolant level would rise up to the overflow and dropped probably 2 or 3 cups of fluid. The fluid level seemed to level out somewhat since it stopped overflowing and would just rise up to the edge of the overflow and then "burp" bubbles and drop back down.
I think I may have a blockage somewhere in the block. Otherwise the coolant should circulate so the hot fluid would hit the sensor. Also, after running for 30 minutes, I put my finger on the lower inlet cast iron and it was cool. How can I test the thermosyphon system and what's the best way to flush it out?
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