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The next day I went for a longer drive. Immediately upon getting up to freeway speed the water temperature ran straight up to 215+ deg F and the electric fans came on. The temp dropped, the fans turned off, and the cycle repeated. Double boo! I pulled over, snipped the tiewraps, and removed the grille block. Temps returned to reasonable levels.
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So - what's the concern? If it were summer and it were 90+ degrees, the fans would do the same and cool the radiator, wouldn't they?
It's all about ambient temperature and the type of driving you do. If you are typically driving one mile at freezing temps and then shutting the car off (as is my situation daily), you will need a full radiator block just to reach operating temp slightly faster than usual. OTOH, if you are driving more than 1/2 hour at mostly highway speeds, it may tend to get a bit hot.
Consider making a radiator block that is easily removable. I recently realized that I could do this with my '89 Galant in sliding two pieces of thin formica panels in front of the radiator that stay there requiring no other effort. It takes me all of ten seconds to remove them if necessary. But, seeing that I'm always freezing my ass off in the car in winter, I don't mind it being on the hot side.
