The fan on my Focus starts at 233F and shuts off at 222F. In summer FWT will regularly run over 200F...maybe from ~204F up to 210F? FWT is one of the readings I use all the time.
I'll probably go ahead and cover 2/3s of the rad...I do have the LED indicator mounted right on top of the SG. It's when I see running temps above 200F that I see the good mpg.
I might come up with a grill cover that is easily mountable and that has a sliding panel in it for adjustment....something with clips on it to be easily removed.
It's the "scary high" that you need to worry about...theory being that this weakens the headgasket over time due to too much movement....
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