Quote:
Originally Posted by geezer#99
Could be your shroud is blocking enough air at higher speeds to make the temp climb.
Try removing it and see if that helps.
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I believe this is your answer. Electric fans work great at idle, but at speed they block air from flowing through the radiator. There is a discussion about this exact issue over on chevelles.com. You might try experimenting with removing the electric fans, bolting on a simple mechanical fan, and seeing if your truck stays cool at cruising speeds.
https://www.chevelles.com/threads/co...1160281/page-3