I've never had this issue and I've had a 160 tstat for 2-3 years now. I've driven in the snow and in teens/single digits temps with a vented hood. Did you fill from the top hose?
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2010 2SS/RS
Z/28 intake, NW, FAST 102, speed engineering LT's, some exhaust, ATI -10% pulley, GM flex fuel injectors, DSX flex fuel sensor, MGW shifter, HP Tuners, some suspension work, stickers and a little weight loss. 12.63 @113.53
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