I have owned 6 new Silverado's 4 --- 6 & 8 cylinder and they will not get up to temperature within 3 miles from home in the cold weather where i do all my driving. If i shut the heater fan off and dial the temperature control knob to cold, it will reach operating temp of 207 but when i turn the heater on and put the fan up to high you can watch the temp gauge go down to 180 this is all city driving below 30 mph
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