I noticed when i warmed up my car today for like 15min the temp gauge went up to the middle mark like normal and anytime i warm it up goes up to normal always but once i started driving for a few minutes it started dropping and the more i drove it went down to about 160f-165f but it wouldn't go more down then that and i noticed this only happens when the weather outside is under 35f like today it was -20f windchill. Now when temps are 40f and up the temp gauge stays in the right spot what could it be?
coolant is full
1999 oldsmobile lss
coolant is full
1999 oldsmobile lss