My k series has developed a high water temp reading. When the engine warms up top hose gets warm then at around 80-90 the thermostate opens bottom hose warms up, all hoses get hot and about 90-100 fan comes on and cools engine down. all good stuff., but this is in the garage! Out on the rd the temp gauge gets into the red ! fitted new thermostat same problem. cant see any leaks and no water in oil or using water. could my temp sender be at fault? i`m open to suggestions.