Aug 22 2008
overheating problem flushed out system and changed the thermostat
QUESTION:
1998 f150 xlt larriat 4.9 str 6, overheating problem flushed out system and changed the thermostat, It boils over in the overflow tank — no leaks — flushed out cooling system and changed thermostat and coolant ran cool for about 350 miles and then started to climb —
ANSWER:
Sounds like the radiator fan is not coming on when it should or not at all. The straight 6 engine do not produce as much heat as the V series engine as they have less side wall pressure on the pistons, so less friction = less heat. That being said, it takes longer for a straight engine to overheat.
Check to make sure the fan is coming on, if it is not check the fan itself and work backwards to the relay, switch, etc.
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