Strange overheating

revdrbarry

Registered
Mark VIII 94 4.6 -- after starting and operating for about ten minutes, engine temp climbs to the red. It stays there for 3-4 minutes, then goes back to normal temp and runs out ok after that. I replaced the thermostat, and it ran ok for several days, but it is doing it again now. Any ideas? Thanks
 
Do NOT fill it via the overflow tank! When cold, remove the crossover tube fill cover. Fill until overflow bottle gets to desired level. Run car until gage is at mid-range (or wherever your normal is). Let cool, repeat. Run car as usual and recheck often - I've had to keep doing this few a few times before it finally burped all the air out.
 
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