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overheating after 45 minutes no heat after 30

1K views 3 replies 4 participants last post by  Singletary02 
#1 ·
I have a 2004 ram 1500 4 door it runs great heats up as normal heat and defrost work correctly for 30 min then the heat blows cool and the truck overheats. I acn go to work 12 milkes away set all day and come back home but if I go any further or run the truck 40 minutes it overheats. I have flushed the system every way I know how replaced all radiater hoses flushed the heater core from both directions and replaced the thermostat twice and then learned how to check it it is opening correctly.

I can run 30 minutes at a time for a month just can not run over that has anyone else ever had this problem Truck has 110k miles on it
 
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