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Discussion Starter · #1 ·
Hi all my truck has 246,000km and it over heats in stop and go but not on the hi-way. any thoughts?
 

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If it's staying at normal temp while moving down the road, that tells me air isn't moving across the cooling fins at a stop or something's going on with the water pump. The 4.7 pumps have been known to break the impeller loose from time to time. The only way to check is to pull the pump and look at it.
 

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Could just be condensation. Have a chemical test done to see if there are combustion gasses in the cooling system. If any are present, do a leakdown test to pinpoint the source of the leak.
 

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Discussion Starter · #7 ·
Could just be condensation. Have a chemical test done to see if there are combustion gasses in the cooling system. If any are present, do a leakdown test to pinpoint the source of the leak.
ya true i hope i don't have put a lot of cash in it right now.
 

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Discussion Starter · #11 ·
so its a cracked block! i am getting another engine put in. What else should i get done on the engine going in it has 130,000.km on it?
 
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