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Discussion Starter · #1 ·
my brother in law has a 89 cherokee with a 4.0 it was building ALOT of pressure in the cooling system, it blew up the upper hose then he put new hose and a reservoir, then i got it , i put thermostat since it didnt have one, and a waterpump incase it was not spinning, and pulled the radiator and had it flow checked and it was plugged, so i replaced it, IT DIDNT change at all, looking for some info .......
 

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Discussion Starter · #4 ·
i flushed the whole system, last night i pulled the head, i think i found a crack in the cylinder wall
 
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