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Discussion Starter · #1 ·
i have a 06 sierra 5.3l a few months ago i got a crack in the radiator, truck started getting hot, shut it off to avoid any problems. had it towed to my house and replaced the old radiator with a new dual core aluminum radiator and i drained the system and refilled it. truck hasnt overheated at all running at about 200 degress in the heat around 100+ all summer. the last few days it has started leaking coolant from the overflow tank not too much but enough to leave a puddle under it but only iof the truck is turned off, if its running it doesnt leak at all. when cold i check the coolant level and its full, and when its running its full aswell and circulating. need some help soon, need to sell truck before deployment. thanks in advance, luke
 

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