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2007 6.7 blowing heater cores

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On the 4th heater core.  Local shop in mtn home is doing the work. Everything checks out. Im guessing cracked head or head gasket but only under certain conditions does it build pressure.


Truck has a egr delete and 346k on it. Were at a loss cores are lasting 3-6 months.

I think im going to bypass the core put a valve in it crack it ooen in winter maybe crack it in summer to keep something else from blowing.


Im just thinking out load as coolant drips on my feet

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As long as anything is hooked up to the coolant system the pressure will be the same on both hoses so no matter what you do to "just crack" a valve open its going to be the same pressure as the rest of the cooling system. Still comes down to finding the reason why the coolant pressure is so high and blowing the heater cores. If it is a cracked heat it will get worse at some point most likely summer time when you working the truck harder and hotter weather.

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