it started loosing coolant about 2 weeks ago,peterbilt in springfield,mo replaced the egr cooler now loosing coolant again.shop in okc is saying egr cooler isnt leaking this time,any idea on what it might be?|||could be lots of things, if its not an external leak, it could be head gasket, cylinder liners,injector sleeves etc, get to a shop and ask them to put it on a coolant pressure tester and check around for a leak, usually if its leaking then they can find it
btw egr valve is a very common source, coolant gets dripped into the exhaust very slowly.
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