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Old 02-17-2018, 10:41 PM
ben marsico ben marsico is offline
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01 D2 boiling coolant after 10ish miles and coming out of overflow tube. Temp Guage goes up when this happens. Did a pressure test with auozone rent a tool and held steady at 15psi for 20 min. Curious if anyone has seen a cracked block, heads, sleeves etc and still had the truck show good on a pressure test? I ask because misfire in cylinder 3, and loooots of white exhaust smoke made me assume cracked block or slipped sleeve initially. Now I think something is clogged stuck etc. given the ok pressure test.
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Old 02-18-2018, 06:27 AM
JohnnoK JohnnoK is offline
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Start with your thermostat, it could be stuck.
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Old 02-18-2018, 08:32 AM
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Try replacing your expansion tank cap.
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Old 02-18-2018, 11:48 AM
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Most likely head gasket failed.

I have seen bad head gaskets stil hold pressure in the cooling system.

Pressure test and let it sit for several hours.
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Old 02-18-2018, 11:49 AM
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White smoke from exhaust
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Old 02-18-2018, 09:49 PM
ben marsico ben marsico is offline
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Thanks guys I’ll let y’all know what I find out. I did also notice an unusual amount of oil in the throttle body via the crank pressure breather tube.....
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Old 02-19-2018, 10:49 AM
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get one of those kits and check for the presence of exhaust gasses in the coolant system. A pretty difinitive test for leaking head gasket if thre is not external leak.
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Old 02-24-2018, 07:52 PM
ben marsico ben marsico is offline
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Definitely exhaust in the coolant. Still baffled that it held pressure.
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Old 02-25-2018, 11:47 AM
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If the exhaust gases are getting into the cooling system from cylinder 3 you have a cracked block or (unlikely) a cracked cylinder head.
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