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Lm7 loosing coolant without any leaks

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Old June 10th, 2018, 1:27 AM
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Default Lm7 loosing coolant without any leaks

I was driving the truck for about an hour topped off the coolant yesterday haven't driven it except for that hour. The temp gauge was jumping up and down but not much at all. Got home to check the coolant and it was all gone and I opened the coolant overflow cap and the tank overflowed and started spitting out a ton of coolant. Anyone have any ideas what it could be?
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Old June 10th, 2018, 12:54 PM
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is it coming out of the exhaust. Could be your head gasket.
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Old June 10th, 2018, 7:54 PM
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Are you sure you didn't have an air bubble trapped?


I like to open the system while it's cool before the thermostat opens, top it off and idle it until it opens the thermostat, add coolant as needed. I tend to let it run long, just to make sure it circulates as much as possible.
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Old June 12th, 2018, 9:10 PM
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Default How to bleed the cooling system

change the radiator couple days ago losing coolant after maybe about 30 minutes or so boiling pullover put more water in temperature goes down to around 210 can only drive short distance can somebody please advise
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Old June 13th, 2018, 9:09 AM
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Originally Posted by bear69 View Post
change the radiator couple days ago losing coolant after maybe about 30 minutes or so boiling pullover put more water in temperature goes down to around 210 can only drive short distance can somebody please advise

maybe an air lock, or faulty themostat
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