Coolant leak

[CheapThrills]

My buddy said one night he was out by his truck, and noticed a huge pool of coolant. He shut off the truck, and let it sit over night. Went back to it in the morning, refilled it, and ran it for a good half hour, no leak. Could it possibly be the thermostat? If not, what else?

Thank you.

 

[Vanner1993]

Could be the water pump gasket too, similar to what happened to my dad.

 

[CheapThrills]

Could be the water pump gasket too, similar to what happened to my dad.

alright, i'll throw that by him. thank you.

 

[Vanner1993]

leaked out overnight and drove 3+ hours home on the highway without a leak.

 

[gi728]

Is it a slow drip or a good stream? Might be the rubber "freeze" expansion plug behind the flywheel. Mine was doing the same thing never found the leak until I had a river run out from the "tranny". But there is a rubber plug back there that will deteriorate. And well fall out. Fyi.