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79 620 coolant leak


dirtylilhustler

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While i was on the highway i noticed my engine temp was almost on "H". I dont know how long i was driving with a hot engine. But when i stopped, it was boing over.

 

Anyways, when i drove it home the next dayi made sure it didnt get much hotter than 2/3 the way towards "H". I flushed the system (it was full so there were no leaks), put a gallon of 50/50 and i noticed theres a leak.

 

Im having a hard time finding where the leak might be coming from. It doesnt leak a lot when sitting in the driveway, but if i start it up it begins to drip down off the back of the block where it meets the trans and also i see it dripping off the bottom of the oil pan.

 

Did i fry my engine? I dont believe the leak is internal because for one i can see it leaking and two theres no coolant in my oil. Where might this leak be coming from? And how would i go about fixing it?

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While i was on the highway i noticed my engine temp was almost on "H". I dont know how long i was driving with a hot engine. But when i stopped, it was boing over.

 

Anyways, when i drove it home the next dayi made sure it didnt get much hotter than 2/3 the way towards "H". I flushed the system (it was full so there were no leaks), put a gallon of 50/50 and i noticed theres a leak.

 

Im having a hard time finding where the leak might be coming from. It doesnt leak a lot when sitting in the driveway, but if i start it up it begins to drip down off the back of the block where it meets the trans and also i see it dripping off the bottom of the oil pan.

 

Did i fry my engine? I dont believe the leak is internal because for one i can see it leaking and two theres no coolant in my oil. Where might this leak be coming from? And how would i go about fixing it?

 

 

It over heated but was full?

 

While the core plugs can corrode and seep coolant it is very uncommon. Much more likely is a blown head gasket. Check along the joint between the head and the top of the block. The engine is lower to the rear and coolant can easily run back along the crease and drop down the back to the top of the transmission.

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Gushing? Would indicate the cooling system would be empty in a couple of minutes. The leak would be major.

Dripping? Even a fast drip drip drip would take much longer.

Wetness with a hanging drip even longer and a smaller leak.

 

 

Well go with the evidence. You say there was a leak you may not have fixed on the thermostat housing. Water will run down hill. When driving, fan air may blow it to the rear along the block behind the exhaust manifold. Start looking around the thermostat housing.   

 

Keep in mind that over heating an aluminum head can warp it and allow the head gasket to 'blow'.

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I havent had time to fix it yet this weekend. But im assuming its the thermostat housing because it leaks before it gets warmes up enough for the thermostat to open up the cooling system through the engine. They gave me the wrong gasket (2 holes) but i decided to use it anyway. Ill have to order the 3 hole gasket and if that doesnt fix the problem i can assume its either the intake or head gaskets.

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