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Chevy Forum: losing antifreeze??
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  #11  
Old 09-27-2017, 06:23 PM
gmguy gmguy is offline
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Default Re: losing antifreeze??

I must have goofed up on a post. It never showed on the thread

The missing antifreeze was located in the oil pan.

I suspected the head gasket, maybe the head is cracked. will have that answer soon enough.
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  #12  
Old 09-28-2017, 09:29 AM
zora zora is offline
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Default Re: losing antifreeze??

your best bet is a manual, Hanes or Chilton, that covers head removal in detail which would show if anything special is needed
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  #13  
Old 10-24-2017, 07:24 PM
gmguy gmguy is offline
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Default Re: losing antifreeze??

quick update.

Pulled the head and had it tested and shaved. reassembled the engine and has the same issue. Not being one to give up that easily, I pulled it again and repeated the process of new gasket, bolts and torque procedures.

Second time we filled the block with water prior to assembly. once the head was torqued we attached the radiator and pressure tested the cooling system without adding any additional water. leaving the head dry and the block wet.

The coolant began to run out of the oil drain plug again. The problem is in the block not the head or head gasket.

I am in the process of looking for a used engine.

Any suggestions on something else I may have missed would be appreciated.

Tanks for all your time
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  #14  
Old 10-26-2017, 11:26 AM
zora zora is offline
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Default Re: losing antifreeze??

sorry to hear it's the block. Did the engine ever severely overheat?
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  #15  
Old 11-02-2017, 10:05 PM
gmguy gmguy is offline
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Default Re: losing antifreeze??

the vehicle has been in the family since being purchased new. It has never overheated at all. continued to run like a champ until I pulled it this week. never threw any codes. I believe that it would have had we not kept a good eye on the fluids.

Found a wrecked car and swapped engines.

Just finished the install. Next step is to put the engine on a stand. We are going to pull it apart and try to find the leak. Can't stand not knowing after all this time and work.
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  #16  
Old 11-03-2017, 08:58 AM
zora zora is offline
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Default Re: losing antifreeze??

let us know what you find
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  #17  
Old 11-13-2017, 08:57 PM
gmguy gmguy is offline
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Default Re: losing antifreeze??

Final Report.
Finally had time to dig in.

We pulled the oil pan, lower half of the block and the crankshaft. This allowed better but still limited vision.

The leak was near the #4 cylinder. There is a casting line half way up the top half of the block. The leak was in or very near this casting mark.

I assume that a minor defect finally gave up. No significant crack could be seen. We could see the water leaking from this area but could not see exactly the location so we turned the engine upside down and kept pressure to it. sprayed with a soap solution and the air bubbles pin pointed the leak.

If I had a chance to do this over, I would have put the dye in the coolant and dropped the oil pan before doing the second head gasket. Actually this would be a good first step as the oil pan is just a caulk gasket. I would have saved a lot of time and a little money too.


Thanks for your advice. Hope someone will find this beneficial.
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