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Coolant Leak Help!!!!

1K views 3 replies 3 participants last post by  Jstanzo 
#1 ·
So I just finished swapping a 2015-16 coyote motor into my 2000 GT and upon first startup with coolant I had the heat on in order to bleed the coolant system to get fluid through the lines in the heater core. There is a small leak coming from the back of the motor and I cannot seem to find it. I triple checked the heater hoses and nothing. Its a brand new crate motor so I would hope its not a freeze plug but is possible. My heater core was perfectly fine before this swap, heat worked great and there is only 51k miles on the chassis so I do not understand what this could be. Please help!!!
 
#3 ·
A borescope can be really handy for this kind of thing too. You can even find cheap $10 ones that plug into a laptop's USB port, or a smartphone.

You might also want to use a pressure-tester to pressurize the system without having to run the engine.
 
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