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Hi. Thanks for using JA! I will try and help you out.
Your leak is coming from one of the outer O rings on the Oil cooler. I have seen this before. The coolant runs from the front to the rear of the cooler and then goes into the side of the block. The only place coolant can leak is at either the front or rear of the oil cooler. All you will need to do re replace the O rings on each end.
Please let me know if you need more help or have more questions.
I see. Thanks for the information.
If the O rings are clean and dry, the next thing I would suspect is Jacket water cooler or coolant diverter valve.
If you have a picture, that would be great. I would be happy to take a look at the leak.
I'm Sorry. I do not get to see the customers side of this website. I figured you had one since I have one on mine.
No problem though. I think the coolant must be coming from the Coolant Diverter valve gasket or the Jacket Water Cooler that is beside of it. Other than the thermostat housing, those are the only items on that side of the engine that contain coolant.