I have had a small coolant leak going on?

2007 CHEVROLET 2500
341,000 MILES • 6.6L • V8 • 4WD • AUTOMATIC
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JKRO1098
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I've had a small coolant leak going on, now it seems to be getting worse. I've noticed that when I use the heater it seems to leak faster, and I wouldn't have heat. I'm thinking it's the line in or out of the heater core, but I'm not sure because I can't see anything. I am seeing coolant pool and drip from the oil filter housing which I have a picture of. Any ideas or diagrams that would help?
Jan 16, 2023 at 6:00 AM
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STRAILER
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I didn't see the picture did you upload it? We should pressure test the system and then get under the tuck with a flashlight, and then look around on top of the engine and hoses.

here are two guides to help:

https://www.2carpros.com/articles/radiator-pressure-test

and

https://www.2carpros.com/articles/car-is-leaking-coolant

Please get back to me so I can help you fix it.
Jan 16, 2023 at 4:11 PM
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JKRO1098
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I found the leak! I ordered the pressure tester and sure enough, one of the heater core hoses. The one behind in the picture. Thanks guys!
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Jan 23, 2023 at 8:34 AM
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STRAILER
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Thanks for the image. Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
Jan 23, 2023 at 12:19 PM
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JKRO1098
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Hi, so I came back to this thread because I have a coolant leak again. I've pressure tested the coolant system and the leak is coming from the back of engine on the driver's side. I've been told it's a cracked freeze plug, would you have a diagram that shows where the freeze plug is for my engine?
Nov 4, 2023 at 4:25 PM
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STRAILER
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I would use a small mirror on a stick and check the back of the intake manifold as well. It does not show us that information, but I do believe you have freeze plugs at the rear of the engine.
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Nov 5, 2023 at 11:34 AM