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dailydragger03 · 01-11-2007, 02:10 AM

I don't think it is a heater core. The experience I have had with a leaky heater core is that the smell will pretty much run you out of the cab. I am almost convinced it is an expansion plug. I'm gonna try some radiator dye this weekend and see what I get. I spoke to a couple mechanics who both said the 5.3 has had some expansion plug issues on the front of the block.

01-11-2007, 02:10 AM	#3
dailydragger03 Registered User Join Date: Jan 2007 Location: Sevierville/Cookeville TN Posts: 138	Re: Mysterious antifreeze leak? I don't think it is a heater core. The experience I have had with a leaky heater core is that the smell will pretty much run you out of the cab. I am almost convinced it is an expansion plug. I'm gonna try some radiator dye this weekend and see what I get. I spoke to a couple mechanics who both said the 5.3 has had some expansion plug issues on the front of the block.