Quote:
Originally Posted by Zeke's Garage
I'm intrigued by this...is there a reason for it? I've never really paid much attention to which side of the core went to which outlet/inlet on the engine/radiator.
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The theory is that the heater core fills from the bottom and in doing so purges all the air out of the heating core allowing it to heat to full potential.
I have also found a number of trucks including mine that are the exact opposet, the reason i say this is that the heater core has 2 different hose sizes, a 5/8's and a 3/4. Per everything i have read the 3/4 is the return and the 5/8's is the inlet. On my truck i have a 3/4 return port on the bottom of the core, and my truck has a radiator return which is also 3/4. I have looked at a bunch of photo's and have found this frequently. My truck does heat up so i don't know if it really matters.