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Automotive Stud · 10-05-2022, 08:49 AM

It's a 42-48 heater. As long as one hose is hooked to the head and the other goes to the lower hose as described the heater doesn't care which line goes where on it. Reversing the fan motor forces air through the defrost ducts as I'm sure you know but apparently some commenters don't.

10-05-2022, 08:49 AM	#10
Automotive Stud Senior Member Join Date: May 2010 Location: New Jersey Posts: 903	Re: Ford H2O Heater It's a 42-48 heater. As long as one hose is hooked to the head and the other goes to the lower hose as described the heater doesn't care which line goes where on it. Reversing the fan motor forces air through the defrost ducts as I'm sure you know but apparently some commenters don't.