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| Joined: | 02-21-2008 |
| Location: | Tempe, Arizona USA |
| Posts: | 48 |
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The way that the heater box is configured those two main vents will never be as warm as the air flow through the bottom of the unit or up through the vents in the dash. It's a bit of a goofy configuration and has a bit to do with how the flaps are set and how good the seals in the unit are.
I recently restored my heater box unit, there's an article here about it:
http://www.theymightberacing.com/Projects/FrameOff/JH74G/HeaterAssemblyRestoration.aspx