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Heater box question?

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Post by ryneb21 Mon Aug 04, 2014 5:19 pm

Quick question..I get mixed results when searching the samba. My 78 bus has heater boxes. They come up and into the engine bay as typical heater boxes do. On my baja I have the fan shroud AND the holes in the heater boxes blocked. Should I also block the boxes on my bus? I assume the air from them is just getting up into my engine compartment. Leave em open or block them off somehow? Thanks!

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Post by type4revolution Mon Aug 04, 2014 9:23 pm

Here is how it works you can not just block air going to heater boxes you will over heat everything. There is a temperature controlled blower fan that hangs above engine and needs to be 100% functional. Those that block off shroud and leave heater boxa are misinformed. If you block up shroud you must remove heater box's and use j tubes. Hope that helps
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Post by ryneb21 Mon Aug 04, 2014 9:49 pm

Yeah I've heard diff. And since it's the 2.0 it doesn't have the fan shrouds like the old motors. If I don't have the fan what do I do? Just leave em open?

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Post by type4revolution Mon Aug 04, 2014 9:57 pm

Fix it !! you should run the fan just like the factory designed it. Or lose the heaterboxs.
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Post by ryneb21 Mon Aug 04, 2014 9:59 pm

Well I'm goin on the Cherokee camp trip this weekend how should I run for the time being haha!

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Post by type4revolution Tue Aug 05, 2014 8:19 am

Are your heaterboxs in good condition or do they need to be replaced.
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Post by ryneb21 Tue Aug 05, 2014 8:52 am

Decent enough that I can tell. No leaks. Not too bad rusty.

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Post by type4revolution Tue Aug 05, 2014 9:10 am

http://www.ratwell.com/technical/Heating.html
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Post by ryneb21 Tue Aug 05, 2014 9:23 am

Thank you! So it says the pipes coming trough engine Tim from hear exchangers dot need to be left open. But it doesn't say what to do with then. Could I just connect the two with a hose for now? Or just cap em off? No time or money to fix before the trip.

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Post by type4revolution Tue Aug 05, 2014 12:42 pm

The heatsink in the heater box is what's killing it for you. Best yo remove metal ductwork between heater box and upper engine tin so the heat doesn't get pullled back into the fan. The openings left on both tins must be cleaned and sealed best to use metal tape or formed sheet metal piece to fill hole. This is still only a doctored situation and still must be addressed . the electric blower fan and air tubes and all of your engine bay sealed is best. You also must have the performed foam seal around engine bay. You have to keep the heat out of the engine bay . remember cool clean air on top hot dirty dirty air on the bottom.
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Post by ryneb21 Tue Aug 05, 2014 1:33 pm

Gotcha! Now when i take those risers im going to call them off do I plug the hole thats left in the actual heat box where they came from? Or like you say doesnt matter hot ait down below as long as the upper side is fresh? I appreciate your help to bro!

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