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Unread 05-04-2013, 09:22 PM   #1
jarcher401
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Blazer Blower Motor. What heater core

So I plan to rebuild my heater box with the blazer motor. I was told there is a 3 speed and a 2 speed heater core. What is the difference, and what should I put back in?

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Unread 05-05-2013, 04:56 AM   #2
keith460
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Heater Core doesn't have any speeds, it's just a small radiator that emits heat. The fan blows across the Heating Core to provide the heat you feel in the cab.

The Blower Fan is 3 speed provided you have the 3 speed fan switch and resistor pack installed.
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Unread 05-05-2013, 06:48 AM   #3
yahwhy
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There are some different heater cores, aluminum or copper, and some have the tubes going into the core squared, where they are brazed to the core, this makes them stronger and less prone to the brazing/weld breaking when installing/removing the heater hoses.
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Unread 05-05-2013, 09:52 PM   #4
jarcher401
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I read that with the higher flow of a 3 speed motor I would need a thicker core to slow the moving air down enough so heat exchange could take place
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Unread 05-05-2013, 09:58 PM   #5
frhrwa
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Quote:
Originally Posted by jarcher401 View Post
I read that with the higher flow of a 3 speed motor I would need a thicker core to slow the moving air down enough so heat exchange could take place
where did you read this? like said above, square tube vs round tube, and a heater core made of copper of course is the better (made in AMERICA).. you want to stay away from that CHINESE CRAP.. Blower motor the same, stay away from that CHINESE CRAP.. buy AMERICAN or CANADIAN..
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Unread 05-05-2013, 09:59 PM   #6
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Quote:
Originally Posted by jarcher401
I read that with the higher flow of a 3 speed motor I would need a thicker core to slow the moving air down enough so heat exchange could take place
Sounds like hooey to me. I used my original core and the heater cooks......it almost exchanges heat too well!
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Unread 05-05-2013, 10:11 PM   #7
frhrwa
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I was going to say the same thing, just wanted to see where he read that baloney.. my stock core puts out 3 times the heat that it used to.. and the defrost doesn't let any ice or snow stay on the windshield.. works like it should have 45 years ago when I was freezing my a$$ off in the mtns of Colorado and California.. and, having to stop and scrape ice and snow off the windshield so I could see..
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