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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2009 Posts: 554 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 554 | I purchased a replacement 12v motor for my economy or recirculation heater. It appears I got one designed for the fresh air heater. It will fit my heater core fine but it has a 5/16 shaft instead of the 1/4. I am hesitant to drill out the fan hole since this would leave a very thin area supporting the fan on the shaft. Has anyone done this? Anyone know if this motor would have the correct speed for the fan?
That leads to the second part of the question- the fan looks like a small version of the 4 blade engine cooling fan. It will mount on the shaft facing either direction. Reversing the polarity of the motor reverses fan direction so there are 4 possibilities for the fan. How can I determine the correct orientation? I know which way I ultimately want the air flowing but just testing the fan on the motor there is so much air blowing around I am having a mental breakdown figuring out the most efficient orientation.
Chuck | | |
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