Originally Posted by jcwhitty
Hi smlranger.....you stated earlier that you can hear the motors surge, and I would agree. What do you think is the cause of the surge? Seems to me that they should run smooth unless the power being fed to them is changing.
Not sure, maybe just the quality of the motors. When I got a brand new fan motor from Heater Craft, I connected it to a good 12V power source on my work bench (one of those 12VDC converters from Radio Shack). Even the new motor surged and was noisy. When I attached the squirrel cage to the motor shaft, the motor noise increased. As previously noted, there was a lot of back and forth play in the motor shaft. I sent the motor back to Heater Craft for a refund.
We spent a long weekend in pretty cold weather over TG holiday in the coach. The three exchangers with the Aqua Hot cozy fans were nearly silent. You could hear them running if all was quiet in the coach (no TV, etc.). However, at night we did not hear the fans at all when sleeping and the coach was heated nicely. I am really happy with the upgrade.