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Not sure if this helps or not but....
The Eberspacher gas heater I run in my '59 VW will do something similar if I don't have it adjusted properly.
During the shut-down cycle the heater continues to run the fan until the internals have cooled sufficiently. There's a big rocker switch with a quartz rod in there that will either turn the fan off or run it at low or high-speeds. There an adjustment screw that if tightened too much will always run the fan and never allow it to shut down
Now granted this is 50+ year old technology but it may apply to you as well.
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Garrett Fell
2014 Honda Pilot - The *new* wife mobile
2005 BMW X5 - 4.4i - It's mine now!
2003 Honda CRV - My train car
1959 VW Beetle - My toy (13.18 @ 100.86 in the 1/4)
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