Replace the blower motor relay, it is defective and sticking internally, causing the heater motor to keep running.
If it was the relay why does it function normally whe car is running but comes on again on high speed 30 seconds after shutting car off
Because a relay (it is a switch) when defective will do some unusual things and is the easiest thing to swap out in the PDC. If the relay is known to NOT be the cause, then a more detailed approach will be needed to isolate this unusual circuit issue, and will require a volt meter to test voltages with the vehicle on and off as well as other circuits. Making this happen in full detail on the posting is not an easy task.
I know This post was 8 years ago but I'm curious to see if you ever found where that really was is I need to find it in my truck?
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