OK.

This is supposed to happen,the heating chamber needs to cool down before the blower stops running.

EDIT:From wemr13: Disagrees,the blow stays on for over a half hour sometimes. I can see if it is 12 min or less.

Perhaps if you would have volunteered this critical bit of information,I could have offered you a better bit of advice.The rating system if for factually wrong information.. since you neglected to include this information,I can not see where I was wrong...

For future reference.

KBC

Does it end up actually blowing cold air for a long time or is the air still warm? If the air is cold, the fan switch could be the problem