Hi all,
I have a question about my 61 c10. When I shut off my truck with the heater on high, it keeps running for a while (10-20 sec.) before stopping. With the heater off, works fine. Even at medium or low it keeps running just for shorter period. All other electrical is fine.

Where should I start?

Thanks

1961 Chevy Apache

"Never turn a knob to the left"