also earlier when i was flushing the coolant system out i had to bring it up to temp for 10 mins with the heater on hot so took a video clip of the engine running it was puring away real nice i was keeping an eye on it closely while it had the flush in the engine ( added a new hose clip to the breather on side of the engine after the video when i drained it all out and flushed through clean water ) so thought i would share the clip if you hear a hum noise its the heater running lol and i was watching the video just a min ago it sounds lumpy but when your in the moment its a lot quieter as the clip shows when i stand back a little
regards
Robert