Block Heater noise (Buzzing sound)

[5B Steve]

  I just noticed this noise, it's never done this. The sound is coming from the left thermostat. Unpluged it and the

   sound stopped. What's going on here?

   Steve 5B.......

[wg4t50]

Normal sound for a water jacket heater, sounds like coffee perking.
Being in the emergency generator business, we have many/hundreds of units with the block heater and every so often we get a call reporting a strange noise comng from the generator described as a coffee pot sound, you just have to laugh some times.
Dave M

[gus]

Both my bus and Cummins Dodge PU heaters do this, normal.

[Ed Hackenbruch]

That is how i make sure mine is working. Plug it in and then go listen for it to come on.

[5B Steve]

  Dave, Gus, Ed, thanks for that info.


  Steve 5B.....

[luvrbus]

They really don't buzz till they get a little build up on the elements I have noticed that when I install the new ones 

[georgemci102a2]

 Can we leave the block heater plugged in for an extended period of time,like a month?  thx George

[luvrbus]

I wouldn't recommend it on the PC board a guy had his Prevost catch fire from a block heater

[georgemci102a2]

Mine is a straight plug in to the block,is that ok? thx George

[Lin]

George, If you are saying that the block heater has a cord that you just plug into a socket, that is pretty standard.  I have a portable timer that I use with it since I am likely to forget to unplug it.