I'm sure someone must know where this switch is located...

And what's involved in changing it?  How much time / effort / skill?

I have been having a problem with my temp gauge not holding steady in
traffic, and plan to start with changing the fan switch.

http://www.busdepot.com/details.jsp?partnumber=251959481K

Any "quick" advise is welcome!

Thanks!

Jack R.

84 Westy Wolfie, with a 2.1 motor.