Success, Using the knowledge that it was likely the switch I first tried it and yes no fan at high setting.  I then exercised it several times and tried again.  Now it works.  The more I used it the more consistent. 

Thanks for the tips and it is now reliable again.

Eric Caron 

> On Apr 2, 2025, at 5:06 PM, Dennis Haynes <d23haynes57@HOTMAIL.COM> wrote:
> 
> I would start at the switch itself. Only one fuse. The switch feeds the motor directly for high speed and the other speeds go through a resistor. 
> 
> Dennis
> 
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of Eric Caron
> Sent: Wednesday, April 2, 2025 3:10 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Fan switch question
> 
> Hi folks,
> 
> A strange issue with my 85 Vanagon, the defrost and heater fan works on low and medium but cuts out on high.  
> 
>        Is there a separate fuse for this operation?  Or a place I should start to look for a fix?  Is there a common known reason for this out there?
> 
> Eric Caron