Sorry I didn't mention that the low speed fan works great.

I let it idle to warm up on a warm day and the low speed fan cycles on and off, as I would expect.
It's just in traffic, the high speed comes on if I have to sit for a few minutes. 

Tom

> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Dennis Haynes
> Sent: Saturday, May 03, 2014 10:51 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: 1987 Syncro Cooling Issue
> 
> If no low speed then you need to check the switch or most likely the resistor
> behind the driver side head lights.
> 
> Dennis,
> From my phone.
> ________________________________
> From: Mister Tom<mailto:TomsGroups@SALICOS.COM>
> Sent: ‎5/‎3/‎2014 1:07 PM
> To:
> vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.CO
> M>
> Subject: 1987 Syncro Cooling Issue
> 
> The high speed radiator fan comes on before I expect it when I am stopped
> in traffic.
> 
> This can occur  well before the needle hits the LED.
> 
> The system will run with needle in the middle of the LED on warm days, so I
> think the gauge is good.
> 
> I have replaced the fan switch and it acts the same.
> 
> 
> 
> I have a bleeder valve on the radiator, with a tube into a jug of water. The
> system doesn't push air out, just coolant.
> 
> 
> 
> So I am asking if the radiator itself can go bad in some way where the fan
> switch sees hotter temps than the circulating coolant?
> 
> I didn't think the radiator would trap air any place except at the top.
> 
> And then. it doesn't happen all the time.
> 
> 
> 
> Thanks for any help.
> 
> 
> 
> Tom Salicos
> 
> '87 Syncro Westy w/EG-33