The fan switch is new and it acted the same way with the old switch unit.

That's why I asked the question whether a radiator could fail in a such way that the fan switch was seeing non-cooled coolant, but the radiator was actually working otherwise.

Now trying to find my IR thermometer.

Thanks again,

Tom

> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of kenneth wilford (Van-Again)
> Sent: Saturday, May 03, 2014 11:43 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: 1987 Syncro Cooling Issue
> 
> If the low speed fan is coming on with the AC switch then it is most likely the
> fan switch on the lower drivers side of the radiator.  They can go wonky.
> 
> Ken
> On May 3, 2014 2:12 PM, "Mister Tom" <TomsGroups@salicos.com> wrote:
> 
> > Hi Ken, thanks for the reply.
> >
> >
> >
> > I understand that if the resistor was “open” and the low speed fan
> > didn’t come on, temperature would rise until the high speed fan switch
> tripped.
> >
> > The temperature is not rising when the high speed fan comes on.
> > Sometimes only halfway to the LED.
> >
> >
> >
> > The low speed fan DOES come on, in fact I turned the A/C switch on to
> > keep the fan on when my high speed fan was acting up.
> >
> >
> >
> > Or, do you think it is partially open and the low fan doesn’t turn
> > fast enough?
> >
> >
> >
> > Tom
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > *From:* kenwilfy@gmail.com [mailto:kenwilfy@gmail.com] *On Behalf Of
> > *kenneth wilford (Van-Again)
> > *Sent:* Saturday, May 03, 2014 10:56 AM
> > *To:* Mister Tom; Vanagon List
> > *Subject:* Re: 1987 Syncro Cooling Issue
> >
> >
> >
> > Tom, most likely the radiator fan low speed resistor is bad.  We have
> > these in stock.  It looks like a green roll of quarters and lives
> > behind the drivers side headlight assembly.  It can be easily
> > replaced.  Let me know if I can help you further,
> >
> > Ken Wilford
> > John 3:16
> > www.vanagain.com
> >
> > On May 3, 2014 1:06 PM, "Mister Tom" <TomsGroups@salicos.com> wrote:
> >
> > 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
> >