Date: Tue, 5 Sep 2017 23:06:00 -0400
Reply-To: "ddbjorkman@verizon.net" <ddbjorkman@VERIZON.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "ddbjorkman@verizon.net" <ddbjorkman@VERIZON.NET>
Subject: Re: Radiator fan switch
In-Reply-To: <CAG12aiv9-vSDsTxLjWFk32eVLb2oZGLorhpfL7Uq6frwW8S2AQ@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
The Vanagon coolant system, when working correctly, is actually quite robust. There is an A/C condenser in front of the radiator that VW took into consideration. As long as you are moving, not stuck in traffic, even at 85+F ambient temp, the low speed fan takes care of things. As long as your temp guage doesn't get beyond 3/4 and no flashing red light happens, it's working correctly and don't worry about it. To more fully answer your question, your coolant has to reach 85 C/185 F to just turn on the fan. It takes 95 C/203 F to get the fan to get to high. That's a lot of degrees.
It's amazing how much one can learn when one has to research a problem. What's that about VW making owners into mechanics for the past 30 years.
Dave B.
-----Original Message-----
From: Rick Cooper <rickdcooper@GMAIL.COM>
To: vanagon <vanagon@GERRY.VANAGON.COM>
Sent: Tue, Sep 5, 2017 10:14 pm
Subject: Re: Radiator fan switch
I've got the same or at least a similar problem with my radiator fan.
The low-speed fan kicks in as expected but the high-speed fan never kicks
in. But I know it works since I've done the jumper test at both the switch
and at the high-speed relay. I have replaced the switch.
Maybe the coolant is not getting hot enough for it to kick in -- I'm in
Victoria, BC where it never really gets super hot, but I would have thought
that going up long hills at highway speed on a hot day (~85 degrees F)
should be enough to trigger the high-speed fan.
At what temp should it kick in? I've got an infrared temp gun so I could
test that.
Thanks, Rick
On Tue, Sep 5, 2017 at 3:24 PM, Dennis Haynes <d23haynes57@hotmail.com>
wrote:
> Is the radiator getting hot? For testing the wiring there are three wires
> on the fan switch. One is power from the fuse box. That wire jumped to the
> middle will give you slow speed. The two outside wires jumped will give you
> super-fast high speed. If the fan turns on with the AC than most likely the
> fan resistor is good. It is possible you just are not getting the coolant
> hot enough to call for the fan. Infrared temp gun can help here.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of David Bjorkman
> Sent: Tuesday, September 5, 2017 1:24 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Radiator fan switch
>
> Hi all;
> Still in SC. replaced the radiator and condenser (after some body work)
> and am having trouble with the fan coming on. Turning on the A/C gets
> starts the fan, so I know it works, but it won't start when the engine gets
> hot. Fuses check out OK. How does one check the radiator fan switch. I
> know that I have to jumper something, but not sure what. I would really
> like to get this fixed and get back home.
>
> Thanks;
> Dave B.
>
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