The same main A/C relay contact used for the middle speed pressure
switch and middle speed relay control also provides the direct power for
the radiator fan on low speed through the resistor when A/C is on.

Bentley page 97.144 current track 21 which feeds to track 36 on 97.145
which connects to radiator low speed resistor pin 2, same as the rad
temp switch low speed does.

Mark

Dennis Haynes wrote:
> That relay is just for the super high fan speed. Controlled by the 2nd stage contact on the radiator switch. It even gets its own feed from the battery. For the AC when the compressor is on a relay connects to the low speed circuit with the fan resistor. At high head pressure the pressure switch operates a relay in the fuse box adding the 2nd circuit of that fan resistor. That also stays active even after shutting off the AC or ignition. Note the radiator fan switch actually feeds the motor during the cooling first stage. Why this switch fails so often.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List <vanagon@gerry.vanagon.com> On Behalf Of Jim. Felder
> Sent: Sunday, September 6, 2020 11:35 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: Radiator fan
>
>
>
>
>  Also on the 2.1 isn’t there a circuit with a relay in the driver side D pillar that can do the same thing, or is that just the high speed fan setting?
>
>
>
> Jim
>
>
>
>
>
>
>
>>
>> On Sep 6, 2020 at 8:49 AM,  <David Beierl (mailto:dbeierl@gmail.com)>  wrote:
>>
>>
>>
>>  Radiator thermoswitch is the only likely candidate.
>>
>> Yrs,
>> d
>>
>> On Sun, Sep 6, 2020 at 9:42 AM Robert Clemmer  <n51219@comcast.net>  wrote:
>>
>>>  91Tintop GL 2.1 automatic. All original.
>>>
>>>
>>>
>>>  Well, my car finally gave me something to do. When returning from
>>> running  errands yesterday the low speed fan would not shut off. I
>>> resorted to  disconnecting the battery to shut it off and save the
>>> battery from deep  discharge.
>>>
>>>
>>>
>>>  Anyone want to weigh in on the most like culprit. My guess is the
>>> temperature switch on the radiator.
>>>
>>>
>>>
>>>  Thanks in advance
>>>
>>>  Bob Clemmer
>>>
>>