No drain plug. Most of us begin draining the trans by loosening the dipstick tube. 
Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Don Hanson
Sent: Saturday, June 27, 2015 1:18 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Auto tranny cooling

  Is there a drain plug?   Don't know about auto transmissions in Vanagons.
  I've mounted the sender in the drain plug of transmissions in the past...You can then simply remove the wire before you drain the tranny and...you get right into the fluid.  No risk drill shavings in the tranny when you drill and tap the drain plug to take the temp. sender.

   You may scare yourself when you see the real temps down there....

On Fri, Jun 26, 2015 at 7:18 PM, Larry Alofs <lalofs@gmail.com> wrote:

> The cooler is mounted directly on the transmission.  There is no line 
> between them.
>
> I believe that some volks have mounted a temp sensor on the bottom of 
> the transmission pan.
>
> Larry A.
>
>
> On Fri, Jun 26, 2015 at 5:23 PM, Todd Last <rubatoguy@comcast.net> wrote:
>
> > I'd just put a t-fitting with the temp sender in the line to the 
> > transmission cooler.
> >
> > Tod
> >
> > ----- Original Message -----
> >
> > From: "John Rodgers" <jrodgers113@GMAIL.COM>
> > To: vanagon@GERRY.VANAGON.COM
> > Sent: Friday, June 26, 2015 1:53:21 PM
> > Subject: Auto tranny cooling
> >
> > I would like to install a temp guage to monitor the tranny oil temp 
> > but don't know how to approach this.  Has anyone done this ? Can you 
> > describe it or provide a link?
> >
> > Thanks,
> >
> > John
> >
>