You shouldn't have to jumper the switch.
Well, yes, I guess so if you're filling with 12oz cans.

I use a 30lb cylinder.  Just fill until the pressure builds high enough to
activate the clutch.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Jim Felder
Sent: Monday, July 28, 2014 7:54 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: 1985 Vanagon A/C question

You can jumper the wires to the clutch with 12v to force it to spin and
take the charge.

Jim

On Mon, Jul 28, 2014 at 6:50 PM, Project Pat <psdooley@verizon.net> wrote:

> Differential pressure.
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Raymond Markett
> Sent: Monday, July 28, 2014 7:35 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Re: 1985 Vanagon A/C question
>
> Thanks, how do I get refrigerant in to an empty compressor if it won't
> spin?
>