Date: Tue, 10 Aug 2010 14:04:31 -0400
Reply-To: Ed <email99@BELLSOUTH.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Ed <email99@BELLSOUTH.NET>
Subject: Re: Replacing pressure A/C Pressure switch w/o losing Freon
BE VERY CAREFULL!
This is a really hazardous thing to do if you do not know for sure there is
a Schrader valve behind the switch. You might not know if there is a valve
there or not until just before the switch is blown off.
There will be about 270 liters of oily freon gas blowing out in your face at
about 100 psi if there is not a valve behind the switch.
This can make a real greasy mess in the interior of your van, not to mention
inflict serious damage, including blindness, to your eyes and lungs.
This is a whole lot more hazardous than simple refrigerant hose repair and
recharging because you don't know for sure what you are working with. IIRC,
the switch will be very close to eye level and maybe pointed toward your
face when it is unscrewed. To just "unscrew it and screw the new one back
in" without 1) knowing there is a valve, and 2) the valve being in good
working order is a recipe for disaster. The valve, if there is one, is
really cheaply made and will not have been operated for probably 20 years
and may be stuck, have dirt under it, or simply leak because of age.
Your best bet would be have a professional do this for you. If there is a
valve, it will take him about 10 minutes. If there is not a valve, you will
have to get it recharged anyway. At least, this way you will be able to see
when you come back home.
This is a really scary thing to do under any conditions. Don't take
unnecessary chances.
Ed
On Tue, 10 Aug 2010 12:13:03 -0500, Michael Sullivan
<sandwichhead@GMAIL.COM> wrote:
>Sweet!. It looked like it would have a cut off, but I wasn't sure. This
>trinary switch is on the high pressure line, so just inscrew it and screw
>the new one back in, right? Thanks, Mark
>Michael in San Antonio
>91GL Weekender AT 2.1L 'Gringo'
>
>
>
>On Tue, Aug 10, 2010 at 12:10 PM, <mdrillock@cox.net> wrote:
>
>> Yes, you can change the switch on your late model without losing the freon.
>> The models with a trinary switch such as yours have a valve behind the
>> switch that closes when the switch is removed.
>>
>> Mark
>>
>>
>>
>> Michael Sullivan wrote:
>> > Can I take the pressure switch off the high pressure line in the DS side
>> > rear D pillar and pop the new one in and NOT lose all the freon? Thanks.
>> > Michael in San Antonio
>> > 91GL Weekender AT 2.1L 'Gringo'
>> >
>>
>>
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