did you mean *not* properly pressurized?

On Sun, Sep 13, 2015 at 1:20 AM, Dennis Haynes <d23haynes57@hotmail.com>
wrote:

> Bubbling and gurgling in the cooling system is a sign that the system is
> properly pressurized and parts of the engine are hot enough that the
> coolant is flash vaporizing. This is a great way to cause parts to warp and
> other nasty stuff to happen. Begin with testing the pressure cap and making
> sure the system is fully filled-bled. If this continues you need to look
> for the cause of either lack of pressure or if the system continues getting
> air in it you need to find the source. This is often the early signs of
> head gasket failure or cracked heads.
>
> Dennis
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of Don Hanson
> Sent: Saturday, September 12, 2015 2:58 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Thermostats...question(s)
>
>    Is there an accepted method to test the function of one of our double
> style thermostats?   I am skeptical about the proper operation of my
> currently installed one.... lately....I have had some other issues with
> cooling and recently replaced my oil/coolant heat exchanger (mine had a pin
> hole water leak to the outside).   But I also noticed once recently that I
> could hear some bubbling in my coolant system when I shut the van off,
> and I have not heard the fan recently.
>
>    Anyhow, I have a spare used thermostat sitting on my bench, unknown
> condition....I'd like to see if it actually works and maybe swap that
> in....If no worky, what kind or brand should I buy to get a good dependable
> part?
>
>    So can I drop the spare I want to test into boiling water and measure
> it, testing for function, or some such?   It would be good to know, even if
> I do just buy a replacement, that my spare is OK and working..
>    I have calipers  to measure mechanical things.
>