Basically "water Wetter" is a surfactant. Its magic is reducing the surface tension of the coolant so that it stays in contact with those hot surfaces that are much hotter than the bulk coolant temperature. It also reduces the micro boiling-vaporization that can cause all sorts of erosion damage. This can be especially beneficial in our sleeved cylinder engines. We don’t see much cylinder damage from cavitation erosion but it is very common on the head studs. 

As for effecting the sensors and the like the thermostat is still going to wait until the coolant gets hot enough for it to open. If anything the improved surface contact and better heat transfer may actually make the gauge reading higher when the coolant is saturated with heat. 

Most modern coolants and anything designed for heavy duty diesels has this covered. The largest benefit is for the racing crowd running straight water. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Dan N
Sent: Sunday, July 12, 2015 2:22 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Water Wetter questions...

hi all,

I plan to add a bottle or 2 of Water Wetter to my van..

according to what I know (from the web)... Water Wetter helps to better dissipate heat in the cooling system...

but... the question is...

would Water Wetter (or any similar product) affect the Temp2 sensor reading on our vanagon...

would our vanagon run richer or differently because it may run cooler?

could you please give some thoughts about using this product?

thanks

dan