Thanks Juha,

I've tried that, and both the inlet and outlet pipe of this pump gradually get colder. So it looks as if the water is flowing ok
without bubbles.

Does anyone know where this 3rd sensor is?

Robin
90 Vanagon Atlantic Westfalia TD
84 Vanagon Joker Westfalia D (for sale)

Juha Koivisto wrote:

>  As I can remember there is third sensor for this pump.  I don't have Bentley at hands now so I can't be sure.  If there is it
> might be bad..or the other alternative is.. this pump is located at highest point of engine compartment and there could be an air
> bubble and coolant doesn't circulate at all => sensor says to pump it's hot still here just keep on pumping.  Test if the one or
> both hoses of this pump are cold after drive..if yes => there is an air bubble. Check this first. Juha Koivisto88 Vanagon
> (Caravelle) 1,6TD (old school bus with 9 seats)TURKU, FINLAND

[text/x-vcard]
begin:vcard
n:Oomkes;Robin Oomkes
x-mozilla-html:FALSE
org:S.W.I.F.T. sc;Market Infrastructures Team
adr:;;;;;;
version:2.1
email;internet:robin.oomkes@swift.com
title:Analyst
fn:Robin Oomkes
end:vcard