So I had a look at coolant pressure testers and they are how much??!!?
![Shocked :o](http://www.slroc.co.uk/forum/Smileys/default/shocked.gif)
Plan B therefore. Make my own.
So I bought some stuff from ebay. A new expansion tank cap, a standard alloy wheel valve and a selection of thicknesses of sheet rubber:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00832-20130425-1801_zps51c6e43d.jpg)
alloy wheel valve:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00833-20130425-1802_zps20596cb2.jpg)
Drilled a hole through the rivet in the cap and enlarged to fit the alloy valve:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00834-20130425-1935_zps9e833efa.jpg)
Made a gasket out of the sheet rubber:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00835-20130425-1953_zpsbe60a26d.jpg)
Fitted it:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00836-20130425-1953_zpsa25b61c4.jpg)
And assembled the valve into the cap:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00837-20130425-1955_zpsc50583cc.jpg)
Blanked off the overflow with the circle cut out of the gasket and a jubilee:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00840-20130425-2013_zpsd591acf2.jpg)
And fitted the cap:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00838-20130425-1958_zps6e5a3ab2.jpg)
Trusty foot pump used to get 1 bar (15psi) of pressure:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00839-20130425-2001_zpsf942e7b3.jpg)
Two leaks found from radiator top hose:
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00843-20130425-2028_zps6beaac89.jpg)
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00844-20130425-2029_zpsd3741d8a.jpg)
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00847-20130425-2031_zpsee78562b.jpg)
![](http://i1223.photobucket.com/albums/dd518/japstick-/Coolant%20Tester/IMG00849-20130425-2036_zps580d5500.jpg)
All in this cost less than a tenner
![Wink ;)](http://www.slroc.co.uk/forum/Smileys/default/wink.gif)