Quote:
Originally Posted by interested!
Hi! Had the same problem! found the solution by COLD pressure testing the radiator cap , found to be releasing pressure too early and continuing to zero . This can be done by making a 4 way adapter to :COLD pressurise system / check pressure / release pressure and removes bubbles , this can be put into top heater hose , please see pictures . cured by adding shim to rad cap at sealing ring to increase length . set to release at around 13 PSI ,should shut off at around 10 PSI .Check by putting the OVERFLOW PIPE into a container of water and pressurise system with a foot pump attached to the shrader valve and check for bubbles ( releasing pressure ) leave to settle and watch gauge for bubble stop ( containing pressure) .By COLD testing the cap can be removed and refitted quickly after releasing pressure .This can be left in place to generally check the system for leaks .
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Please see photo of shim position for message above. The small valve in the centre should be firm enough to contain pressure , BUT , weak enough to allow vacuum refilling of the system after shutdown - ensure all rubber seals are in good condition ( no nicks or wear grooves )