By-passing Heater Matrix

[mark_airey]

Ray this is your answer

Nah, the heater matrix causes a restriction on the pipes, on the water distribution thing on the back of the block, there's nothing to stop it all going through the heater matrix pipes, if you allow those to be free flowing (i.e. bypass the matrix) it'll all flow from from the head straight down to the water distro block and straight through the engine again, with nothing forcing it through the radiator if the thermostat is open.

Hence why you've got to block it off, rather than bypass.

Hence my above question and the other posts in this thread Matt