Jin
From distant memory water should always flow through the matrix in one out the other. Depending on the flap angle cold/hot releases the heat to the car boosted by the fan.

water will follow the easiest path so you are probably correct with your stat theory as the 'stagnant water' in the matrix will go cold especially when the fan is run.

 this may help but is for zetec.

http://www.emeng.gentlyhosting.co.uk/Cooling/Part1.htm

Gary

On 18/11/2012 09:45, jin wrote:
having trouble finding the answer to this, and ive asked in 4 places
so far

could you guys take a look at your Y pieces in the heater matrix
circuit and tell me which way they go please?

in my wisdom when i replaced the matrix last year i used a T piece as
it looked better and the pipes fell in the right position, but i only
get warmth through the matrix when the stat is closed (presumable
because there is more pressure) but when the engine warms up it all
go's cold inside, presumable because I've put the T piece with the
straight edge going across the manifold and the single leg going to
the union into the manifold, i guess that the Y piece single leg goes
to the manifold and the 2 closer legs go to the 16mm heater hosed?

any info much appreciated, a picture even more so.


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