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Zetec coolant layout
alistairolsen - 15/8/10 at 12:34 PM

DOes anyone have a labelled diagram of the zetec coolant passages?

There is one large outlet at the cambelt end of the block which I think is the bottom rad hose and one end of the heater matrix?

On the thermostat housing there are two outlets pairs, one large, one tiny which look to be rad overflow and top rad hose?

Then there are two ~15mm bore outlets which should be the other end of the heater matrix and the header tank?

Cheers

big_wasa - 15/8/10 at 12:52 PM

Bottom hose at the water pump does indeed go to the bottom of the rad.

Thermo stat has four outlets.

32mm goes to the top of the rad. 15mm below that is the warm up bypass and is Teed into the bottom hose near the water pump. 15mm on the other side of the stat goes to the heater. The outlet is again Teed to the bottom hose.

header tank is again Teed to the bottom hose.

The stat housing alos has a small bleed hose that goes to the top of the header tank. You can also do the same with the rad if it has one.

[Edited on 15/8/10 by big_wasa]

coozer - 15/8/10 at 01:31 PM

This any good?

Engine Plumbing
Engine Plumbing

The 15mm outlet under the main one is the bypass/heater outlet, the one on the back is the heater return, so blank it if not using it (7 or Jago?)

[Edited on 15/8/10 by coozer]

austin man - 15/8/10 at 01:42 PM

I have mine plumbed like the above however when the engine is reved the coolant is forced back into the header tank and it overflows. Any ideas.

The only ting I am doing differently is filling the system via the stat housing on the 20mm pipe

coozer - 15/8/10 at 02:22 PM

quote:
Originally posted by austin man
I have mine plumbed like the above however when the engine is reved the coolant is forced back into the header tank and it overflows. Any ideas.

The only ting I am doing differently is filling the system via the stat housing on the 20mm pipe


I had that problem and it was down to the bypass and header using a common connection to the bottom hose. They are now totally separate and its OK.

Hows yours plumbed? Is the header a pressure tank? I'm now back to a Corsa tank after ditching the fancy alloy one.

I started with a Raceline water rail and am now back to a system that looks exactly the same as Ford intended.

austin man - 15/8/10 at 02:29 PM

using a mondeo header tank, the outlet of which is going to the stat housing on the inlet side 20mm pipe or thereabouts. the bypas hose is coming from the stat and t's into the pipe that attached to the pump (using standard mondeo pipe ) this also goes to the bottom of the rad. I have fitted a bleed valve to the top of the stat and one to the top of the rad.

Hope that makes sense

coozer - 15/8/10 at 02:34 PM

If I understand that correctly I think you need to move the header tank connection to the bottom hose. You need a bleed pipe from the top of the stat housing to the header tank.

Got any pics?

Steve

austin man - 15/8/10 at 03:00 PM

unfortunately no pics the header tank is feeding straight into the stat housing.are you suggesting this one is blanked off ? and feed in via the bypass hose ?