[Vwdiesel] Direction of coolant flow in radiator

gary gbangs at cfl.rr.com
Wed Sep 1 23:01:10 EDT 2004

On my Rabbit and Passat TDI, the hose from the head goes to the top of
the radiator.

We are talking about the SIDE of the head vs the back of the head
correct? The fitting at the back of the head recirculates some water
back to the water pump.

Do you have the proper thermostat? There should be a flat disc on the
end of the shaft that controls by-pass flow.

I have no clue on the arrangement of a Vanagon radiator. How is airflow
managed through this radiator?


On Wed, 2004-09-01 at 20:13, Wade Yorke wrote:
> I have a Vanagon converted to 1.9TD.  When I run at about 3500 rpm on 
> the highway the water temperature gauge gradually increases until the 
> overheat light comes on.  I checked the coolant hose arrangement and it 
> seems that the hose from the head goes to the top of the radiator 
> instead of the bottom as shown in the Bentley manual.  I would have 
> thought that hot water entering the top would be correct as it would 
> have a tendency to drop as it cooled.
> If the hoses are in fact reversed, do you think it could be the reason 
> for the high coolant temperatures when the engine is under load?
> Wade Yorke
> '84 Westy  1.9TD
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