240 D coolant flow rate

I'm sizing a heat exchanger to do final veggie oil heat for a veggie conversion of a 240D. Does anyone know the coolant flow rate through the water pump? I'm looking for the approximate rate w/ the thermostat
closed, but anything will help.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.