13-08-2013, 05:50 PM
IMO stick with standard. The thermostat will need modifying to heat full time but this is straight forward. Remove the 10mm bolt in the centre to remove the housing, clean up the base, and refit with some gasket seal. Thermostat can be sealed up with some araldite once modified, water sensor (if fitted) and drain plug can likewise be sealed up. No more air leaks. I've never had a problem with fuel flow even on WVO and ragging it to 5k. If for some reason you wanted better flow a lot of 2.1 TD's have a larger housing and filter which would bolt straight on to a 1.9 and you retain the benefits of the built in heat exchanger which is essential in winter (again, IMO).