From searching the forum, I note that many of you opted to ADD a FPHE (Flat Plate Heat Exchanger) to bump your heat up. I have a few questions relative to additional heat (1984 300DT):

1. In adding a FPHE, where did you T to get coolant (from the hottest part on the engine side?)
2. Where did you add the fuel lines?

3. I currently have the long return coolant hose (from the veggie tank in the trunk) T'd in after the monovalve. Does that compromise heat? Has anyone moved it over to the engine side of things or does that mess with the circulation?

4. It would figure that of all my MB's, this one runs the coolest, with temps barely exceeding 80C on an 80F day at full load. Is there a way to change this by adding a higher tolerance thermostat or diluting with more water (perhaps my concentration of coolant is too high)

5. Would a non-functioning monovalve mess with the heat?

Thanks in advance for any help on the matter.

Diesel Don

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DAILY DRIVERS:
'84 300DT 298k (Aubrey's)
'99.5 Jetta TDI IV 251k (Julie's)
'97 Jetta TDI 127k (Amber's)
'97 Jetta TDI 186k (Matt's)
'96 Passat TDI 237k (Don's
'84 300D 211k Mint (Arne- Undergoing Greasecar Conversion)

SOLD:
'82 240D 229k (Matt's - Converted-300DT w/ 4 speed