Maybe the thermostat design is suspect on these 1.9s.  I noticed right away
after I sold my beloved '86 that this '85 1.9l had heat much sooner than
the '86.  I wrote in to the list that I thought the thermostat was stuck
open, allowing coolant to travel front sooner.  I had heat sooner, but the
engine ran cooler.  Everyone wrote back that it means the thermostat is
working correctly, allowing the engine to heat sooner!  I don't know...
The 1.9s do seem to be over-designed in the cooling department.  It was
like they wanted to be on the safe side and installed this massive radiator
and metal pipes running to the front.  I would guess the metal pipes
radiate much more heat than the plastic 2.1 pipes.

                                                                        Jay