Cold Starting 1.9JTD

The 156[1] has been a nightmare for the past month or more,
with a ritual of parking nose in under the car port for the
night with the battery charger plugged in, and using a heat
gun over the fuel lines and into the air intake, still
taking at least 5 or 6 attempts to get it to fire.

The past 2 mornings, however, were possibly the coldest
it's been so far, and it started first click!

Notably the glow plug light seemed to stay on longer, and
it ticked over at 1k for a while, whereas previously
tickover was below 1k

Is it possible that the temp sensor is faulty?

[1] *Not* the i159

--
Rob Pearson
156 1.9jtd sportwagon (now)
164 V6 Lusso (gone)