Originally Posted by Peter
Coolant temperature sensor. Not the single wire one that
feeds the dummy light, the other one. $20 at Autozone and
a PITA to install.
Somebody PM'd me about this, so I figured it would
be a good idea to share it with the thread.
There are two coolant temperature sensors.
One of them powers the stock gauge - which is about
as useful as the oil dummy light (not at all ...).
That one doesn't do jack to how your car runs.
The other one is what your ECU uses to figure out
the operating temperature, which has a lot to do
with how your car runs.
Wells p/n: SU405 available at Autozone for $17.99.
I don't know the Nissan p/n, but it's about the same price.
It's down under the air/idle assembly on the intake manifold
next to the passenger strut tower, near the oil filter.
The other one, which won't actually help the accuracy of
your gauge, but you may decide to replace while you're
there for the hell of it, is:
Wells p/n: TU84, for $8.99 at Autozone.
Credit goes to Ray Kawski for giving me the head's up on
that one a while back on the NE SE-R list.