|Quote, originally posted by ARRR Matey 32 »|
|i disaggree. How can you test a poss, bad sensor within the cars own electronics and trust the reading? The whole reason why the sensor may be bad is because it reports a bad reading...|
Because the coolant temp is not regulated electronically (the thermostat
is a mechanical device), so the coolant temp itself will tend to stay around
190F regardless of whether the coolant temp sensor is good or not.
So if you drive the car until you *know* it is at normal operating
temp, and then see what coolant temp the sensor is reporting to the
ECU, if you consistently see less than about 180F, you can be pretty sure it's faulty.
And yes, the in dash temp gauge is mostly a placebo. It stays pointing
straight up for a very wide rand of coolant temps and only if you're
actually signficantly overheating or overcooling will you see it stray off
center. So even with a faulty coolant temp sensor the in dash gauge
may show normal.