318 is not hot enough

180* Thermostats open at 180*.

So……. If your coolant is circulating fully you are:

At lest least at 180* and your gauge is wrong.

or

Your thermostat is opening early (or stuck open all the time).


Replacing your 180* with a 140* would do absolutely nothing or make things worse.


1. Verify the coolant temp with another measuring device (meat thermometer, another gauge).

If it is really 150*, replace the Stat with a new 180* unit.