I have a 1995 Pickup whose temperature guage has never (owned for 6
years) read quite right. It begins showing about 140F and at full
running temp (about 195F) still reads only about 1/4 scale. I can't
seem to find the temp sending unit to check if that is the problem.
Also lately, the thermostat has gone soft, but the only replacement I
can find is another 190+ degree, and I am wondering if there is a
source for any other temp - preferably around 160 to 175?
The sending unit should be near where the hose comes out of the block to
return to the top of the radiator.
I would stay with the factory thermostat. If you start running it that much
cooler, the computer will think it's still in warm up mode and add extra gas
and/or not start checking other parameters and you will probably see a drop
in fuel economy as well as drivability (throttle response, etc.). Gas
engines get more efficient the hotter they run, it's a matter of how hot the
materials can be that determines the thermostat to use.
Thanks for the info.
If all else fails, I will replace with the factory thermostat,
but at this time I am seeing temps between 140 and
160 with no significant loss of milage. As this truck
has nearly a quarter million miles on it, I am not too
concerned with performance - more interested in not
blowing hoses and gaskets. Any temperature thermostat
would help it warm up quicker though.
Ed H. wrote:
You will drastically increase the wear occurring in your engine by running
it that cool. Ed H is right about the efficiency of gasoline engines - what
goes along with that is cylinder wall wear and bearing wear is much much
less in engines that are running hotter. You should be working with a 195
degree temp thermostat. If you are having hose problems, replace them with
new and solve your worries.
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