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Originally Posted by Arrowshooter
In searching other posts concerning temperature guages i could not find where exactly 180 degrees is supposed to be on a 1998 with a 5.7. The engine will warm to about two lines before the 210 degree mark then drop down to below the larger line between 100 and 210. After that it will gradually work its way up to one line above the halfway point. I am assuming that the halfway point is about 160 given a perfect world and the guage is acurate. I only bring this up because on a recent trip to the smog shop I barely passed and was told that my engine was not warm enough. This was after a 45 minute drive from work. Being as the guage reacts as is does while warming up, my guess is that thermostat is working but is the wrong temperature and needs to be replaced.
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Thermostat is a Good place to start.
One of them no touch laser tempture guns works slick on telling what the tempt is.
Point it and pull the trigger and you got it.
A good OEM thermostat should hold it around 195 degrees.
MT