Third Gen Thermostat Temperatures  dave8412  Jun 16 2006 -
9:48am     Q: How hot does my thermostat run?  A: Stock
thermostats on 3rd generation cars are 195 degrees. If you want
to go colder, you must change the PROM. This is due to the
computer having preset temperatures to determine warmup and fan
start conditions. A new PROM in conjunction with a thermostat
change will allow the car to maintain a cooler temperature by
moving the fan start temperature down to within the range of the
new thermostat. In addition, most PROM upgrades will lower the
warmup temparature so that the computer will not think that the
engine is constantly in warm-up (enrichment) mode. Changing the
thermostat without changing the PROM can lead to drivability
problem and less-than-expected results, but this varys with the
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