# I am shooting for cooler operating temps during this Fall and Winter...

Posted by Aaron (92 SE Auto) on September 26, 2003 at 13:29:14: In Reply to: It appears with your new Tstat posted by MIKE on September 26, 2003 at 05:52:39: The only way I got 183 was to coast down a hill with heater blasting. Before, I've never been able to get the temp below 190. Yes, it's still hot here. And unless you have a coolant temp gauge, you won't be able to tell how hot you're running. Go get a gauge and then I bet you're operating at 190-210 with AC off. With AC on, it can creep up to above 220 very easily. Also, keep in mind that I have an UDP. Which I guess udner drives the water pump. The 63 and 64mm is the diameter of the thermostat. If you remove the Tstat housing, you'll see that the 64mm Tstat fits perfectly in a groove. Nice and sealed up. The 63mm Tstat still seals. But anything smaller than 63 and I don't know how well it will seal. And you definitely can't go with a Tstat bigger than 64mm, no room. I will continue to test this 160 Tstat in different weather conditions. But right now in 95 degree weather, the car still operates at the normal 190-210 range with AC off. But I was able to get the temps to dip below 190 if I REALLY tried. Then turn off heater and get back on the gas for a while and the temps creep back up to above 190 again. That is how hot it is in Vegas STILL. Actually 90 degrees here feels very nice with 5% humidity. But it's still 90 degrees. : If you are getting 183 deg coolant temp @ 95 deg ambient temp it appears with your new Tstat you "shouldn't" be above 200 deg coolant temp again. Maybe on those exceptionally HOT Vegas summer days you probably will see above 200 deg coolant temp : What does 63mm or 64mm represent. Is that the diameter of the Tstat? : Are you planning on swaping Tstat for the summer and then again for the winter? Or with further testing are you hoping this new Tstat will be perfect year around? Replys:

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: The only way I got 183 was to coast down a hill with heater blasting. Before, I've never been able to get the temp below 190. : Yes, it's still hot here. And unless you have a coolant temp gauge, you won't be able to tell how hot you're running. : Go get a gauge and then I bet you're operating at 190-210 with AC off. With AC on, it can creep up to above 220 very easily. : Also, keep in mind that I have an UDP. Which I guess udner drives the water pump. : The 63 and 64mm is the diameter of the thermostat. If you remove the Tstat housing, you'll see that the 64mm Tstat fits perfectly in a groove. Nice and sealed up. The 63mm Tstat still seals. But anything smaller than 63 and I don't know how well it will seal. And you definitely can't go with a Tstat bigger than 64mm, no room. : I will continue to test this 160 Tstat in different weather conditions. But right now in 95 degree weather, the car still operates at the normal 190-210 range with AC off. But I was able to get the temps to dip below 190 if I REALLY tried. Then turn off heater and get back on the gas for a while and the temps creep back up to above 190 again. : That is how hot it is in Vegas STILL. Actually 90 degrees here feels very nice with 5% humidity. But it's still 90 degrees. : : : If you are getting 183 deg coolant temp @ 95 deg ambient temp it appears with your new Tstat you "shouldn't" be above 200 deg coolant temp again. Maybe on those exceptionally HOT Vegas summer days you probably will see above 200 deg coolant temp : : What does 63mm or 64mm represent. Is that the diameter of the Tstat? : : Are you planning on swaping Tstat for the summer and then again for the winter? Or with further testing are you hoping this new Tstat will be perfect year around?