Originally Posted by Rogue
I just dropped to a 160 for the summer. Still trying to combat some KR so im keeping the engine cooler. I did not have any problems with my 180.
My '93 still has its original (what, 200º, is it?) in there at 112K and it'* been fine. Kept up to date on cooling system flushing now, too.
One interesting thing I noticed was that after I got the A/C fixed last summer, the running temperature _dropped_ slightly, and that includes driving through the winter when the compressor obviously was not operating and I assume the cooling fans weren't, either. The termperature gauge is now clearly a notch or two below the center mark (200º on the gauge, if I remember right) most of the time, whereas before, when the A/C was out and the HVAC display would do its two-minute Hey-I've-Got-an-Error-Code blinking every time I started the car, the gauge spent most of its time slightly higher on the scale, creeping well above 200º whenever I sat too long at a stoplight.
So I'm wondering if there'* some input into the ECM that changes its behavior if the Freon is low, or otherwise if the HVAC is reporting a problem, which results in a slightly higher running temperature. I know it doesn't seem like there should be, but my car has definitely been running a little cooler since the A/C was repaired, and the cooling system had not been touched at that time, or since.