my 93 has been running hotter than it has before. the guage is only about halfway but it never used to run that hot. i put a low temp thermostat in it last summer and replaced it when it started getting hotter, no change. i flushed the cooling system and nothing nasty came out. it wasn't low before and the mix was 50/50. turning off the A/C only cools it down a little. what else could i look for?