Overheats With A/c On

[RX7 RAGE]

Hello, I just picked up a clean 1992 sc300 with a manual transmission and when I turn the A/C on, it will slowly rise to about 3/4ths up the gauge. It takes about 10-15 minutes to get there but when I turn the a/c off, it will drop back down to the halfway point. The car has 126k on the clock. Thanks for the help!

[jzz30]

does the car take kinda long to warm up? maybe the thermostat is half open or maybe it doesnt open all the way.

[RX7 RAGE]

Sometimes it does take a while to warm up to the middle section of the gauge, this points to a faulty thermostat? I'll go ahead and change the tstat and flush the coolant, thanks.

[VJZ]

I had the same situation on my old 1990 Celica with a 5SFE. The A/C system hadn't been used in years and was low on freon. After recharging, it would overheat. It ended up being my radiator.

[RX7 RAGE]

Well, it turned out my car didn't have a thermostat at all and my water pump was leaking! I got oem parts and the car runs cool again. :)