My coolant temp. was running 210-220 on the gauge. while changing the thermostat(to a 180) I noticed that my coolant was BROWN and nasty. I removed the thermostat housing and the lower radiator hose, turned on my water hose and let er run. I also flushed out the radiator and while I was at it I removed and washed out the overflow jug. After filling it back up with new antifreeze ,my temp stayed at about 190 on the gauge. The car seems ALOT more peppy and now I'm not hearing the clatter at WOT. I also changed my trans filter and installed my trans cooler. Might check your cooling system!

Haford please put the year and model of your car into the signature part of your profile.

If you had dexcool, then someone added green stuff at one point.

Putting that 180 in was the best thing you could have done.

What about the heater core? It still had coolant in it. I hope we don't have a mix of two different types of coolant in your system now. That'* very bad news.

I agree, your year and trim level in your sig would be a big help.