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my name is XXXXX XXXXX have a 2003 pontiac grand am gt, V-6 ENGINE, with 55k miles on it,,,,,,my question is about the cooling system,,,,, everything seems to be ok but i have a few questions 1) i have always noticed, especially in summer, the temp guage would go up to about 210 to 215 then come back to normal which is about 200 degrees. 2) this past winter, the thermostat was stuck closed, the guage would only get to about 180 or so,,,,, the thermostat was not opening and i wasnt getting the proper heat in the car,,,,, i had the thermostat replaced,,, everything was fine,, the heat inside was good again,,, the temp guage would get to about 200 then hold steady there,,,, remember - this was during the cold weather months. now, with the warmer weather, here is what i am getting on the temp guage. 1) at about 200 degrees, the thermostat seems to be opening fine and on the colder mornings, i am getting good heat inside the car with no problem ( AND THE AC IS BLOWING COLD TOO WHE...

Cooling System Failure on  Chevy Vehicle  Q: Mechanic said  electrochemical degradation causing cooling system failure. It seems to be a hidden problem with some vehicles which causes radiator failure. I read a car-care article describing how to check for stray voltage using a DVM. So I took some measurements. I put the negative probe on the engine ground and positive in the coolant of the surge tank of my 2005 Chevy Equinox. I measured +200mVDC with the engine off and about +240mVDC with it running. The engine was only cool to warm when I did this cautiously. Is this too high of a voltage? Will this cause problems with my cooling system in the future? What can I do if it is a problem? A: First Off all i will say, Electrochemical degradation of the cooling system is a problem in today’s vehicles; this chemical reaction is called electrolysis. What is Electrolysis the details are a follows:--- Electrolysis involves an ion exchange between the coolant and th...