SOURCE: 99 DODGE STRATUS RADIATOR OVERFLOW BOTTLE
Double check that your rad cooling fan is operating as it should, but after that, I'd be looking at a good rad flush, or rad replace. Believe it or not, your heater core is like a small rad, and when you turn the heater on, it actually cools the circulating coolant, slighly,and therefore shows a difference on your gauge. Like I said, make sure the rad fan is coming on when engine temperature is at normal or slightly higher, and if it is, then I'd be taking a close look at my radiator, especially if it wasn't replaced when headgasket was done.
SOURCE: why does my 98 deville continue to overheat?
check to see if there is a valve (usually vacuum actuated) inline somewhere on the lines that go from the block to the heater core. Maybe it is stuck...
SOURCE: Technical tuning specifications for a 1997 Toyota Conquest 1300
Don't know about the 97, but I have a 99 escort, 00 corolla, 00 camry and 98 Suburban (though thats diesel so a diffrent animal altogether)... prior to that an 86 and 88 vw quantum and golf respectively... once electronic ignition became standard, there wasn't much "tuning left to do". Change the spark plugs, wires, cap an rotor, pcv valve, air filter, and fuel filter and I think you did a "tune up". With platihnum plugs an such you don't change the plugs often (like once every 5 years or so... depends on the plug, look in your manual). Get the Bosch warranteed wires from a place with lifetime warranty... remember where you bought them..., anything less will fail...
O2 sensors and catalytic converters can be a horror show. Aftermarket replacement catalytic converters cost a few dollars (about 1/3 of dealer cost) but they contain about 1/5th of the metals needed for catalytic conversion, so they fail in about 1 to 2 years... if you plan to keep the vehicle longer, plunk the money down, of you like replacing the things, get the aftermarkets, again a leftime warranty would be a neat trick, O2 sensors - sometimes you can get away with a 35$ universal from the discount shop, I did nonthe vw's, I did not on the toyotas....
SOURCE: 1998 Cadillac DeVille Overheats
The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.
SOURCE: Toyota Tazz 1300 2004 overheating - Have replaced
have you replaced the thermostat? This controls the engine temp
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