Can't figure this out! Have flushed radiator and replaced with new coolant. Sporadic over-heating, usually in Winter. Added stop leak since fluid was continually low, does not seem to accept coolant from resevoir. Blows cold air until gauge is far too high and then comes back down to mid-range. Will change thermostat and hope for the best! Any suggestions on problem or BEST way to change thermostat as I've had problems with bolts stripping in the past. Thanks a million!!
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Re: '98 Century--Sporadic over-heating
Be sure to have heater (not defrost) on when refilling rad with coolant, and leave cap off until rad fan has come on & off 2 or 3 times, then replace cap. Airlocks are common on vehicles cooling systems, and will cause symptoms you are describing.
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Check condition and operation of thermostat. Check operation of radiator cooling fan when hot. Check radiator coolant level. If low, then perform a cooling system pressure check to identify cause of leak. Check coolant condition. If using water only, then corrosion may build up within system and cause blockages. If blocked, then flush system and refill with anti freeze-water mixture of 50/50.
Not all radiators have them, just remove the lower radiator hose and spray hot water through it from the top till it comes out clear, usually works better anyhow... Note: if your coolant is nasty and all brown and gummed up its cause you have a leaking intake gasket and oil is mixing with your coolant,, if this is the case you may have to replace the radiator as well as the gasket on the intake..
follow your top radiator hose to top of the engine, where it hooks up with a hose clamp. under that metal housing is your thermostat! usually 2 or 3 bolts you remove , then lift off the metal housing and take out your old thermostat and remove the old gasket with a razor blade.. install your new thermostat and gasket and away you go!! richie
try flushing the system.you may have some restrictions in the motor, but first remove the radiator cap before it gets to hot,but hot enough for the thermostat to be open,and make sure you have flowing coolant.If not your water pump is bad.The fluid should be moving quite a bit.