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The car will only have an overheat problem when mafunctioning, not when beind vehicles in traffic. Has the ambient temperature been hot on those occassions? Any other information than being behind traffic...? Any noises or other warning signs?
The system is reatively simple compared to other parts of the car. Something is blocking either air flow to the radiator or water circulation in the system, assuming it's holding coolant. So, you could have a failing water pump, sticky thermostat, a blocked radiator, or a mass of debris blocking air to the radiator.
If you're not seeping coolant at the pump or there is little play in the pump mountings (trying moving it from side to side), then I'd thoroughly clean and flush the system, replacing the thermostat and even the hoses, depending on when that last change may have been done. If you feel comfortable about removing the radiator, have it flushed and cleaned professionally or do it yourself. Water should flow freely through the system. If you're losing coolant, then I'd suspect the radiator, hoses or waterpump, but not necessarily in that order.
Did I forget anything BBsters?
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John Shatzer, '97 V90 @ 94K
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