2003 model - my mechanic says my computer box has to be replaced. Is that true?
Before you spend money ( and you have doubts) get a second opinion and run the fault codes . There is a problem in that the thermostat has nothing to do with the ECM ( computer box) all it does is control the water temperature in the cooling system by opening and closing according to the coolant temperature
water temperature sensors send signals to the ECM so that the ECM can adjust the air/fuel mixture according to the engine temperature . Talk around as it may save you heaps of cash.
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