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The thermostat on A 5.0L grad marq with SEFI is found on the front of the motor, under a housing. Follow the upper radiator hose back, and itll be at the end of the run under a steel half-sphere. Unbolt the housing, loosen the hoses and be farwarned, its a tight squeeze.

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Q: Where is the thermostat located on a 1988 Mercury Grand Marquis 302?
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