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Larry, Automotive technical expert
Category: Car
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Experience:  30 years automotive technical writer, editor & author
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How do I replace a 2001 mitsubishi eclipse thermostat

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Submitted: 8 years ago.
Category: Car
Expert:  Larry replied 8 years ago.
The thermostat on your engine is inside a small housing on the end of the motor (see illustration below).

Wait to change the thermostat until the engine is cold.

Open the drain valve on the bottom of the radiator, and catch the coolant in a bucket. If the coolant is more then 3 years old, dispose of it (you can flush it down a toilet). Do not dump it on the ground or pour it into a storm sewer.

Follow the lower radiator hose to the engine, then unbolt the thermostat housing from the engine.

Remove the old thermostat, carefully clean all the old gasket gunk off the housing and the engine, then install the new thermostat and gasket so the jiggle pin is position up. The metal bulb part of the thermostat faces inward toward the engine. Use gasket sealer on the thermostat housing gasket.

Refill the cooling sysem with a 50/50 mixture of antifreeze and clean water (distilled water is best, XXXXX XXXXX use softened water because it contains salt).

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