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Drain the radiator, remove the two bolts on the upper hose (intake manifold) side and remove the thermostat. Install in reverse order and don't forget to burp the system, fill the radiator system and keep squeezing the hose to get the air out otherwise you will overheat.

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13y ago
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Q: How do you install a thermostat for 1992 Lexus sc400?
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