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Actually on the 90 2.3L model the coolant temp sensor is on the bottom of the intake manifold right above the oil filter.

AnswerThe temp sensor should be on the housing for your top rad. hose where it bolts to the engine, should have a plug with 2 to 3 wires or 3 vacuum hoses on it.

Please see the related link below for a video showing the location.

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