940 SE L4-2320cc 2.3L SOHC Turbo VIN 87 B230FT (1991)
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Remove battery negative lead.
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Unplug connector from sensor.
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Unscrew sensor.
NOTE: Keep a new sensor or a plug handy to prevent coolant from leaking out.
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Fit new unit.
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Reassemble In reverse order.
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Test drive and check coolant level, topping up if required.