Dear machine man,
Hope you're well and stay so. Getting a multi-meter probe on the Engine Coolant Sensor's (ECT) pins is hard, as space is tight.
Once the connector has been separated from the sensor, corrosion-remover can be sprayed, using the thin plastic tube supplied with the aerosol can.
There's just enough room to get a wrench on the sensor: a ratcheting box wrench works best. If the user has "small" hands, there's no need to loosen the exhaust manifold bolts.
Removing the ECT does not lead to a gush of coolant, at least not if the coolant overflow tank's cap is snug. At most, a few drops should leak.
Hope this helps.
Yours faithfully,
Spook
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