Cutlass Ciera FWD L4-151 2.5L (1982)
Coolant Temperature Sensor/Switch (For Computer): Description and Operation
Engine Temperature Switch (ETS)
This switch--located in the cooling system--is used on 1982 minimum function systems--4 cyl./98 cid except All W/5 speed manual trans and CA
W/4 speed manual trans.
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When coolant is cold, switch contacts are open, and when coolant is warm (above calibration point), contacts are closed.
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The ECM uses this switch to determine MC solenoid dwell.
NOTE: Once switch contacts close, opening the contacts with the engine running will have no effect.
