Question about 1999 Cadillac DeVille
Where is the engine coolant temperature sensor located?
where are the three fan relays located
The coolant temp sensor is at the rear of the engine and is a "bad word" to get to. the 3 relays are at the bottom,under the fans. if you remove the driver side fan out of the way( 2 10mm bolts holding the fan) you should have good access to them. they do have locks on them and may be tricky to unplug. there is a 7/16 nut holding the relay plate down. remove and it should be easy to remove them.
Posted on Jul 09, 2008
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Posted on Jan 02, 2017
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The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.
When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.
The engine coolant temperature sensor is also utilized for control of the cooling fan.
Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines
Check this test procedure:
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