Question about 1989 Cadillac Sedan DeVille
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Posted on Jan 02, 2017
SOURCE: 99 cadillac de ville
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
it's in the thermostat housing that is close to a belt driven water pump on the driver's side. Thermostat is hidden inside this housing.
Posted on Jun 30, 2010
Castrol 20w-50 in summer and 10W-40 in winter, is best in my opinion.
It is high detergent, to remove sludge.
The thinner oil, like 5W-30 is only for better mileage, but cause piston and camshaft wear.
Posted on Oct 07, 2010
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