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Check the battery connection, under the rear seat.
The fuse boxes in a 1998 Cadillac Seville sls are located between the panel and the driver\'s panel.
The battery to a 1999 Cadillac Seville SLS is underneath the backseat of the car. The car manual explains how to remove the rear seat and gain access to the battery. It is much easier then it sounds.
The steering wheel cover on a 1998 Cadillac SLS is not secured with bolts or anything so it just takes force to remove it. It will not break so do not be afraid to use some strength to get it off.
Under the rear seat....
under the backseats under the backseats
it should be in your owners manual. but it should just be bolted down just unscrew those bolts and it should come out
remove the door panel screws and pull up on the door panel to correctly remove it. then remove the 3 bolts on the upper corner and unplug and replace
The thermostat on a 2001 Cadillac SLS is located in the radiator. To access it, remove the upper hose assembly after draining the radiator halfway.
Im pretty sure its under the back seat!!!!
How to Replace spark plugs on 2004 cadillac deville Sls with 4.6 v8 engine
you have to remove the intake manifold , the starter is under the intake ,but first disconnect the negative battery cable. that's all i know on this subject.