1998 Cadillac EL Dorado Thermostat

Removal
Drain the coolant.
Disconnect the negative battery cable.
Remove the air intake duct.
Disconnect the radiator hose.
Remove the thermostat housing.
Remove the thermostat. Clean all sealing surfaces
Installation
NOTE:Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the thermostat.
Install the thermostat housing using a new gasket.
Install the thermostat housing bolts. Tighten the thermostat housing bolts to 89 INCH lbs. (10 N.M).
Connect the radiator hose.
Install the air cleaner outlet duct.
Refill the coolant.
Start the engine.
Check for leaks.