OEM Cadillac Seville Thermostat Housing

Cadillac Seville Thermostat Housing Parts and Q&A

• Thermostat Housing
  1647540
  Q: How to service and repair the thermostat housing and replace the water crossover on Cadillac Seville?

  A:

  Dehydration of the cooling system is the first step before beginning Thermostat Housing service followed by removal of the air cleaner assembly fuel injector sight shield vacuum tube disconnect from water housing crossover. After disconnecting the fuel regulator vacuum tube and air solenoid vacuum tube you must remove the Throttle Body. The service repair of the Thermostat Housing and replacement of the water crossover starts with removing the fuel rail bracket retaining nut at the rear lift bracket and the surge tank inlet hose from the fitting along with the surge tank inlet fitting and rear lift bracket bolt and rear lift bracket. The EGR Valve requires removal while disconnecting the egr inlet pipe nut from the exhaust crossover and replacing the EGR Valve inlet pipe that connects to the water crossover. First remove the bolt and flange of the egr inlet pipe from the water crossover before discarding the egr inlet pipe itself. Begin by disconnecting the electrical connector from the MAP Sensor followed by removing the evap emission canister purge valve and MAP Sensor itself. Apply j38185 hose clamp pliers (J38185) to detach the inlet Radiator Hose from the water housing crossover while removing the outlet Radiator Hose from the Thermostat Housing. First disconnect the Water Pump along with its 2 belt tensioner bolts linking it to the water crossover before removing the Water Pump belt tensioner. Disengage the water housing crossover's cable harness clip then move it out of the way before removing the heater hose from the crossover and removing the crossover from the engine. A thorough inspection should precede xcrossover water housing installation. Before installation slide two water housing crossover gaskets onto crossover retaining bolts and make sure they sit properly. Fit the water housing crossover into position before you start tightening its bolts by hand up to 25 nm (18 ft.lbs.). Secure the heater hose and cable harness clip to the water housing crossover and bolt the Water Pump belt tensioner to the water crossover with 10 nm (89 inch lbs.) of torque. Ueinstall the Water Pump while using the j38185 tool to attach the outlet Radiator Hose to the Thermostat Housing and the inlet Radiator Hose to the water housing crossover. After installation of the MAP Sensor connect its electrical connector before installing the EGR Valve and if the EGR Valve inlet pipe was removed do not forget to replace it. Start the new egr inlet pipe-to-crossover pipe nut by hand to avoid crossthreading before tightening it to 60 nm (44 ft. Lbs.). Next install the egr inlet pipe flange onto the water crossover then install the egr inlet pipe-to-water crossover flange bolt and tighten it to 25 nm (18 ft. Lbs.). First install the evap emission canister purge valve then mount the rear lift bracket over the water crossover before installing and tightening the rear lift bracket bolt to 24 nm (18 ft. Lbs.). Screw in and tighten the surge tank inlet fitting to 47 nm (35 ft. Lbs.) before installing the surge tank inlet hose into the fitting. Secure the fuel rail bracket retaining nut to the rear lift bracket with 4 nm (35 inch lbs.). The last installation steps involve connecting the air solenoid vacuum tube and fuel regulator vacuum tube and brake booster vacuum tube then adding the Throttle Body along with the fuel injector sight shield and air cleaner assembly while filling the cooling system.