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Thermostat Housing Crossover: Removal

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  1. Disconnect both battery negative cables. Drain the coolant from the radiator. See DRAINING & FILLING COOLING SYSTEM . Remove the air cleaner assembly from the vehicle.
  2. Remove the air intake duct from the turbocharger. Remove the nut securing the engine oil level indicator tube and the transmission fluid level tube at the thermostat housing. Remove the stud securing the fuel bleed valve at the thermostat housing.
  3. Remove the A/C compressor. See COMPRESSOR under REMOVAL & INSTALLATION in MANUAL A/C HEATER SYSTEMS article. Disconnect the coolant temperature sensor electrical connector. Disconnect the heater hose at the thermostat housing crossover.
  4. Disconnect the by-pass hose at the thermostat housing crossover. Disconnect the radiator inlet hose at the thermostat housing crossover.
  5. Remove the studs and bolts securing the thermostat housing crossover to the engine. Remove the thermostat housing crossover. See Fig 1. Clean the thermostat housing crossover sealing surfaces.
Fig 1: Identifying Thermostat Housing Crossover
G00307793Courtesy of GENERAL MOTORS CORP.
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