OEM 2008 Cadillac CTS Thermostat

2008 Cadillac CTS Thermostat Parts and Q&A

• Q: How to replace the engine coolant thermostat (LY7, LLT) on 2008 Cadillac CTS?

  A: Start by partially draining the cooling system through the cooling system draining and filling (GE 47716) procedure when replacing the engine coolant Thermostat (LY7, LLT). After removing the upper Intake Manifold and disconnecting the surge tank outlet pipe from the Thermostat focus on the radiator surge tank outlet hose/pipe replacement (LLT) procedures. Remove the Thermostat's three hardware components starting with the coolant pipe/Thermostat housing bolt then the coolant pipe upper bolt and finally the coolant inlet pipe. To remove the Thermostat you must first remove the Thermostat bolts before discarding the Thermostat seal. Fasten the new Thermostat by applying new Thermostat seal then tighten the Thermostat bolts to a torque of 10 n.m (89 lb in). Reinstall with a new seal along with fasteners (2 and 7) to reinstall the coolant pipe before you connect the surge tank outlet pipe to the Thermostat and install the upper Intake Manifold. Complete cooling system filling based on the cooling system draining and filling (GE 47716) procedure.