OEM GMC Terrain Thermostat Housing

GMC Terrain Thermostat Housing Parts Questions & Experts Answers

• Thermostat Housing
  12689039
  Q: How to replace the engine coolant thermostat housing (LAF) on GMC Terrain?

  A:

  Draining engine block coolant at the Water Pump drain portion marks the first step for replacing the laf engine coolant Thermostat housing. After draining, ensure the drain bolt remains tight. Begin by lowering the vehicle then disconnect the engine wiring harness electrical connector at the engine coolant temperature (ECT) sensor. Start by clearing both the heated oxygen sensor (HO2S) electrical connector rosebud clip and relocating the radiator outlet hose clamp before removing the radiator outlet hose from the Thermostat housing. To proceed, users should first remove all Exhaust Heat Shield studs along with the Exhaust Heat Shield itself. The hvac heater inlet hose and outlet hose need removal from the Thermostat housing. Before removing the components start by raising your vehicle and removing the ect sensor if needed followed by both Thermostat housing bolts. Screw-tighten the water transfer pipe as you pull for removal from the Water Pump followed by removing the Thermostat and the water transfer pipe from the Thermostat housing (if applicable). Following the removal of water transfer pipe o-ring seals when needed discard them before removing the Thermostat cover bolts and cover. All debris and thread sealant needs to be cleaned from both ect sensor holes and bolt openings whenever reusing the housing. The installation process requires two steps: first place new Thermostat cover o-ring seals into the recess groove and then install the Thermostat (if required) before tightening the cover bolts to 10 nm (89 lb in). Place the new Thermostat housing to engine gasket on the Thermostat housing before positioning the assembly then applying a light coating of coolant on the water feed pipe seals. Start by putting new o-ring seals on the water feed pipe after you've treated them with coolant. Position the water feed pipe through the Thermostat housing while you guide the locator tab and adjust the water pipe to the Water Pump. Push the water feed o-ring seal toward the Water Pump until it reaches its proper seating position without damaging it. Then position the Thermostat housing against the engine block and torque the Thermostat housing bolts to 10 nm (89 lb in). Installation of the ect sensor requires a 20 nm torque (15 lb ft) where you should first coat its threads with sealant. Lower the vehicle and attach the hvac heater inlet hose with the hvac heater outlet hose to the Thermostat housing. You should replace the Exhaust Heat Shield followed by attaching the radiator outlet hose to the Thermostat housing before securing the radiator outlet hose clamp. Secure the engine wiring harness electrical connector to the ect sensor then add the ho2s electrical connector rosebud clip at the Thermostat housing. Lower the vehicle then open drain valves both at the radiator and Water Pump while filling the cooling system.