Question 1

How to replace the Engine Coolant Thermostat Housing (RPO LNJ) (3.4L) on Chevrolet Equinox?

Accepted Answer

Replacement of the engine coolant Thermostat housing (RPO LNJ) (3.4L) should begin by removing the fuel injector sight shield first. Pump out coolant until you reach a level below the measurement position of the Thermostat. Start the procedure by disconnecting both pipes from the Thermostat housing: crossover Exhaust Pipe and Radiator Hose. Begin by cleaning the Thermostat housing bolts threads before removing both the Thermostat housing and Thermostat. Caretfully clean both surfaces before installing the Thermostat while mounting it into the housing. Use gm p/n 12378478 (Canadian P/N 88900041) or an equivalent rtv sealer on the Thermostat housing bolt threads before installing the Thermostat housing bolts to 25 n.m (18 lb ft) torque specifications. After reconnecting the Radiator Hose to the Thermostat housing install the crossover Exhaust Pipe. To complete the procedure install the fuel injector sight shield, fill the cooling system and perform leak inspections while repairing as needed.

Question 2

How to replace the thermostat housing outlet on Chevrolet Colorado?

Accepted Answer

Draining the cooling system represents the first step in removing the water outlet housing. Insert hose clamp pliers (J 38185) around the clamp to separate the radiator outlet hose from its attachment to the water outlet housing. Begin by removing the bolts which secure the power steering pump bracket to the water outlet housing. After that, remove the water outlet housing from the Cylinder Head. Check both the water outlet housing for cleanliness while inspecting the sealing surface of the Cylinder Head. Place the water outlet housing onto the Cylinder Head before mounting water outlet housing bolts and applying a torque of 10 nm (89 inch lbs.). Install the power steering pump bracket while using hose clamp pliers (J 38185) to connect the radiator outlet hose to the water outlet housing. After starting the engine the process ends with fixture of the coolant and verification of leak-free sealing surfaces.

Question 3

How to replace the engine coolant thermostat housing (LE5) (2.4L Non Hybrid) on Chevrolet Malibu?

Accepted Answer

To perform the replacement of the engine coolant Thermostat housing (LE5), one must take into consideration draining the cooling system utilizing the given drain at the bottom side of the Water Pump for the purpose of engine block coolant drainage. Take off the Water Pump Drain Plug to drain coolant off the engine block and then lower the vehicle. Remove the bracket and disconnect the engine coolant temperature (ECT) sensor and the heated Oxygen Sensor (HO2S) electrical connector clip. Before you remove the radiator outlet hose, you should remove ect sensor and surge tank outlet hose as well as reposition the radiator outlet hose clamp. Next, undo the bolts that hold the Exhaust Heat Shield and take out the heat shield, then reclamp and take off the heater inlet and outlet hose clamps from the Thermostat housing pipes. Before taking the Thermostat housing off, remove the Thermostat housing bolts by twisting the water transfer pipe and pull it off the Water Pump. Removing the Thermostat housing. If needed, remove the water transfer pipe from the Thermostat housing and dispose of the o-ring seals. Undo the Thermostat housing cover bolts and housing cover, the Thermostat if necessary while making sure to clean any debris and thread sealant from the ect sensor and bolt holes if the housing is to be used again. Again for installation, fit a new Thermostat housing o-ring seal to the recess groove, fit the Thermostat if it is required, and bolt the cover to 10 nm (89 lb/ in). Install a new Thermostat housing to engine o-ring seal on Thermostat housing, load the assembly into place, and lubricate the water feed pipe seals with a little coolant. Place new o-ring seals on water feed pipe and put it into the Thermostat housing properly align with the locator tab and seat the o-ring seal press toward the Water Pump, and avoid damaging it. Placed the Thermostat housing against the engine and tighten the housing bolts to 10 nm (89 lb in) and reconnected the heater inlet and outlet hoses to the housing pipes of the Thermostat making sure that the clamps are well in position. Reinstall the Exhaust Heat Shield along with the bolts and tighten them to 23 nm (17 lb ft) and fit the radiator outlet hose to the Thermostat housing and tighten the surge tank to the housing using clamps. Seal the threads of the ect sensor, mount it, and tighten to 20 nm (15 lb ft), then reconnect the ect sensor electrical connector and the ho2s electrical clip connector. Finally, apply sealant gm p/n 12378521 (Canadian P/N 88901148) or equivalent to the Water Pump Drain Plug, install it, and tighten it to 20 nm (15 lb ft). Make sure the vehicle is leveled, check the shut off of the drain valves located on the radiator itself and Water Pump, fill up the cooling system, and check for any leaks to guarantee the fix.

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