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no freeze plugs are located on the sides of that engine... the front and back when viewed under hood.... i believe your resivoir- overflow is on the same side as you describe the leak so id check that first otherwise it seems youve a thermostat housing, intake manifold leak or another waterpump issue
Hi Chris,Your vehicle is a front puller with transverse engine. You need to remove the air cleaner housing and all allied units. Underneath it you will see a number of coolant pipes. There are those leading to the cold start system and the thermostat housing. Before beginning any work make sure the engine has stood until cold. When you have full visual you should be able to see stains where the coolant has leaked out. The marks are usually easy to distinguish. Do not remove pipes from a hot engine, as apart from the possibility of burning yourself, rapid changes in temperature may damage the engine. Make sure to fill with 40% coolant and add water to until full. Best regards Johngee10
NOTE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® (orange colored, silicate free) coolant meeting GM specifications. On these vehicles, if silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner; at 30,000 miles or 24 months.
Disconnect the negative battery cable.
Properly drain and recover the coolant until the level is below the thermostat.
Unfasten the coolant outlet-to-inlet manifold attaching bolt and nut, then remove the outlet.
Remove the thermostat. Clean the inlet manifold and outlet mating surfaces.
Install a new O-ring onto the thermostat
Place the thermostat in the inlet manifold.
Attach the coolant outlet to the inlet manifold, using the bolt and nut. Tighten to 89 inch lbs. (10 Nm).
Refill the engine cooling system.
Connect the negative battery cable, then start the engine and check for coolant leaks.
2.3L and 2.4L Engines NOTE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® (orange colored, silicate free) coolant meeting GM specifications. On these vehicles, if silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner; at 30,000 miles or 24 months.
Disconnect the negative battery cable.
Properly drain and recover the coolant to a level below the thermostat.
Unfasten the cover-to-outlet pipe bolt, which is accessible through the exhaust manifold runners.
Raise and safely support the vehicle.
Disconnect the radiator and heater hoses from the outlet pipe.
Unfasten the outlet pipe-to-oil pan bolt and the cover-to-outlet pipe bolts.
Remove the thermostat, then clean the old gasket material from the mating surfaces.
Position the thermostat in its correct location, then install the cover-to-outlet pipe bolt. Tighten the bolt to 10 ft. lbs. (14 Nm).
Install the outlet pipe-to-oil pan bolt. Tighten the pipe-to-oil pan bolt to 19 ft. lbs. (26 Nm) and the pipe-to-transaxle bolt to 40 ft. lbs. (54 Nm).
Connect the radiator and heater hoses to the outlet pipe.
Carefully lower the vehicle.
Install the cover-to-outlet pipe bolt through the exhaust manifold runner.
Properly fill the cooling system, then connect the negative battery cable.
The thermostat is located in the lower radiator hose on the 2.2L engine
Thermostat removal and installation - 2.3L and 2.4L engines
It should be at the front of the engine where the upper radiator hose is attached to the engine. The radiator hose will be attached to the thermostat housing with a hose clamp. The thermostat housing should have two bolts holding it in place. Remove the gbolts(engine cold) and raise the housing up, The thermostat will be underneath. Make sure the new thermostat is facing the rightway when you install it, Don't forget the gasket. Bolt the housing back in place and install the radiator hose and clamp. Replenish any coolant that was lost to bring the coolant level back up. Run the engine long enough for it to warm up. Check for leaks, monitor the temperatureguage to make sure it reaches normal temp without overhearing, and make sure the heater is blowing warm air.
If its leaking at the rear its probably not the pump, the pump is in the front. It could be the rear of the intake manifold gasket.Or a heater hose that routed over the rear of your engine. Someone really needs to see where the fluid leaking out to make the call. Try to get a good strong flash light on the leak.Maybe even try lay on you back and slideing under with the light and look up the back side of your engine while its leaking. Engine in park of course. Eye protection needed here. Lay off to the side and look up at an angle so you dont get the coolant on your face or skin. Wash well if you get wet.
Follow the upper radiator hose to the engine. Remove the hose. There are 3 bolts holding the thermostat housing in place, remove them. Remove the thermostat and clean all surfaces. Install new thermostat. Apply a thin amount of gray silicone sealer to the thermostat housing. Install housing and retaining bolts. Install hose and secure. Add coolant and check for leaks.
Sounds like either the water pump or the thermostat housing. The water pump has a small hole in the bottom where the shaft comes through, when the water pump gets worn it will leak here so you know to replace the pump. The thermostat housing will be at the motor end of the upper radiator hose where it attaches to the motor. Hope this helps.