Can't find thermostat housing and how do I change the thermostat.

The thermostat housing is at the end of the upper radiator hose. There should only be 2 10mm bolts holding the thermostat housing to the engine. Remove the 2 bolts, pull the housing off of the engine. Remove the old thermostat. Clean everything around where the thermostat goes on the housing and the engine side. Install new thermostat with new o-ring seal. And reinstall housing. Top off cooling system and bleed any air out of system with bleeder that is ontop of housing.

1. • 1 Pop the hood and locate the thermostat. It's on the passenger side of the engine and has a plug leading into it.
     
   • 2 Unplug the thermostat housing from the engine block using the 3/8-inch ratchet and socket set. The housing will come off in your hand and then you can pull out the old thermostat.
     
   • 3 Scrape off the engine block and the thermostat housing's mounting surfaces with the gasket scraper. This is to ensure the replacement gasket seals correctly.
     
   • 4 Place the replacement thermostat into the engine block and place the gasket over the ends of the bolts in the thermostat housing to keep them aligned.
     
   • 5 Bolt the thermostat housing into the engine block using the 3/8-inch ratchet and socket set.
     

Read more: How to Change the Thermostat on a PT Cruiser ' eHow.com http://www.ehow.com/how_5643178_change-thermostat-pt-cruiser.html#ixzz1g9B0K8Go

Hello victoriaulre,

Below I will provide step by step instructions and diagrams.

1. Drain radiator.
2. Remove the air cleaner duct for access radiator hose.
3. Reposition the hose clamp( circled in red) and then remove the radiator hose from the thermostat housing.See image below.

4. Remove thermostat housing bolt/stud.

5. Remove the thermostat housing and gasket.
6. Remove he thermostat.
7. Clean the gasket surface on the thermostat housing and the engine block.

To install, reverse above procedure.
Torque the thermostat housing bolt/stud to 18 ft.lbs.
Fill radiator and check for leaks.

I hope this helps.

Regards,

Jerry

NOT A HARD JOB.DRAIN OUT SOME OF YOUR COOLANT UNTIL BELOW THERMOSTAT.REMOVE RADIATOR SUPPORT COVER THEN REMOVE THE AIR FILTER HOUSING.THEN LOOSEN REMOVE HOSE CLAMP TO THERMOSTAT HOUSING.THEN REMOVE THERMOSTAT HOUSING AND THERMOSTAT.THEN INSTALL NEW THERMOSTAT WITH NEW O RING ON THERMOSTAT. LUBRICATE NEW O RING.BESURE INSTALL NEW THERMOSTAT WITH THE SPRING END ON THE INSIDE OF THE HOUSING.TORQUE THERMOSTAT HOUSING BOLTS TO 89 INCH POUNDS.

Fig. 5: View of the thermostat and related components - 2.4L engine (click for zoom)


3.1L and 3.3L Engines

1. Disconnect the negative battery cable.
2. Drain the cooling system to a level below the thermostat housing.
3. Remove the air cleaner assembly.
4. Disconnect the surge tank line from the thermostat housing.
5. Remove thermostat housing-to-intake manifold attaching bolt and nut, then remove the housing.
6. Remove the thermostat.

Hope this helps.

3.7L Engine - Thermostat

1. Disconnect negative battery cable at battery.
2. Drain cooling system.
3. Raise vehicle on hoist.
4. Remove splash shield.
5. Remove lower radiator hose clamp and lower radiator hose at thermostat housing.
6. Remove thermostat housing mounting bolts, thermostat housing and thermostat .
   
   
   Fig. The location of the thermostat and its housing on the 3.7L engine (click for zoom)
   

To install:

1. Clean mating areas of timing chain cover and thermostat housing.
2. Install thermostat (spring side down) into recessed machined groove on housing assembly. Make sure rubber seal locating tab is positioned in the corresponding notch in the housing.
3. Position thermostat housing on timing chain cover.
4. Install two housing-to-timing chain cover bolts. Tighten bolts to 105 inch lbs. (12 Nm) torque.
5. Install lower radiator hose on thermostat housing.
6. Install splash shield.
7. Lower vehicle.
8. Fill cooling system.
9. Connect negative battery cable to battery.
10. Start and warm the engine. Check for leaks.

Hope helps (remember rated this).

You need talking with the parts guy at the GM dealer You need the "new" style thermostat housing to be able to change just the thermostat. So I ordered a new thermostat housing assembly. Here is what I got, a new aluminum two piece housing and thermostat. Hopefully tomorrow I can get this car back on the road and out of my shop.





2004-2007 Chevrolet Aveo Thermostat Housing MTC Part W0133-1624867

Or search HERE

Hope helped.

YOU NEED A HAYNES REPAIR MANUAL.BUT YOU DRAIN OUT SOME COOLANT DOWN ENOUGH WHEN YOU TAKE THERMOSTAT HOUSING OFF TO GET TO THERMOSTAT.ANTIFREEZE WONT GO EVERY WHERE.TO GET STARTED YOU HAVE TO REMOVE RADIATOR SUPPORT COVER.AND THE AIR FILTER HOUSING.LOOSEN THE HOSE CLAMP.THEN DETACH THE HOSE FROM THERMOSTAT HOUSING.THEN REMOVE THERMOSTAT COVER MOUNTING BOLTS THEN REMOVE HOUSING.BE PREPARED FOR SOME COOLANT TO SPILL WHEN YOU REMOVE HOUSING AND BREAK THE SEAL.BE SURE TO REMOVE ALL TRACES OF OLD GASKET MATERIAL AND OR SEALANT FROM HOUSING COVER.THEN INSTALL THE NEW THEERMOSTAT IN THE HOUSING WITHOUT USING SEALANT.MAKE SURE SPRING END IS DIRECTED INTO THE HOUSING.APPLY CLEAN ANTIFREEZE TO THE NEW O - RING ON THERMOSTAT FOR LUBRICATION BEFORE INSTALLATION.PUT EVERYTHING BACK VISA VERSA.TORQUE THERMOSTAT HOUSING BOLTS TO 89 INCH POUNDS.PUT HOSES TIGHTEN HOSE CLAMP.FILL UP THE COOLANT SYSTEM CRANK CAR CHECK FOR LEAKS.

remove top radiator hose from engine,it is connected to the thermostat housing,remove the two bolts that hold down the housing to the intake,lift off and remove thermostat,clean housing gasket and intake gasket install thermostat with spring facing down in engine,reinstall housing and hose,

THERMOSTAT REPLACEMENT

Removal Procedure
1.Remove the air cleaner and duct assembly.
2.Drain the coolant until the coolant level is below the thermostat. Refer to Draining and Filling Cooling System .
3.Remove the crossover exhaust pipe.
4.Remove the radiator hose from the thermostat housing
5.Remove the thermostat housing bolts and clean any sealer from the bolt threads.
6.Remove the thermostat housing and gasket.
7.Remove the thermostat.
8.Clean the mating surfaces.

Installation Procedure
1.Install the thermostat.
2.Install the thermostat housing and gasket.
3.Install RTV sealer, GM P/N 1052366 or the equivalent, to the thermostat housing bolt threads. .
4.Install he thermostat housing bolts.
Tighten
Tighten the bolts to 25 N.m (18 lb ft).
5.Install the radiator hose to the thermostat housing.
6.Install the crossover exhaust pipe
7.Install the air cleaner and duct assembly.
8.Fill the cooling system. Refer to Draining and Filling Cooling System .
9.Inspect the cooling system for leaks. Repair as necessary.

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