Question about 2001 Chevrolet Impala

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01impala cross over exhaust

I took off the cross over pipe(3.4L) shield and pipe to replace thermostat and when i was putting the pipe back on I noticed that aside from the 3 holes there is a half moon cut out on the outside edge of flange,I didn't noticed how/what position they came off in. My question is does it matter how/what position they go back on??

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Yes thats why it is half moon shape look under the hood of the same car

Posted on Mar 08, 2009

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Having a promblem taking off crossover exhaust pipe on a 2005 Buick rendezvous I tooken off the two front exhaust Then took bottom two bolt . But still fasten to something is there other bolts...


Thermostat? engine cooling?
2 engines, here, LYA adn LY7.
nobody here posts engine, why do that?
so ill post only for 1.
the LA1
here are the steps.
NO FSM Sux huh? nor an alldata.com account, why not that? 15 bucks?


STAT out.
Remove the air cleaner and duct assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 3.4L.

Drain the coolant until the coolant level is below the thermostat. Refer to Cooling System Draining and Filling (Refer To List 1) .

Remove the crossover exhaust pipe. Refer to Exhaust Crossover Pipe Replacement (Refer To List 2) in Engine Exhaust.

Remove the radiator hose from the thermostat housing.

Remove the thermostat housing bolts and clean any sealer from the bolt threads.

Remove the thermostat housing and gasket.
remove STAT
next is crossover page.

Disconnect the battery ground (negative) cable. Refer to Battery Negative Cable Disconnection and Connection (Refer To List 1) in Engine Electrical.

Remove the throttle body air inlet duct.

Drain the coolant from the cooling system. Refer to Cooling System Draining and Filling (Refer To List 2) in Engine Cooling.

Remove the inlet radiator hose from the engine. Refer to Radiator Inlet Hose Replacement (Refer To List 3) in Engine Cooling.

Remove the thermostat bypass pipe. Refer to Thermostat Bypass Pipes Replacement in Engine Cooling.



Remove the exhaust crossover heat shield bolts.

Remove the exhaust crossover heat shield.
  1. Remove the exhaust crossover pipe studs/nuts.
  2. Remove the exhaust crossover pipe.

end , remove.

now the bypass pipe FWD cars SUCK
  1. Disconnect the left engine mount strut from the engine.
  2. Remove the heater hose from the bypass pipe.
  3. Remove the thermostat bypass pipe to throttle body nut.
  4. Use the J 38185 in order to remove the thermostat bypass pipe hose clamps (1,5).
  5. Remove the thermostat bypass pipe to cylinder head nut (3).
  6. Remove the thermostat bypass pipe bolt (4).
  7. Remove the thermostat bypass pipe hose.
  8. Remove the thermostat bypass pipe.
sigh.....
why not log in to alldata.com
read the page then ask ques tons that are not clear.
and next time post the engine type.
above is just 1 engine.

Jun 18, 2014 | Cars & Trucks

1 Answer

Change thermostat


drivers side of engine on the back between exhaust manifold have to remove heat shield and coolant cross pipe to get to it

Jan 08, 2014 | 2001 Pontiac Grand Am

1 Answer

What to disassemble to change thermostat


You will need to remove your air cleaner and duct assembly. You will then see the thermostat housing sandwiched between the back of the intake manifold and the exhaust crossover pipe. The service manual says to remove the exhaust crossover pipe, but trust me, you do not want to attempt this unless you have access to a torch to heat the nuts that hold the thing to the exhaust manifolds. If you break a stud, then you are going to be removing an exhaust manifold for broken stud removal. If you take the 8mm screws out of the heat shield on the exhaust crossover pipe, you can wiggle the heat shield out. This will provide enough room to get the lower thermostat housing bolt out. It is a pain to do it this way, but it works and will prevent broken exhaust pipe studs. Sometimes the little 8mm bolts will also break, but since they only hold the heat shield, it is of no great consequence.

Then all you have to do is remove the two bolts that hold the thermostat housing to the manifold. The thermostat is directly under it.
Then the only other real "trick" is getting the thermostat and O-ring to stay in the correct position while you put the thermostat bolts back in. A trick that I use is a small wooden wedge. I put the thermostat housing into place over the thermostat and O-ring, then place mt wedge between the thermostat housing and the crossover pipe to hold the thermostat housing in place while I start the bolts. Otherwise, the thermostat tends to slide out the bottom while you are trying to get the bolts started.

Let me know how it goes...

Jun 16, 2012 | 2002 Buick Rendezvous

1 Answer

How do i get the thermostat on a 99 chevy lumina


I would assume, since you did not bother to mention, that you are talking about a 3.1L V-6 engine? Why would you think that the intake manifold would have to come off? The exhaust cross-over pipe and heat shield is what is in the way. The heat shield comes off of the crossover pipe rather easilly. This provides a little clearance. The lower thermostat housing bolt does not have to come all the way out. It just has to be unscrewed far enough to get the housing up and over the thermostat. The hole in the lower end of the housing is slotted. It is a real pain, but the only thing that I have found that works is a box-end wrench (one tiny turn at a time). Other than that, the easy way is to remove the exhaust crossover pipe. However, I do not recommend trying this unless you have a torch to heat the nuts that hold it on (unless you feel like replacing broken studs).

Apr 14, 2012 | 1999 Chevrolet Lumina

1 Answer

My husband and I are trying to get to our thermostat to change in my 2002 rendezvous, but there is a metal pipe in the way that we can't figure out how to remove. just behind the pipe, is a metal plate...


Hello vocalviixen,

The pipe that you referred to is the exhaust crossover pipe. Below I've included removal and installation instructions.

Also, the procedure for bleeding the coolant system is critical; if you need those instructions please post the question.

REMOVAL PROCEDURE
1. Disconnect the battery ground (negative) cable.
2. Remove the throttle body air inlet duct.
3. Drain the coolant from the cooling system.
4. Remove the inlet radiator hose from the engine.
5. Remove the thermostat bypass pipe.
6. Remove the exhaust crossover heat shield bolts.
7. Remove the exhaust crossover heat shield.
8. Remove the exhaust crossover pipe studs/nuts.
9. Remove the exhaust crossover pipe.
INSTALLATION PROCEDURE
1. Install the exhaust crossover pipe.
2. Install the exhaust crossover pipe studs/nuts.
3. Tighten the exhaust crossover pipe studs/nuts to 18 lb ft.
4. Install the exhaust crossover heat shield.
5. Install the exhaust crossover heat shield bolts.
6. Tighten the exhaust crossover heat shield bolts to 89 lb in.
7. Install the thermostat bypass pipe.
8. Install the inlet radiator hose to the engine.
9. Fill the cooling system with engine coolant.
10. Install the throttle body air inlet duct.
11. Connect the battery ground (negative) cable.


Regards,
netvan

Mar 14, 2011 | 2002 Buick Rendezvous

1 Answer

Location of thermostat on 2002 olds alero 2.2


Thermostat Removal & Installation 2.2L Engine To Remove:
  1. Remove the exhaust manifold. If equipped with an automatic transmission.
  2. Drain the cooling system.
  3. Remove or disconnect the following: chevy_cav_02-04_tstat.gif

    • Thermostat housing to water pump feed pipe bolts. chevy_cav_02-04_feedpipe.gif

    • Thermostat housing to water pump feed pipe.
    • Thermostat.
To Install:
  1. Install or connect the following:
    • Thermostat.
    • Thermostat housing to water pump feed pipe.
    • Thermostat housing to water pump feed pipe bolt.
      1. Tighten bolt to 89 in lbs (10 Nm).
    • Exhaust manifold if equipped with an automatic transmission.
  2. Fill the cooling system.
2.4L Engine To Remove:
Thermostat assembly 2.4L 87953024.gif

  1. Drain the cooling system.
  2. Remove the exhaust manifold heat shield.
  3. Remove the coolant inlet housing mounting bolts through the exhaust manifold.
  4. Raise and safely support the vehicle.
  5. Remove the coolant inlet housing stud from the oil pan.
  6. Remove wheel and tire assembly.
  7. Remove the engine splash shield.
  8. Remove the mounting bolts from the transaxle-to-engine block support. Remove the support.
  9. Remove the coolant housing pipe.
  10. Remove the thermostat.
  11. Clean the mating surfaces.
To Install:
  1. Install the thermostat.
  2. Install the coolant housing pipe.
  3. Install and secure the transaxle support-to-engine block mounting bolts.
  4. Install the engine splash shield.
  5. Install the wheel and tire assembly.
  6. Install the coolant inlet housing stud to the oil pan.
    • Tighten to 19 ft lb (26 Nm).
  7. Lower the vehicle.
  8. Install the coolant inlet housing bolts through the exhaust manifold.
    • Tighten the coolant inlet housing bolts to 10 ft lb (14 Nm).
  9. Install the exhaust manifold heat shield.
  10. Fill the cooling system.
  11. Inspect the system for leaks.
3.4L Engine To Remove:
  1. Drain the cooling system.
  2. Remove the air cleaner.
  3. Remove exhaust crossover pipe.
  4. Disconnect the surge tank line fitting from the coolant outlet.
  5. Remove the thermostat housing to intake manifold bolts.
  6. Remove the thermostat housing outlet and thermostat.
To Install:
  1. Install the thermostat and housing outlet.
  2. Install the thermostat housing bolts.
    • Tighten the thermostat housing bolts to 18 ft lb (25 Nm).
  3. Install exhaust crossover pipe.
  4. Connect the surge tank line fitting to the coolant outlet.
    • Tighten the fittings to 15 ft lb (21 Nm).
  5. Install the air cleaner.
  6. Fill the cooling system.
  7. Inspect the system for leaks
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Oct 14, 2010 | Oldsmobile Alero Cars & Trucks

2 Answers

Where is the thermostat on a 2.2l ohc engine?


Removal & Installation 2.2L VIN 4 To Remove:
  1. Drain the cooling system.
  2. Remove the lower radiator hose from thermostat housing.
  3. Remove the thermostat housing bolts and outlet.
  4. Remove the thermostat.
  5. Clean the mating surfaces.
To Install:
  1. Install the thermostat.
  2. Install the thermostat housing and bolts.
  3. Install the coolant housing bolts. Tighten bolts to 14 Nm (10 ft. lbs.).
  4. Install the lower radiator hose to thermostat housing.
  5. Fill the cooling system.
  6. Inspect for leaks.
2.2L VIN F To Remove:
  1. Remove the exhaust manifold. If equipped with an automatic transmission.
  2. Drain the cooling system.
  3. Remove or disconnect the following: chevy_cav_02-04_tstat.gif

    • Thermostat housing to water pump feed pipe bolts. chevy_cav_02-04_feedpipe.gif

    • Thermostat housing to water pump feed pipe.
    • Thermostat.
To Install:
  1. Install or connect the following:
    • Thermostat.
    • Thermostat housing to water pump feed pipe.
    • Thermostat housing to water pump feed pipe bolt. Tighten bolt to 10 Nm (18 in. lbs.).
    • Exhaust manifold. If equipped with an automatic transmission.
  2. Fill the cooling system.
2.4L VIN T To Remove:
  1. Drain the cooling system.
  2. Remove the exhaust manifold heat shield bolts and shield. cavman.gif

    cavtstat.gif

  3. Remove the coolant inlet housing bolts.
  4. Lift vehicle.
  5. Remove the coolant inlet housing stud from the oil pan.
  6. Remove the wheel.
  7. Remove the right engine splash shield.
  8. Remove the transaxle-to-engine block brace bolts and brace.
  9. Remove the radiator outlet pipe.
  10. Remove the thermostat.
  11. Clean the mating surfaces.
To Install:
  1. Clean the mating surfaces.
  2. Install the thermostat.
  3. Install the radiator outlet pipe.
  4. Install the transaxle-to-engine block brace and install bolts.
  5. Install the right engine splash shield.
  6. Install the wheel.
  7. Lower the vehicle.
  8. Install the exhaust manifold heat shield and bolt.
  9. Tighten the exhaust manifold heat shield bolts to 14 Nm (10 ft. lbs.).
  10. Fill the cooling system.
  11. Inspect the system for leaks.
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Sep 09, 2010 | 2003 Pontiac Sunfire

1 Answer

How do i change my thermostat on my 2001 pontiac aztek. also how do i remove the crossover exhaust pipe to get to the @#$%^ing thing?


Exhaust Crossover Pipe Replacement
Removal Procedure
  1. Disconnect the battery ground (negative) cable.
  2. Remove the throttle body air inlet duct.
  3. Drain the coolant from the cooling system.
  4. Remove the inlet radiator hose from the engine.
  5. Remove the thermostat bypass pipe.
  6. Remove the exhaust crossover heat shield bolts.
  7. Remove the exhaust crossover heat shield.
89160026

  1. Remove the exhaust crossover pipe studs/nuts.
  2. Remove the exhaust crossover pipe.
  1. Remove the air cleaner and duct assembly.
  2. Drain the coolant until the coolant level is below the thermostat.
  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.
Removal Procedure

89153578

Dec 11, 2009 | 2003 Pontiac Aztek

1 Answer

Locate thermostat 2002 alero


THERE A CROSS OVER EXHAUST PIPE TO THE FRONT EXHUAST MAG ON BACK OF THE ENGINE OVER THE TRANS RIGHT IN BACK OF THAT PIPE CENTER OF THE BACK OF THE ENGINE.

Nov 03, 2009 | 2002 Oldsmobile Alero

2 Answers

Thermostat location


The thermostat is in a difficult position. Follow the upper radiator hose and it leads into the block under the throttle body. 
Remove the air filter assembly and you'll c what is the exhaust manifold crossover pipe right in front of the thermostat housing.
 NICE, it gives you very little room to remove the 2 bolts to the housing and once u remove those then you'll find you have the thermostat housing loose but because of that darn exhaust manifold crossover pipe u don't have enough room to take the thermostat housing out to change the stinking thermostat. 
So from what you can see, you have to remove the heat shield which is cased around the exhaust manifold crossover pipe and if you still can't get enough room to remove the thermostat, (which you amy find out)then you'll have to remove the crossover pipe as well just to change the thermostat. 
If you have to remove the crossover pipe then their are 2 bolts on both ends of the pipe leading into the manifolds. But then the tough parts done and once u switch the thermostat over and ATTENTION:remove any old gasket material and put a new gasket in it's place then installation is reverse of removal. 
Good luck and hope this helps,

May 08, 2009 | 1993 Chevrolet Lumina

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