Replace thermostat on 3.1 engine - 1995 Oldsmobile Cutlass Ciera

Generally you locate where the thermostat is located. Usually you can follow the upper radiator hose from the radiator to the engine. The thermostat is usually between the end of the hose and the motor under a housing that is bolted to the engine with 2 or 3 bolts, On a cool engine remove these bolts and replace the thermostat. Some cars may be different.

Follow the top heater hose to the engine. Where the hose connects to the engine is where your thermostat is located. Usually 2-3 bolts holding on. Replace thermostat. Be careful to note which way the thermostat comes out of your engine. They only work one way.

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.

Holts Wondarweld
Flush engine.
EXTERNAL CRACKS
1 Run engine until hot,drain off enough coolant to remove thermostat.
2 Remove thermostat.
3 Mix contents of can thoughoughly! and pour contents into thermostat opening.
4 Replace thermostat cover.& fill radiator with hot water,replace radiator cap.
5 Run engine at a fast idle for 15 mins,dont allow to boil.Top up if necessary.
6 Leave Wondarweld in system for 2-3 days then drain off,flush system replace thermostat and refill.
HAIRLINE CRACKS
1 MIX thoroughly and pour into cold engine (radiator if it has a cap)
2 Run engine until hot.
3 Allow engine to cool then run again until hot.
4 Follow procedure 6 above.
INTERNAL CRACKS
1 Follow external crack instructions except after pouring Wondarweld into engine remove spark plug from
affected cylinder and run engine for 20 mins. If more than one cylinder affected run for 5 minute intervals.
2 Allow engine to cool then drain cooling system and refill with clean water.
3 Drain sump & flush,refill with fresh oil.
Note:- 1/2 pint of Wondarweld for every 6 pints of water,DO NOT add antifreeze for at least 3 days after process.

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

remove the coolant cap to relieve the pressure. Follow the radiator hose to the motor. The metalic/aluminum part that the hose is connected to holds the thermostat. 2 or 3 bolts hold it to the engine. remove these bolts & the thermostat. there may or may not be a gaket with your model. If so, replace them both. You will lose some coolant. add coolant when you're done, Make sure the engine is cold when u do all this.

it is located on the engine (block - in the front).

Make sure the engine is completely cool prior to working on the engine. Then place the drain pan underneath the radiator. Open the petcock at the base and let out approximately 1 gallon of coolant.

2

Unbolt the thermostat housing from the front of the engine using the 3/8-inch ratchet and socket. Coolant will pour out at this point, so be ready for it and aim the hose toward the drain pan if possible. Remove the thermostat and the thermostat gasket.

3

Clean all of the mating surfaces on the engine and thermostat housing using the gasket scraper. Then install a replacement thermostat in the housing, with the thermostat orienting the same way as the original. Then install the gasket and the thermostat housing on top of it. Bolt it in place using the 3/8-inch ratchet and socket.

4

Open the radiator cap and fill the radiator with the 50-50 pre-diluted coolant. Turn on the car and let it run for 15 minutes while the interior heat is set on the "high" position. Allow the car to cool for an hour, then add any additional coolant needed

Read more: How to Replace a Thermostat in a 2001 KIA Sephia ' eHow.com http://www.ehow.com/how_6111510_replace-thermostat-2001-kia-sephia.html#ixzz16b3EiQc8

It Depends on which engine you have, this is how it goes for both. I use a little RTV with a new ring as well.

THERMOSTAT REPLACEMENT (4.2L ENGINE)
Removal Procedure
1. Remove the necessary coolant from the radiator.
2. Remove the generator.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
4. Remove the thermostat housing bolts.
5. Remove the thermostat housing from the engine block.
6. Clean all of the surfaces of the thermostat housing.
7. Clean the sealing surface of the engine block.
Installation Procedure
1. Install the thermostat housing to the engine block.
2. Install the thermostat housing bolts.
Tighten: Tighten the bolts to 10 N.m (89 lb in).
3. Lubricate the inner diameter of the radiator hose with engine coolant.
4. Install the outlet hose to the thermostat housing. Secure the hose with the clamp.
5. Install the generator.
6. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
7. Inspect all sealing surfaces for leaks after starting the engine.
THERMOSTAT REPLACEMENT (5.3L ENGINE)
1. Drain Radiator and remove the radiator outlet hose.
2. Remove the water pump inlet bolts.
3. Remove the water pump inlet and thermostat from the water pump.
Installation Procedure
IMPORTANT: The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
1. Install the thermostat and thermostat housing to the water pump.
2. Install the thermostat housing bolts.15 N.m
3. Install the radiator outlet hose.
4. Fill the cooling system with specified coolant and concentration. Follow the correct cooling systen bleed procedure for your engine.
5. Inspect all sealing surfaces for leaks after starting the engine.

Hello, my name is Mario.

1. Disconnect battery negative cable.
2. Drain engine coolant
3. Remove bolt and nut for thermostat housing
4. Remove the old thermostat
5. Put a new thermostat and gasket (Install thermostat into cylinder head with jiggle pin positioned up.)
6. Place thermostat housing
7. Fill radiator with engine coolant
8. Connect battery negative cable
9. Start engine and check for leaks.

Good luck