Question about 1990 Oldsmobile Silhouette

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Leaking coolant from pipe behind throttle body..

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Look for a loose water or coolant hose .
Re tighten it and you will be OK .
If the problem is that it leaks the engine gasket then you may need to reinstall new gasket but this involves a lot of work.
A good light and a good mirror is what you need to see better where the leak is coming from .

Posted on Dec 11, 2009

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This is one of 2 pipes that circulate water to your heater core. On a vehicle that age it isn't uncommon for them to be corroded and start leaking. They will continue to leak and only get worse. It needs to be replaced. Replacing them usually isn't too difficult unless they are routed around/under or through things. Good luck!

Posted on Dec 12, 2009

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1 Answer

Thermostat on a saab


4 Cylinder Thermostat Removal


1. Drain the coolant by opening the drain cock or removing the lower radiator hose. Remove the lid to speed up process

2. Remove the throttle body cover on turbo cars

3. Remove the bypass hose and the pressure pipe between the Intercooler and the throttle body on turbo cars

4. Rempve the screw that holds the coolant pipe to the water pump

5. Remove the screw that holds the coolant pipe in the front left of the engine

6. Remove the hose to the throttle body pre-heater

7. Remove the thermostat housing and remove the thermostat

8. Refit in Reverse

Feb 07, 2014 | 1997 Saab 900

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Where is the thermostat located on saab900 se


4 Cylinder Thermostat Removal


1. Drain the coolant by opening the drain cock or removing the lower radiator hose. Remove the lid to speed up process

2. Remove the throttle body ccover on turbo cars

3. Remove the bypass hose and the pressure pipe between the Intercooler and the throttle body on turbo cars

4. Rempve the screw that holds the coolant pipe to the water pump

5. Remove the screw that holds the coolant pipe in the front left of the engine

6. Remove the hose to the throttle body pre-heater

7. Remove the thermostat housing and remove the thermostat

8. Refit in Reverse

Feb 07, 2014 | 1997 Saab 900

2 Answers

Antifreeze getting into throttle body


The 3.8 liter for this year has a plastic intake manifold. These manifolds are known to fail around the EGR port. When this happens coolant will leak into the intake right behind the throttle body. Dorman makes a replacement upper plenum that has been reinforced in this problem as along with a new gasket and an updated EGR tube. This will more than likely solve your issue. If you see a little coolant behind the throttle body this repair needs to be done ASAP. If this area completely ruptures it will hydroloc the engine. This means that coolant will fill one or more of the cylinders and the engine will not turn over/start.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Nov 03, 2012 | 1998 Oldsmobile 88

1 Answer

Fixing a coolant leak under the throttle body


The throttle body is heated, replace the hose that supplies it hot coolant

Feb 22, 2012 | 1990 Chevrolet Cavalier

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

How do i replace the water thmostat 99 6 cylider


WELL YOU NEED TO DRAIN COOLANT LEVEL BELOW THERMOSTAT LEVEL.YOU HAVE TO DISCONNECT MAF SENSOR LOOSEN AIRDUCT 2 LARGE CLAMPS LOOSEN REMOVE 4 SCREWS TO AIR FILTER COVER LIFT UP REMOVE COVER. THEN REMOVE AIR FILTER AND HOUSING, FIRST DISCONNECT MAF SENSOR.YOU HAVE TO DISCONNECT THROTTLE CABLE AND SHIFT CABLE.YOU HAVE TO DISCONNECT REMOVE THROTTLE BODY COOLANT HOSES DISCONNECT IDLE SPEED CONTROL VALVE CONNECTOR AND DISCONNECT TPS SENSOR CONNECTOR. THEN REMOVE THROTTLE BODY ASSEMBLY. YOU NEED TO BUY NEW THROTTLE BODY COOLANT HOSES AND NEW THROTTLE BODY GASKET FOLLOW TOP COOLANT HOSE TO ENGINE BLOCK.NOW YOU SEE CAN AND REMOVE THE THERMOSTAT HOUSING REPLACE THE THERMOSTAT.BESURE TO HAVE EXTRA COOLANT ON HAND.BLEED COOLANT SYSTEM WHEN DONE.TO BLEED COOLANT SYSTEM REMOVE RADIATOR CAP ON OVERFLOW JUG.THEN OPEN BLEED SCREW ON THE WATER PUMP BYPASS HOSE PIPE JUST A LITTLE.POUR COOLANT IN THE OVERFLOW JUG UNTIL LEVEL STOP DROPPING.STOP AT COLD MARK ON JUG.CLOSE BLEEDER SCREW ON WATER PUMP BYPASS HOSE PIPE.CRANK VECHICLE CHECK FOR LEAKS. START UP ENGINE LET IDLE FEW MINUTES THEN CHECK COOLANT LEVEL ADD MORE UNTIL UNTIL LEVEL STOP DROPPING.PUT RADIATOR CAP BACK ON OVERFLOW RESERVOIR. LET ENGINE IDLE WATCH COOLANT TEMPERATURE GAUGE.WHEN GAUGE START CLIMBING. TURN OFF ENGINE WAIT FEW MINUTES TAKE A LARGE RAG OPEN RADIATOR JUST A LITTLE YOU HEAR HISS NOISE.WHEN PRESSURE STABILIZE DONT GET SCALDED BECAREFUL.OPEN CAP LITTLE MORE.IF COOLANT PRESSURE STILL BOILS OUT WAIT 20 MINUTES ADD MORE COOLANT TO RADIATOR OVER FLOW WHEN COOLANT LEVEL STOP DROPPING.PUT RADIATOR CAP BACK ON START VECHICLE UP LET IDLE UNTIL THERMOSTAT OPEN. THEN FEEL TOP RADIATOR HOSE FEELS HOT THERMOSTAT OPEN WATCH TEMPERATURE GAUGE.IF GAUGE TEMP START CLIMBING TURN OFF ENGINE WAIT A WHILE.CHECK AND ADD MORE COOLANT.WHEN THE ENGINE CAN IDLE TEMP GAUGE STOP CLIMBING YOU HAVE BLEED COOLANT SYSTEM.KEEP CHECK ON COOLANT LEVEL.

Dec 29, 2010 | 1999 Oldsmobile Alero

1 Answer

Thermostat replacement 2002 rendezvous


Thermostat Removal & Installation 3.4L & 3.5L Engine To Remove:
  1. Drain the coolant below the level of the thermostat.
  2. Remove the air cleaner and duct assembly.
  3. Remove the exhaust crossover pipe.
  4. Disconnect the radiator hose from the thermostat housing. gm_mv_ven_tstat.gif

  5. Remove the mounting bolts and remove the thermostat housing.
  6. Remove the housing gasket.
  7. Remove the thermostat.
  8. Clean the mating surfaces.
To Install:
  1. Install the thermostat on the engine. NOTE: Apply RTV sealer to the thermostat housing bolt threads.
  2. Install the thermostat housing and gasket with the mounting bolts. Tighten 18 ft-lb (25 Nm).
  3. Connect the radiator hose to the thermostat housing.
  4. Install the exhaust crossover pipe.
  5. Install the air cleaner and duct assembly.
  6. Fill the cooling system.
  7. Check the cooling system for leaks.
3.6L Engine To Remove:
  1. Remove the air cleaner.
  2. Remove the throttle body.
  3. Remove the heater pipes.
  4. Remove the coolant inlet pipe. Thermostat 3.6L gm-03-36-2447.gif

  5. Remove the thermostat mounting bolts and remove the thermostat.
  6. Clean the thermostat and heater pipe mating surfaces.
To Install:
  1. Place the thermostat in the housing with a new gasket.
  2. Install the thermostat and gasket on the engine with the mounting bolts. Tighten 89 in-lb (10 Nm).
  3. Install the coolant inlet pipe.
  4. Install the heater pipes.
  5. Install the throttle body.
  6. Install the air cleaner.
  7. Fill the cooling system and perform a leak test.
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Dec 19, 2010 | 2002 Buick Rendezvous

1 Answer

What do i do when its over heating? how do i install thermostat?


Thermostat Removal & Installation 3.4L & 3.5L Engine To Remove:
  1. Drain the coolant below the level of the thermostat.
  2. Remove the air cleaner and duct assembly.
  3. Remove the exhaust crossover pipe.
  4. Disconnect the radiator hose from the thermostat housing. gm_mv_ven_tstat.gif

  5. Remove the mounting bolts and remove the thermostat housing.
  6. Remove the housing gasket.
  7. Remove the thermostat.
  8. Clean the mating surfaces.
To Install:
  1. Install the thermostat on the engine. NOTE: Apply RTV sealer to the thermostat housing bolt threads.
  2. Install the thermostat housing and gasket with the mounting bolts. Tighten 18 ft-lb (25 Nm).
  3. Connect the radiator hose to the thermostat housing.
  4. Install the exhaust crossover pipe.
  5. Install the air cleaner and duct assembly.
  6. Fill the cooling system.
  7. Check the cooling system for leaks.
3.6L Engine To Remove:
  1. Remove the air cleaner.
  2. Remove the throttle body.
  3. Remove the heater pipes.
  4. Remove the coolant inlet pipe. Thermostat 3.6L gm-03-36-2447.gif

  5. Remove the thermostat mounting bolts and remove the thermostat.
  6. Clean the thermostat and heater pipe mating surfaces.
To Install:
  1. Place the thermostat in the housing with a new gasket.
  2. Install the thermostat and gasket on the engine with the mounting bolts. Tighten 89 in-lb (10 Nm).
  3. Install the coolant inlet pipe.
  4. Install the heater pipes.
  5. Install the throttle body.
  6. Install the air cleaner.
  7. Fill the cooling system and perform a leak test.
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Sep 18, 2010 | 2002 Pontiac Aztek

1 Answer

2004 GMC Sierra 5.3L engine. Using excessive coolant; no external leaks. Passed compression test. Intake gaskets replaced. Residue found inside the intake and heads from burnt coolant. Suspect it may be a...


I was going to say water pump but no block the water inlet to throttle body and let run a while can you smell a sweet smell or steam comming from your tail pipe Next is a die test you can do . Put the die in your rad and go for a 5 mile ride now use a cheep black lite $3.00 at lowes the leak will show up. good luck CJ

May 12, 2010 | 2000 GMC Sierra

2 Answers

How can i get to the thermostat housing on my 1999 Buick Century


drain the coolant
remove the 2 connectors on the air duct
remove the air inlet duct from the throttle body to the air box
disconnect the throttle cable and cruise control cable
remove the throttle cable bracket one 10mm nut at the bottom of the throttle body and 2-10mm bolts on top of the throttle body
MOVE A SIDE YOU DO NOT HAVE TO REMOVE THE CABLES FROM THE BRACKET
ok there is a coolant pipe runs across the front valve cover
remove the the hose that will go under the upper intake
then remove the 8mm bolt holding the coolant pipe
then back at the throttle body there are 2 small hoses side the clamps up the you will see a brace on the coolant pipe bolts to the throttle body with a 13mm nut remove that nut
ok now the 2 small hoses will be stuck to the pipe use a SLIDE A SMALL SCREW DRIVER BETWEEN THE HOSES AND THE COOLANT PIPE BE CAREFULL NOT TO CUT THE HOSE
now lift the coolant pipe up at the front of the engine IT HASE AN O RING SEAL
then slide the coolant pipe back at the throttle body back to remove the hoses from the coolant pipe
remove the TPS,IAC and EVAP connectors
then remove the 2 thottle body bolts 13mm
remove the throttle body
you may have to TAP THE THROTTLE BODY WITH A SCREW DRIVE HANDLE TO RELEASE
check the gasket make sure it didn't TEAR or REPLACE IT
now remove the hose to the thermostat housing
there are 2 -13mm bolts the top bolt take it out
the bottom bolt remove 90% the bottom bolt hole is slotted
remove the thermostat housing
REV. porcedure to reassemble
then after you have reassembled
OPEN BOTH BLEED SCREWS THEY ARE 7mm BOLTS one on the thermostat housing and the other one is on the coolant pipe
fill the cooling system till you have a STREAM OF COOLANT COMING OUT OF THE BLEEDERS now CLOSE THE BLEEDER SCREWS
top up coolant in rad and install the cap top up the over flow bottle
start the vehicle up and select VENT,HIGH HEAT BLOWER TO HIGH
let vehicle run untill you have GOOD HEAT COMING OUT OF THE VENTS HOT! NOT JUST WARM
this will insure you have no air locks in the cooling system
good luck and i hope this was helpfull


Dec 19, 2009 | 2001 Buick Century

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