How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask John Your Own Question

John
John, Buick Master Technician
Category: Buick
Satisfied Customers: 9176
Experience:  ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
6408229
Type Your Buick Question Here...
John is online now
A new question is answered every 9 seconds

I need to replace the thermostat on my 1995 Buick Century wagon

Resolved Question:

I need to replace the thermostat on my 1995 Buick Century wagon 3.1L V6. It looks like I'll have to remove the throttle body to do so. Is there a way to avoid this?
Submitted: 4 years ago.
Category: Buick
Expert:  John replied 4 years ago.

Hello & Welcome to JA,

 

here is information to help you.

 

Thermostat

REMOVAL & INSTALLATION

 

See Figures 1, 2, 3 and 4

  1. Disconnect the negative battery cable.
  2. Drain the cooling system.



CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Some models require you to remove the air cleaner assembly from the throttle body.
  2. Some models with cruise control have a vacuum modulator attached to the thermostat housing with a bracket. It your vehicle is equipped as such, remove the bracket from the housing.
  3. On the 4-cylinder engines, unbolt the water outlet from the thermostat housing, remove the outlet from the housing and lift the thermostat out of the housing. On all other models, unbolt the water outlet from the intake manifold, remove the outlet and lift the thermostat out of the manifold.




Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Fig. Fig. 1: Loosen the clamp securing the hose to the thermostat housing



Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Fig. Fig. 2: Remove the bolts securing the housing, then pull it away



Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Fig. Fig. 3: Make a note as to which end of the thermostat fits in the housing

To install:

  1. Clean both of the mating surfaces and run a 1 / 8 in. (3mm) bead of R.T.V. (Room Temperature Vulcanizing) sealer in the groove of the water outlet.




Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Fig. Fig. 4: Make sure both of the mating surfaces are free of any old gasket material

  1. Install the thermostat (spring towards engine) and bolt the water outlet into place while the R.T.V. sealer is still wet. Tighten the bolts 17-21 ft. lbs. (23-28 Nm) on all but the 2.2L engine. Other engines tighten to 89 inch lbs. (10 Nm).
  2. The remainder of the installation is the reverse of removal. Fill the cooling system, start the engine and top off. Check for leaks after the car is started and correct as required.

 

Customer: replied 4 years ago.
This is the exact information that I found free of charge on Autozone.com before I contacted JA. Clearly the thermostat is obscured by the throttle body, yet I have not been able to find instructions regarding thermostat replacement for this specific instance. I'm willing to pay the $23 for information that I can't find on my own that answers my question adequatly.
Expert:  John replied 4 years ago.

Engine Coolant Thermostat Replacement (3100 Engine)

 

The throttle body can be worked around ,but if it is in your wat remove it.

Tools Required

Hose Clamp Pliers

  1. Partially drain the cooling system. Carefully remove the throttle body air inlet duct.

    Attachments are only available to registered users.

    Register Here


    reposition the hose clamp at the thermostat housing.
  2. Disconnect the radiator hose from the thermostat housing.

    Attachments are only available to registered users.

    Register Here


  3. Remove the thermostat housing bolts.
  4. Remove the thermostat housing and gasket.

    Attachments are only available to registered users.

    Register Here


  5. Remove the thermostat.
  6. Clean the mating surfaces.

    Attachments are only available to registered users.

    Register Here


  1. Install the thermostat.

    Attachments are only available to registered users.

    Register Here


  2. Install the thermostat housing and the gasket to the intake manifold.

    Attachments are only available to registered users.

    Register Here


    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  3. Install the thermostat housing bolts with RTV sealer GM P/N(NNN) NNN-NNNNor the equivalent.

    Tighten
    Tighten the thermostat housing bolts to 25 N·m (18 lb ft).

  4. Connect the radiator hose to the thermostat housing.
  5. reposition and install the hose clamp at the thermostat housing.
  6. Carefully install the throttle body air inlet duct.
  7. Fill the cooling system. Inspect the system for leaks.
Customer: replied 4 years ago.
Are you able to point me to instructions for removing the throttle body?
Expert:  John replied 4 years ago.

Sure ,

 

 

 

Throttle Body Assembly Replacement


    Attachments are only available to registered users.

    Register Here


  1. Drain coolant. Remove the air intake tube.

    Attachments are only available to registered users.

    Register Here


  2. Disconnect the IAC valve electrical connector.

    Attachments are only available to registered users.

    Register Here


  3. Disconnect the TP sensor electrical connector.


  4. Disconnect the accelerator controls cable.

    Attachments are only available to registered users.

    Register Here


  5. Remove the accelerator control cable bracket.

    Attachments are only available to registered users.

    Register Here


  6. Disconnect the throttle body coolant bypass hoses.
  7. Disconnect the heater pipe nut at the throttle body.
  8. Remove the nuts and bolts holding the throttle body to the intake manifold.
  9. Remove the throttle body assembly.

Notice: Do not use solvent of any type when cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as damage to the gasket surfaces and throttle body assembly may result.

Use care in cleaning the gasket surfaces on the intake manifold and the throttle body assembly, as sharp tools may damage the gasket surfaces.

 

 


    Attachments are only available to registered users.

    Register Here


  1. Clean the gasket surface on the intake manifold and the throttle body assembly.
  2. Reinstall a new gasket, if necessary.
  3. Reinstall the throttle body assembly.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Reinstall the throttle body retaining nuts and bolts (3).

    Tighten
    Tighten the throttle body retaining nuts and bolts to 28 N·m (21 lb ft).

  5. Connect the throttle body coolant bypass hoses.
  6. Connect the heater pipe nut at the throttle body.

    Attachments are only available to registered users.

    Register Here


  7. Connect the IAC valve electrical connector.

    Attachments are only available to registered users.

    Register Here


  8. Connect the TP sensor electrical connector.

    Attachments are only available to registered users.

    Register Here


  9. Reinstall the accelerator controls cable bracket.

  10. Connect the accelerator controls cable.

    Attachments are only available to registered users.

    Register Here


  11. Reinstall the air intake tube.
  12. Refill the coolant.

    Important: The throttle should operate freely without binding between full closed and wide open throttle.

  13. Inspect and check for complete throttle opening and closing positions by operating the accelerator pedal. Also check for poor carpet fit under the accelerator pedal.
John, Buick Master Technician
Category: Buick
Satisfied Customers: 9176
Experience: ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
John and 5 other Buick Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Buick Technician

    Satisfied Customers:

    1718
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Buick Technician

    Satisfied Customers:

    1257
    15 years Buick Technician experience and training.
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Buick Technician

    Satisfied Customers:

    768
    15 years master GM tech and mater ASE tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Buick Master Technician

    Satisfied Customers:

    731
    ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    411
    ASE Master 15+years
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Buick Mechanic

    Satisfied Customers:

    393
    GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
  • http://ww2.justanswer.com/uploads/Rocket2005/2009-09-13_133703_jack.jpg cartech's Avatar

    cartech

    ASE Certified Technician

    Satisfied Customers:

    307
    master tech automotive shop owner and tech 25 years
 
 
 
Chat Now With A Buick Mechanic
John
John
MASTER AUTOMOTIVE TECHNICIAN
731 Satisfied Customers
ASE A1-A8 w/L1 GM master technician.Factory certified with 40 years experience.