Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

99 chevy malibu thermostat

  Email This Post

New User

Dec 19, 2008, 5:12 PM

Post #1 of 8 (16120 views)
     99 chevy malibu thermostat  

hello , im trying to change the thermostat on my 1999 chevolet malibu,3100 v6 code m engine with 65000 miles on it. I ve located the thermostat housing and found out there is not alot of room to work. My question is should I be able to remove the bolts in housing with a socket wrench or will I need to remove another part prior to get in at it.I know its a stupid question but I dont want start taking a whole lot of stuff apart just to fix a little ole thermostat.Instructions on how to do this would be great as its my only ride and I dont have a lot of money

(This post was edited by majorman on Dec 19, 2008, 6:26 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator

Dec 19, 2008, 5:32 PM

Post #2 of 8 (16098 views)
     Re: 99 chevy malibu thermostat [In reply to]  

At a glance this is fairly straight forward. Do remove whatevers in the path of getting to the two bolts that hold housing. Make sure you install in correct position and because this one is mounted on its side do what you must such that it doesn't fall out of place while fastening up housing.

Just curious: Why are you replacing it - for what symptoms?


3.1L Engine
  1. Disconnect the negative battery cable.
  2. Drain the cooling system, into a suitable container, to a level below the thermostat housing.
  3. Remove the air cleaner assembly.
  4. Remove thermostat housing-to-intake manifold attaching bolt and nut, then remove the housing.
Remove the two housing-to-intake manifold bolts and remove the housing
  1. Remove the thermostat.

To install:
  1. Clean all gasket surfaces completely.
  2. Insert the thermostat in the intake manifold.
  3. Attach the thermostat housing to the intake manifold.
  4. Install the mounting bolt and nut. Tighten to 18 ft. lbs. (25 Nm)
  5. Install the air cleaner assembly.
  6. Connect the surge tank line to thermostat housing.
  7. Refill the cooling system.
  8. Connect the negative battery cable, remove the radiator cap, then start the engine. Allow the engine to run with radiator cap removed, until the upper radiator hose becomes hot (thermostat open). With the engine idling, add coolant to the radiator until the level is up to the bottom of the filler neck.
  9. Install the radiator cap, making sure the arrows line up with the overflow tube.

Long retired now

New User

Dec 19, 2008, 6:19 PM

Post #3 of 8 (16094 views)
     Re: 99 chevy malibu thermostat [In reply to]  

Smilethanks I really appreiate this. The reason I'm changing the thermostat is it just started running hot and Im not getting any heat so I figured I would do this first and see if that fixed it. I think its running to good to be anything esle but than again Im not really a mechanic. thanks for your help

(This post was edited by majorman on Dec 19, 2008, 6:25 PM)

Tom Greenleaf
Ultimate Carjunky / Moderator

Dec 19, 2008, 6:37 PM

Post #4 of 8 (16084 views)
     Re: 99 chevy malibu thermostat [In reply to]  

Running hot and not getting heat:

That's why I asked - it's not the thermostat IMO! Boiling coolant/ or just water won't throw heat!

First you need to verify coolant level is full. If this is a first cold snap for you then I have to ask if the anti-freeze concentration is adequate? 50/50 mix is the common requested strength. 99 cent ball testers work fairly well and close enough for most.

This may not use a cap on the radiator itself which makes knowing it's full a pill. Gotta squeeze upper hose and look for bubbles at the recovery tank is one clue rad is truely full - when cold/cool and no pressure evident.

Hit back if you can't figure it out,

Long retired now

Anonymous Poster

Dec 20, 2008, 5:09 PM

Post #5 of 8 (16068 views)
     Re: 99 chevy malibu thermostat [In reply to]  

  thanks for your help I used your thermostat change out wiith the diagram and it worked out perfect thanks again ur my hero]

Veteran / Moderator

Dec 20, 2008, 5:49 PM

Post #6 of 8 (16058 views)
     Re: 99 chevy malibu thermostat [In reply to]  

Way to go Tom!!!!!!!!!!

Being way2old is why I need help from younger minds

New User

Jul 21, 2011, 3:39 PM

Post #7 of 8 (9215 views)
     Re: 99 chevy malibu thermostat [In reply to]  

Same car same engine, but I can't get the thermostat housing to open enough to get the thermostat out because it hits the manifold. ANY HELP PLEASE

Hammer Time
Ultimate Carjunky / Moderator

Jul 21, 2011, 3:52 PM

Post #8 of 8 (9213 views)
     Re: 99 chevy malibu thermostat [In reply to]  

This thread is nearly 3 years old. Please start a new one if you have a question.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

99 chevy malibu thermostat

  Email This Post

Latest Forum Post
Hi, I love my car but have a problem that I've been unable to fix and would lov...
Hello all. I am going to take my car into the shop to see if they can help me di...
Actually my car is a boat.77 Carver with ford 351 w. My question concerns the wi...
had problem with break light staying on. tapped the switch on the master cylinde...
 2008 ford escape automatic dimming rearview mirror not working hi guys thi...
2008 Nissan Sentra 2.0 CVT 50,000 Miles New to DIY auto repair. I want to repla...

Feed Button

Used Car Search
Used Car Price Ranges:
Under $5,000

Over $45,000
Search used Cars By Manufacturers:
Used Acura
Used Audi
Used BMW
Used Buick
Used Cadillac
Used Chevrolet
Used Chrysler
Used Dodge
Used Ford
Used GMC

Used Honda
Used Hyundai
Used Infiniti
Used Jaguar
Used Jeep
Used Kia
Used Land Rover
Used Lexus
Used Lincoln
Used Mazda
Used Mercedes-Benz

Used Mitsubishi
Used Nissan
Used Porsche
Used Saab
Used Scion
Used Subaru
Used Suzuki
Used Toyota
Used Volkswagon
Used Volvo
2010 Honda Civic
2004 Jeep
2012 Mustang
1997 Honda Cr-V
2010 Toyota Prius
2010 BMW 328

Automotive Forum Categories
Automotive Repair
Auto Body Repair and Refinishing
AC Auto Repair Help Forum
Automotive Wiring and Electrical

Auto Insurance and Car Financing
Automotive World
Brake Systems
Car Stereo Repair Advice
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair

Steering and Suspension
Tricks of the Trade
General Discussions
Car Shows and Events
The Bargin Bin
Motor Vehicle Inspection
Car Care Tips
Traffic Ticket Help
Car Racing

Gasoline, Motor Oils, Concept Cars
Remote Control Cars and Vehicles
Truck Repair
Truck Repair Advice

Truck Engine Repair
Truck Suspension Repair
Motorcycle Repair
Motorcycle and ATV Repairs

Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Seat Repair
Car Forum Posts - Sitemap

Search for (options) Privacy