GM 3100,3400 Thermostat Replacement




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Did this video help you?

Mike B: +rich pin hey rich for the bottom bolt, does a socket extension not fit? Might have to do this on my gf Aztek. Thanks Great video by the way.

MJ-1: the gasket ALWAYS BREAKS!! So everyone make sure you buy a new gasket before opening your theroaldo body, (Oh however you spell it) your termo!! is only 5bucks, & intake cleaner!!

sranjesuper: i'm a mechanic i just did this job 2 days ago on a 3.4 montana, i removed the throttle body and was able to access both bolts with a small 13 mm wrench

Phil Merrow: Thank you for this video. I used it to replace the thermostat on my daghter's Lumina. It was 100% on. That lower bolt is a pain in the rear end. Thanks again.

rustydog0329: If GM can save 15 seconds. and 3 inches of hose when they build a car, they will do it, even if once you own it, it will take you 6 hours to replace a part that DOES require periodic replacement

Proper Image Performance: Rich Pin, that was a very informative video, now on to all the non mechanics with "friends that are mechanics" you do not need any gasket sealer for this job because that piece of rubber that goes around the thermostat is recessed in the intake and it protrudes out just enough for it to seal against the thermostat housing. Tell your half ass mechanic friend that if he does a couple he would not have your dumb ass believing what he told you was the truth... thanks again Rich Pin.

Allen Christo: Yes, she sure will. She's worth it. In the Spring I'll get that one rust spot. She'll look like new. 8o)

Tito Diaz: have a problem with both screws but the bottom one is really hard i have fat fingers and i cant reach the bottom bolt the black and silver pipes and the other thing are really in the way any suggestions on a tool to use or something 

Terry LaMasters: Thank you for your video. My friend is a mechanic and he told me how to change the thermostat. After looking in the engine compartment, I realized that I was intimidated. After watching your video it helped me to understand I can do it and how easy it was...except for the bottom bolt. Thanks again for your video since I am a Buick Rendezvous owner.

Gene Reeves: Thanks for the very informative video-helped a lot.!!!!!!!!

csx3309: Hi just wondering if you have to take the bottom bolt completely out seeing that the thermostat housing is slotted on the bottom bolt ? you would think with that design you could just loosen it enough to remove the housing? thanks

Eric Brooks: How did you remove the top bolt without removing any of the surrounding parts?

Sid DeBord: to bad you didn't mention the sealer/gasket glue. if you don't do this, all the trouble you go to with that bottom bolt is pointless cause you'll have to do it all over again. my buddy told me "if you knew about working on cars, you would've known that", if i knew about working on cars, i wouldn't be watching this half assed video would i. thanks for wasting my time richpin

Michael Faith: Great video! I can't thank you enough! I have an '02 Alero 3.4L so it was a little different. Not an easy job but MUCH easier after watching you. The guy at Autozone said the instructions he had in his computer system said that you need to take the exhaust manifold off. I can see how that would make it easier but after looking at those bolts, I didn't want to take the chance of breaking half of them off. My son is taking his driver's test this Friday and they won't let you take the test with the "Service Engine Soon" light on. Thanks to your help the light is off and we're good to go!

Betsy Willey: Your video was very helpful thank you, the only thing I would change is to mention about he sealer/gasket glue.

Jon Bell: that bottom bolt is so hard...i do not understand why he doesnt take off the crossover pipe. if you bump that thermostat and it comes out of place your screwed...if possiablejust take off the exhaust crossover pipe

Gabriel Palma: thank you rich for the info

t72w3qz: As the thermostat housing is slotted for the bottom bolt could you possibly pull the bolt most of the way out, leaving it in place with a few threads, and still remove and replace the housing with enough room for the housing to clear the thermostat?

4Mary6: I also wish to join the chorus of thanks. This video was just the information I needed. I didn't have the curved wrench that you have. After looking around the internet I found a specialty wrench on eBay called a Cal Van 751 GM Thermostat Wrench. It is a U shaped wrench that fits under the exhaust manifold to get that lower bolt. I had to place a piece of wood on top of the transmission block to hold this wrench in position. I also had to use a 8" cheater pipe to get enough leverage to finally get the lower bolt to loosen up. After that, it was just as you showed. Thanks again!

GUALLACOL: Excellent video, thanks!

Chris Oursler: very helpful thank you

Allen Christo: Ok, here's the final update on my cars problem. It turns out that it's the intake manifold gaskets that is what needs to be fixed. It's a lot worse then just the thermostat but, not nearly as bad as the Head gaskets. Needless to say, not bad enough to get rid of my car. I do love this 95 Buick and she will live on.

Allen Christo: Hey Rich, my Buick Century just started losing coolant all of a sudden. I was trying to figure out why. I thought changing the thermostat would be the easiest fix here. Now I am second guessing myself. I don't want to do this now if it's not the problem. Other then the thermostat I was thinking maybe the Water Pump. If not that then the worst case the Head Gasket. What do you think I should do first to figure out my coolant loss? If I have a bad Thermostat will my check engine light come on?

dailydriver: The top bolt is very easy once it is loosened. A quarter inch socket and extension will get it out. The back bolt was frozen. I used a combo wrench open end on the bolt and a nylon strap with s hook on the box end. This gave me enough torque to free it up. Then I had to flip the opened end 12 time for each turn. I shortened the back bolt a eighth inch or so since it protrudes out the casting any how. Screwed in two turns and was able to grind off some extra lip of the gooseneck to get it over the thermostat. Then I was able to tighten the back bolt 3/4ths of the way in with a ratcheting box wrench and finish off with the end wrench. 

0nly1champ: how did you remove the duct hose? I remove the 2 wires from the hose and loosened the clamps but I couldn't remove the plastic piece on nor could I get the duct loose after loosening the clamps

kingrider75: I agree with sonal. I couldn't get my big paws anywhere near that bottom bolt. I don't think I haver worked on an engine that is such a PITA. 

trainboy20072009: the information was very helpful, it took me a while to get it together but in the long run it was well worth it. some people need to understand like a few in this list that what works for 1 person doesn't always mean its gonna work the same for them. and speak of wasting time, Sid DeBord comment is a waste of time, have a little respect for a guy who is trying to help others. thanks again richpin06a..

Selfish bastard: Changed this thermostat along with lower intake manifold gasket, then it over heated again due to external radiator fluid leak. Now it is running too cold.. Do I have to do lower intake manifold gasket job again? Or Am I good just replacing the thermostat again?

ATXs Navbuoy: I normally take my time - the exhaust is in the way but the bolts look rough and I didn't want to touch them. So I took off the hose off the fuel rail and removed the sensor above it from the throttle body giving my enough room to get my wrench in and loosen that infernal second bolt. Great Vid by the way - thanks for posting!

richpin06a: Are you getting hot air out the vents....if not the place to start is to check the heater hoses were they go through the firewall.Both should be hot when the car is up to temperature.

John Doe: Does it matter what position the thermostat sits vertically or horizontally in the housing? Mine had quit a bit of play when I finally got the housing removed and I'm not sure how it was originally seat in there or if it matters. Awesome video by the way. That bottom bolt is a pain.

richpin06a: 7mm on that bolt.

pitchshifter78: Would this be the same for my 95 Cutlass supreme 3.1?

Ernie S: I did everything as you showed, except used a ratcheting wrench on the bottom bolt. It worked well. The whole job from opening the hood to finish around 35 minutes.

meTimetraveler: lol

richpin06a: I had to use a 13mm carburetor wrench.

KmAlbum: thanks lots. I'm just glad I won't have to take off the X-over exhaust pipe. That'll be a pain in the butt. Especially those exhaust bolts gets rusty really bad over time.

richpin06a: That curved vw wrench was used for the tough to get at 13mm nuts that held on the carburetor.

Butch Belanger: Rich, Thanks for the reply. Unfortunately the thermostat didn't stay in place. With that said, is it still possible to remove the housing without taking the motor mount off? What are my other options? Thanks, -tom-

richpin06a: If it has a jiggle valve that goes up but the ones i replaced did not.Did you compare the new to the old one to make sure it was the right one before installing.

Jeremy Oros: good video.. i was frustrated with that bottom bolt.. now I know how to get on it, thanks!

richpin06a: Now i know to stay away from the Aztek.

Asstmgrmike: actually it turns out (it was very dark) its actually the hose from the pcv valve into then intake. it was snapped in half. do you think thats what is causing it not to idle? i know some fords are built that way but i didnt know if GM's were

Rok Myong: 01 Venture 3.4l is terrible , there is no room for housing to come out most guy will spend 2 hours easy good luck you guys! what a bad design! no wonder Chevy go broke!

Thrishmal: Thank you for the reply, will have to look into that.

richpin06a: I do not know what to say other than make sure the thermostat stays in place while you are removing the water outlet.

Kiddro22: Yeah I noticed that also. Now I have better confidence in doing the job now. Just completely loosen and take out the top bolt but just loosen the bottom one till u can slide the housing out. Sweet!

OSIRIS531303: I am so dreading this task. I have a 95 lumina v6 3.1 . Not looking forward to it at all. Glad the part is only gonna run me 10 bucks.

jeff darnell: i could not agree more, i watched this vid about 3 months ago trying to do the thermostat. it got done, if i remember correctly it took like 3 hours. i eventually just took stuff off till i could get to it. Now im watching videos again trying to find a way to access o2 sensor. which of course is just out of reach and blocked by about 5 different things.

leem: I let car idle for 30 min drove it for 10 min, got gas and then it started slowly overheating. So it does not overheat right away. It was doing thiis this the last 2 weeks but after a while the temp would go down(thsrmostat opening maybe?) . But the temp started getting higher each day before it sould go back down. And now when it goes up it does not come back down. Also both fans are running.
Rating:
GM 3100,3400 Thermostat Replacement 4.6 out of 5

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GM 3100,3400 Thermostat Replacement