GM 3100,3400 Thermostat Replacement




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shelton williams: Olds cutlass supreme 1996 with 3.1

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.

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

shelton williams: I tried to tackle this on an Oldsmobile last night and the housing would NOT come off and fit in between the old thermostat and manifold, I had to leave old one on.. Mine didn't so easily come out, my air cleaner was flat instead of upright, it's a 96 olds rich, do I have to take off throttle body? I'm stumped

M & J: 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!!

jim mcdowell: I had to replace my thermostat today. I followed your advice except I removed the throttle body and the coolant pipe. The bottom bolt was still tough. I used a shorty wrench with a screw driver to hold it in place. It worked. Thanks for the video.

Alberto Barragan: You dont have to take the bottom bolt out. Just get it loose. The thermostat housing has an oppening for that bottom bolt.

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.

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

Cj Hyde: Cal Van 751 GM Thermostat Wrench - is the specialty wrench needed to replace your thermostat w/o taking off all the parts (just in case you didn't see the rest of my last comment...

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.

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?

wederingas: Thanks Rich, my wife just bought an '05 Buick Rendezvous with a 3400 engine and she does all the work herself, and the thermostat needs changing

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.

Phish N' Chimps: 2:34... this is why you need an assistant... maybe a small structured person... would be interesting to see a midget as a mechanic. strong as heck, doesn't need a high lift. 

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.

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

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

Alex W: that bottom bolt bested me for 3 hours, even after loosening the exaust shroud. ended up losing the bolt in the belly of the engine bay. gotta go to lowes and try again :(

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.

Jeffrey Coogan: Thanks so much. I managed to change my thermostat about 8 years ago. Now I need to do it again and I couldn't remember how I did it the first time! They really put it in an inaccessible place. Thanks for the refresher!

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

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

aislesoffiles: Is there any other way to get to the bottom bolt? Watched your video, and got the wrenches you mentioned, but still can't get to the bottom bolt.

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?

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 

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)

314mrjohnson: hey do you have any videos on changing the O2 sensor and also were there all located

Gabriel Palma: thank you rich for the info

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

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. 

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..

Michael Felker: Ok. My fans haven't been kicking on on my 3.1L lumina. I've changed relays and the thermostat. Do you have any advice on what to try next? I have also checked all the fuses too. Any help would be massively appreciated

audreonna619: On average how long does it take for a mechanic to replace the thermostat on a 2002 Buick Rendezvous?

Newcumpas1: Thanks for the help on this project, I found that I just took the air cleaner tube and the throttle body off and I could get to the bolts. The top one needs to come out, but the bottom one does not. You can just loosen the bottom bolt and the housing will slip off of it. Take Care

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

tanya bolton: Nice video, I like the idea to use a superstat that in future if it fails it stays open all the time, avoiding overheating. No gasket seal people, make sure there is a new gasket that comes with the thermostat. Learn from the best, shop foreman in shop class said to fire your mechanic if he tells you to use gasket sealer.

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

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
Rating:
GM 3100,3400 Thermostat Replacement 4.5 out of 5

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GM 3100,3400 Thermostat Replacement