GM 3100,3400 Thermostat Replacement




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shelton williams: Olds cutlass supreme 1996 with 3.1

Robert Jones: Rich I'm about to replace my thermostat on my 2002 oldsmobile silouhette. Please give me a very easy tip on how to remove the bottom bolt I believe its 13 socket, my hands are to big and I can't get to it. Can you please help, and thank you Rich. 

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

Joyce Joyce: I know its like 4 years old but y did you remove lower bolt? should only loosen it as the housing will come out once top bolt is removed and lower is loosened...

Minermike12 Minermike12: Question...can this car run without a thermostat?

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.

Kenny Justice: thank you so much for the video really saved me a lot of headache

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.

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.

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...

Newcumpas1: There is a special wrench for this that is not to expensive, it makes the job so much easier. Also, the bottom bolt does not need to come out all the way, there is a notch in the housing that slips over it for easy removal and instillation.

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

Nikola Rogen: Glad i watched this, i started working on a friends 3.4 and ran out of daylight. I was worried i might have to take the coolant pipe out but i might be able to get in there if i move the airbox... Haha "all i removed was the intake tube". Also great idea putting the rag in there to catch bolts, i will start at it in the morning again

JambzModz: hard or nah

ada kittell: Do u have to drain coolant to change?

Jay Skony: I'm Tryin To Replace My Thermostat To Loosing The Bottom Bolt Do You Turn It Up Or Down PLEASE HELP!!!! NE1 

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

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

ada kittell: Do u have to drain coolant to change?

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 :(

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: 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!!

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

MiklaDfar: FYI... I did not take off the throttle body. I got to the bottom bolt off the tstat housing by taking the one nut off on the throttle body that holds the coolant pipe that runs above the heat shield and below the throttle body. I then removed the one hose that attached to this small coolant pipe. Then I was able to get a 12pt box end wrench on the bolt (the coolant pipe moved just enough). I used another box end wrench on the end of the first one to get some leverage to loosen the bolt. Though I could get to it from the bottom as shown in the video, I could not get enough leverage to loosen it.

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. 

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!

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.

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 

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

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

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

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)

Gabriel Palma: thank you rich for the info

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

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.

GUALLACOL: Excellent video, thanks!

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.

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?

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?

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

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

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

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

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!

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. 

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!

Chris Oursler: very helpful thank you

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

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GM 3100,3400 Thermostat Replacement