GM 3100,3400 Thermostat Replacement




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Did this video help you?

Cedric Ward: DUDE THIS IS AN AWESOME VIDEO BUT WHERE CAN I PURCHASE THAT CURVED WRENCH, THAT BOTTOM BOLT IS KICKING MY AZZ... MUCH APPRECIATED!

Ismael Griego: How did you remove the top bolt? I can't even get the top bolt to budge. They're both ok there super tight and I don't have enough leverage to get the bottom bolt 

Barbie Gifford: I found that if you remove the throttle body it make it a LOT easier to get to the bottom bolt and it also give you the opportunity to clean the EGR port in the intake while you are in there.

HARRY LEE: Why are import cars much easier to work on than GM build cars?

TheYzeman: I have a 1999 Chevy Lumina. The thermostat housing bolts will not move at all! I tried pb blast and tapping with a hammer on the upper bolt. Why are they seized on their so bad? Is there something else I can try?

Emily Woodard: uggh i hate that my engine is so tightly sqeeze with everything ,i took everything off like in the Video but stuck with the bottom nut , im almost there ,Thanks for the Video it helped alot !!!!

Bak Draft: The slot on the thermo house is meant to loosen the bottom bolt and slide it off w/o removing the bolt.

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

Ryan Moore: I can't get the bottom bolt off my thermostat housing on my grad am gt. Do I go upward or downward when trying to get it off

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

cubcadet1983: My man saved me once again. Thank you.

gocrazitalian: Watching this I am wondering if you can leave the bottom screw in place, as I noticed a slot on the housing. I am thinking the slot would allow to leave the bottom bolt in place while removing the housing after loosening the bottom bolt to allow that. I have a 2005 Impala, 3.4L

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.

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. 

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

TheGBprogamer: Worst gm engine ever

Roger DeWeese: i cant get the bottom bolt to come out\

Ryan Moore: Also the exhaust pipe it's blocking it and only has a small space

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...

Te Jo: First of all, THANK YOU for taking the time to make this ‘how to’ video; it’s VERY helpful. I‘m still having some problems, however, replacing the thermostat on my 2000 Buick Century. I can’t remove the upper bolt on the Thermostat Housing; I don’t know if it’s frozen in place or, I just can’t reach it well enough to get a good grip on it (or both). There are two horizontal pipes in the way, one’s black and the other’s silver. I tried ‘liquid wrench’ on the bolt and gave it several good taps, but it won’t budge. To access the bolt better, I tried to remove the Throttle Body. I removed the nut on the lower right side of the TB (in front of the small black plate that’s attached to the black pipe). However, I can’t seem to remove the stud bolt that comes from the Throttle Body and extends through the slot in the small black plate. I’m wondering if I should try to remove the black and silver horizontal pipes that are blocking access to the upper bolt on the Thermostat Housing. By the way, the lower bolt on the TH also seems be frozen or, I can’t get enough leverage (or both). I would appreciate any advice that anyone can give me. THANKS! 

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

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 

shelton williams: Olds cutlass supreme 1996 with 3.1

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

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

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.

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...

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 :(

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.

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.

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

JambzModz: hard or nah

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.

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

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

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. 

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

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!

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!!

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.

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

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.

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?

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!

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

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GM 3100,3400 Thermostat Replacement