GM 3100,3400 Thermostat Replacement




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Joe Edwards: OK I just want to add this as I have done the knuckle busting, the skin slicing, and all the things that make you want to just beat someone that was on this design team. I ran out of expletives before I figured a way to beat this problem, and it is very easy to do once you look at what these engineers built and the limitations they give you when it comes to close quarter space Just take off the throttle body hose, the air filter cover and take out the air filter. the air filter box is a good place to put a big light to shine towards the thermostat housing. Remove the upper radiator hose from the thermostat housing, and bend it out of the way so you can work. take out the thermostat forward or upper bolt completely with a 13 mm socket or universal socket. if it falls, you shouldn't have a lot of difficulty finding it, but if you want to use the rag method, your choice. you can use a long 13 mm open end box wrench to access the rear bolt from behind all this mess. Shine a small flashlight that will let you see the rear bolt, you can rest it somewhere around the throttle body You will be doing a lot of turns to get this method to work, and you will be flipping the wrench to grab the bolt for each tiny turn using the open end side. Reach in with your right hand and wrench and do this from the back side of the motor right above the transaxle housing. loosen the bolt until you can pull the housing out, you may only have a couple or three thread grips inside the thermostat housing mounting surface. I found that doing this with my right hand, and leaning on my left arm with my head, I could get comfortable, and using a small flashlight shining down onto the rear bolt area, you can see what you are doing. Now wiggle that housing and get it over the thermostat, or try to get them both at the same time. your results will vary. Once you get the housing and thermostat out, clean it off, and put a thin layer of rtv on the back side of the thermostat, to help it stay in place. now go find yourself a nice sharp hacksaw, and cut off about a quarter inch off the upper slotted tang, tab, ear, whatever you want to call it, just make sure you leave enough so the bolt has enough to tighten down on, as long as you can see the old wear marks from the head of the bolt, you should be fine. Removing the upper slotted tang(?) gives you enough room with the rear bolt still in place (but only a couple or few threads inside the motor) to get the housing to go over the thermostat nose, and turn the housing into position. With the tang cut off, it gives you the clearance in the front to turn and twist the housing into place.Make Sure the thermostat is still in place, and hasn't slipped before you snug down the front bolt Get the front/upper bolt semi snug, and check your alignment, then tighten the rear bolt. tighten the bolts, and reassemble what you removed to get it out. I did this method, and the rear bolt is a slow process to tighten down, but it works, and you don't have to remove anything else that others are saying like the exhaust crossover, and the black cooling pipe. It's tight, but can be done this way. As a precaution, I will suggest you find a good sticky wide bandaid to cover the back of your right hand before you do it this way, especially if you have high veins to avoid the "red paint" from any of the sharp metal. I turned wrenches for 17 years for a living, and there is no reason for a thermostat which should be done start to finish including the refill in about an hour, to take as long as this does. 

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?

Johnny Beem: Ohh My God . This job took me Approx. 5 hours to do. Most thermostats are usually a 10- 15 minute job I will never do this one my self again that second bolt kicked my A$$. 

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

My MK II: Great video! I struggled with that 2nd bolt on the thermostat, even dropped it 3 times. Thank God for a magnetic telescoping wand to retrieve it. I wish I had a curved box wrench like you used it would have made it easier to do.

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!

Sir Pyro: Thanks for sharing this. I wonder if this is my problem. I do have a 2004 Monte and when I'm sitting with the engine running. It goes to HOT very fast. If I rev my engine to above 2500 rpms, it immediately goes back to a normal temperature. Within a few seconds. I've not seen anything like this. It will go to hot very fast when the rpm's are below 2500, and as soon as I hit the gas, the temp will go right back down. Do you have advice for this problem?

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.

Michael Hamill: Hi, great video. I have a 1999 monte carlo, 3.1 L. Is it essentially the same process? Also did you need to disconnect the battery before starting the job?

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

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 

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

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

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 !!!!

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.

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

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. 

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...

TheGBprogamer: Worst gm engine ever

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

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

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! 

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

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

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

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.

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 :(

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...

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.

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

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

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

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

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GM 3100,3400 Thermostat Replacement