GM 3.4 Thermostat Replacement - '03 Montana 

Best video on a Montana thermostat I found. I'm doing it myself I a snowpocalypse in Banff and this video is saving my life . Thank you !!!!

Thank you guys so much for making this video, Chevrolet was about to charge me $400 to do this.... i’m entry level so it took me about a day and a half with beer breaks in between lol but it definitely beats $400 and now I know how to do it. Thank you!

Wow. Just found your channel. Exactly what I was looking for. I couldn't figure out how to get that other stud off. Now I know.. Thank you..

Hands dow best 3.4 thermostat tutorial period i watched 6 videos before i found this one they all sucked

Holy! GM sure doesn';t make it easy to perform what should be a simple task!

I used a stubby Gearwrench for that bottom t-stat housing bolt, it made the process of getting the that sucker loose much faster. I also cut off half of the bottom tab off so that if I need to do it again I "hopefully" wont have to loosen the bolt as far. Its a shame something that takes 15 minutes on most vehicles takes 2 hours on these vans.

Back screw is a P.I.T.A... I'm gonna remove the throttle body.... Tanks for showing this to me....

Great vid thanks a bunch!!!

Need to see how you removed/installed the housing!! I’m having trouble with it! I know you said lean it outward, but mine is too narrow!

Only problem I saw was the leftover nut in the tray that should have gone on the bottom of the throttle bracket. 😁 Good video, i watch stuff like this to see if others have tricks that i dont use.

Thanks for this video! I managed to do it without removing throttle body or cables but it wasnt easy, i have bad luck with that van everything that comes apart breaks so i left it as much together as i could. That rear thermostat bolt was the worst! Cut myself many times getting it in and out. Why couldnt they put the thermostat where the bleeder screw is on that pipe!!!

Very good video

Awesome buddy really good job it will help a lot for me to do it. thanks

This video was very helpful thank you Julio V Good luck

Mann... you make THIS job look so simple( when I know it'd not easy,) good job though I need one done on my 2004 venture im really skeptical about letting any ol Mechanic do the job ,cause when I got the van used ,I change out all the bad juices along with faulty parts and the thermo was one of the faulty ones Thing is... mechanic broke my throttle body, so I think this round , Id might have to take it to the professionals

I just did this yesterday and what a pain that back bolt on the thermostat housing was and took forever even with a ratcheting flex head gear wrench! I decided to go with a 180 degree AcDelco thermostat to help keep it running 15 degrees cooler and help the antifreeze coolant last longer since heat breaks down fluid.

I need to change my thermostat tomorrow and thank you so much for the time you put into making this video!!

For me it is more easy removing the exhaust cross tube instead the throttle body. 1 night before you work over the engine, apply penetrating fluid in the exhaust tube washers or screws to avoid get broken when unscrewing. Just a tip work very good for me.

Thank you,

Will be doing this on a Venture soon, the thermostat seems to be stuck open. In cold weather, the engine temperature stays too low when driving, warms up a bit when stationary.

I attempted this a few years ago. Removed the throttle body and a lot of other crap, and ended up with enough room to put a wrench on the inside bolt, but alas, ended up stripping the bolt nevertheless. The bolt head is very thin and the position is very awkward. Had to put everything back together.

What was that plastic tube you plugged back into the air duct next to the sensor and how does it connect at the back of the engine? 16:27

Thankyou!!

Great step by step, sadly as easy as it looks, I am going to opt to have a mechanic do this, i just cant see myself doing all this work when its almost freezing temps outside and I dont have a garage to work in to stay warm, and Im kind of on a time crunch.

5:10 How in the literal hell did you get the seconds nut off of TB on bottom right?

Hey matt i followed the directions... The thermostat replacement was a success (i thought) but after putting everything back together my car won't start ...any advice🤷

Im only 3 minutes in but, i dont think you have to remove all that. I can get to it just fine without the removal of the throttle cables, coolant resevoir, support arm, or the throttle body. If you reach under the exhaust pipe, youl find you can get to the 2nd bolt. You dont have to take the whole bolt off, just loosen it because the bolt hole slides just enough to get the stat out. Just my way of doing it.

Does it need to be a 195 thermostat? I’m wanting to use a 180

Matt's Garage, where was the gauge riding in moderately cold temps, I have a 2000, it is running exacty 1/4 of the way up the gauge, heat is luke warm, this is in 10 degree weather or so, is this normal? Thanks!

Would this be the same for an 04 pontiac montana

What’s the labor time for this

Where is the coolant sensor? Where is the cooling fan sensor switch?

How long in real time did this job take.?

Mostrar una afinacion

As I pass my 3rd tedious hour trying to remove that bottom bolt, doing my best impersonation of a circus contortionist, and wondering how I’ll ever get it back on (realizing that it can’t be “loosened” because it isn’t fu$&ing notched), I realized that this is the most ridiculous auto repair I’ve done thus far. All for a stupid thermostat. If you are in a shop with specialty tools, it isn’t bad. A layman backyard beginner mechanic such as myself, will find themselves infuriated at how the designers placed the housing where they did, and may find themselves regretting even trying to do this...

I don't remove the throttle body or the heat shield or the crossover pipe even to do that job. This is the most difficult and rediculouse simple job I have ever done! I hate GM 3.4 motor and this motor has made me hate GM period!!!! This is on my list of vehicles that I will NEVER EVER own again! Run away from this shit motor! The transmission isn't even good enough for the shit engine in this shit car!!! 🔥All GM 3.4 motors!!

Not an easy job. And good luck changing the EGR valve in 30 minutes the one bolt is nearly impossible to reach. I know cause I've done 2 lower intake manifold gaskets on these vans and EGR valve bolts was the most difficult part.