2002-2009 4.2L GMC Envoy Trailblazer a/c compressor replacement

[@donaldmoore6967]

You sir are the man, you remind me of my cousin Jimmy now deceased, we repaired 100's of vehicles together.

[@juliantorres8664]

Sorry for you loss

[@jeffreystrickland6437]

Just to add my little advice that gave me more room to work with. Being I'ma big guy with big hands and big forearms. I just took the fan and fan shroud off. And left the battery alone. It gave me a lot of room. But thanks a lot for this video. Very helpful

[@voidisyinyangvoidisyinyang885]

This vid has become a classic in TrailBlazer repair vids - thanks very much. My AC works sometimes but mostly not. The Compressor was replaced once already about 100K miles back but someone is telling me my AC Compressor must be failing. Maybe the serpentine belt will freeze up again and break? Last time I was told it was just the tension automatic adjustor - so they replaced that. haha. Thanks again.

[@mjb12141963]

Awesome video. I have the Trailblazer. I had a noise that disappeared with the belt off so I been going through all the accessories. The fan clutch was shot, so I replaced the water pump as well. The alternator was sketchy so i changed that. The tensioner pulley was making noise so I changed that. The P/S pump is quiet. So I checked the a/c and the pulley is loose. Thanks for the assist. Next is a new exhaust. 220,000+ and runs like she should.

[@wullahblack6452]

I've gone through like three or so fan clutches in mine. The current one ever since i installed it has a random "tick" here and there but it's been fine for 50k so far.

[@mjb12141963]

@@wullahblack6452 Mine did a tick-tick-tick-tick. Then do it again when it first started. Especially in winter when it was below freezing. It stopped when it went bad this last time. It lasted at least 80,000. It has 230,000 now. Just did all new brakes and another exhaust from Autozone exhaust parts isle. LOL

[@wullahblack6452]

@@mjb12141963 That is the nice thing about them. They made so many of these vehicles across five different GM brands that the parts are still easy to get, not to mention cheap! My 03 LTZ is the best used car I ever bought. I have been looking to get a used SS but it is very difficult to find one that hasn't been driven into the ground :D

[@mjb12141963]

@@wullahblack6452 what 5 different brands?

[@wullahblack6452]

@@mjb12141963 Buick Rainier, Oldsmobile Bravada, GMC Envoy, Saab 9-7x, Izuzu Ascender And of course, the Chevy Trailblazer. So six total variants.

[@terencescott3957]

Learned just what I needed to know. Total oil capacity. I'm doing a full system changeout.

[@huongasphuk6029]

This guy is awesome. This video totally helped me fix my "dirt road queen" lol!!!!

[@jaywerne3812]

Excellent video and enjoyed hearing “Tool” swamp song playing in the background

[@glennmorrison7704]

Thanks a lot your video came in very handy and helped out greatly. Since we are back yard mechanics.

[@RustBeltAuto]

You're welcome, thanks for watching!

[@woodybear8298]

Great video. I'm doing this to our 2004 Buick Ranier. Thank you.

[@averydomingue4638]

good video but the problem is when the compressor takes a dump, it usually sends a bunch of trash into the condenser. if you dont replace the condenser, it wont cool down the refrigerant because it is clogged up, which equals all that work and money spent and it still wont cool the cabin very well. word of advice from someone with an automotive 609 a/c license, every single time your compressor takes a dump, replace the accumulator / drier, orifice tube / expansion valve and condenser. do not ignore this advice or youre more than likely not going to get the cold air you want.

[@RustBeltAuto]

There is a cost factor involved most are not willing to pay, so I didn't do it. All that aside, it blows cold as new the way it is, and it's still working. If they complained about air quality, I would have sold more parts. I am also MACS certified, and do realize the consensus is to sell as many parts as possible to make the most amount of money while telling people if they do not do it, it will not work. Essentially it is less than a half truth. The truth is, people don"t know if there is "trash" in the system, or how much, or how much moisture is in the system. The consensus disregards how the components in the system have failed. It's a guess, so the consensus is to just do it, just in case, and makes people spend gob loads of money, or else. Making what you are taught borderline illegal. Truth is, the system required a compressor, and may require one again. I could sell more if the air quality was not good enough. A good way to look for trash in the system is to take out the fixed orifice tube, and see what comes with it. When I retrofitted 134a, a long time ago, we used a cleaner, and pressure pot to clean the system, replaced the drier, and FOT. It is a better idea than replacing a few parts that people do now days. There is always going to be residual particles of metal (mostly aluminum) in the lines, and other parts you do not replace that is mixed with the left over oil, and stuck to the inside of the parts. Essentially, I believe that what just about everyone does with an A/C repair is a dirty hack job full of half truths. I try to be honest, and tell the victim what the failed part is, what the standard recommendation is, give them the good, better, best scenario, and let them be the deciding factor. I hope I do not need to explain what I do with A/C systems to you guru's anymore. It is quite mundane to me. Thanks for watching. I hope something i did helped you in some way. Sorry for the long post.

[@averydomingue4638]

@@RustBeltAuto no I wasnt criticizing you Sir. it is an excellent video. just explaining to the other viewers.

[@RustBeltAuto]

@@averydomingue4638 fair enough.

[@jasonsimmons6684]

Actually you can flush the system, replace comp and accumulator, as well as orifice tube. Most parts houses require those parts for comp warranty anyhow.

[@kevyythemechanic]

That pink sticker you took off is what tells you how much is in there , it’s 3 oz I believe . It calls for 8.5 oz if you have rear ac And you can get to the compressor from the bottom and through the wheel a lot easier

[@RustBeltAuto]

Is yours 4 wheel drive?

[@kevyythemechanic]

@@RustBeltAuto no it’s not , is this one 4WD?

[@RustBeltAuto]

@@kevyythemechanic yes. I think there was a big fat axle in my way.

[@kevyythemechanic]

@@RustBeltAuto 😂😂 my b

[@DeAndreMaurice]

Keep her clean champ.. These Trailblazers are to be respected

[@ianconley6673]

Lol "can't you just" belt is wild work

[@apriloliver-glass7800]

Dude ,for everyone that doesn't know,you haven't got to take off the alternator or the battery ,the thing will drop out the bottom

[@RustBeltAuto]

You probaly have 2 wheel drive. 4 wheel drive has a big ugly axle in the way. We don't have those in these parts. They get stuck in the snow. If we want to get stuck in the snow, we just buy a car.

[@cecilleflowerfarm]

Thank you for your video on how to,I’m in a middle of doing this thing it’s really pain in a rear end,I have 2004 trailblazer.I didn’t took off the battery but I took off the tire and it makes a little easier to take off the two lower compressor bolts.its a back breaking diy considering I’m only 5’2 female.😜

[@RustBeltAuto]

Handy woman Cart. You are welcome. I took the battery tray out to make more room to get the compressor out. Not much room for it.

[@JC-jh6cz]

Hello lady good for you u are doing your repairs how did it go any troubles

[@arlenephillips6388]

Very helpful thank you was wondering how the heck was going to get compressor out

[@RustBeltAuto]

I wondered the same thing.

[@ricomunoz2505]

What port do you add the oil to? What happens if you add oil to both ports??

[@RustBeltAuto]

I have never known it to matter. The oil goes where it wants.

[@joesakr5566]

Thank u dude I was able to fix mine

[@joshmudgett7418]

Your very entertaining and informative. Great tips! I'm about to put them to use.

[@RustBeltAuto]

Good luck!

[@dirkayala5812]

I just picked one these rigs up last weekend. Good vid...Subbed!

[@RustBeltAuto]

Thank you!

[@anthonyarreguin9869]

Thanks for the video it was very helpful did the job myself

[@RustBeltAuto]

You're welcome. Thanks for watching!

[@kelbycross8115]

What oil do we put back in the compressor?

[@RustBeltAuto]

@@kelbycross8115 did you watch the video?

[@leannemc.4314]

Sir you said if you change the ac compressor, you have to change vacuum the ac out, but you said to change the drier thing too

[@DeathGrimmR]

Thanks for the how to video. My pulley locked up on mine but clutch still spins if turn by hand. Are they 10 or 15mm bolts on the compressor?

[@garysample1980]

Would you know what size stud that is? I have to replace mine

[@anastasiolanda9729]

Where i can get the stud puller socket?

[@RustBeltAuto]

Got mine from Mac. Google "stud socket", and a bunch will show up.

[@ramonmina385]

What size was the socket stud remover?

[@RustBeltAuto]

Cannot remember. Have a whole set.

[@UraRengeJounin]

How do I find one of those long, powered socket wrenches? What are they called?

[@RustBeltAuto]

You mean an impact wrench or air ratchet or something?

[@botijasbonyvillareal]

How about Friend, how did you remove the gas tubes from the compressor?

[@joeturtleneck2300]

unbolt them

[@arifelassal2874]

Does it matter which side i use to put the pag oil I saw that you put in the small side I did put 30z in each side is that fine ?? Some one answer plz

[@RustBeltAuto]

I put it in the cold side. Just run the thing.

[@arifelassal2874]

Rust Belt Auto so it wouldn’t effect it if I put 3* oz in each side will I be safe or I have to do it again

[@RustBeltAuto]

@@arifelassal2874 6 oz seems like a little much unless the system is completely dry, or replace other parts. I usually do about 3 oz. Just run the thing.

[@RustBeltAuto]

On a positive note, that car's A/c still works fine, and it doesn't matter what hole it goes in. Oil in the system is flying all over the place.

[@arifelassal2874]

Thank you sir it works amazing and yes I changed the compressor and condenser accumulator and orffice tube

[@andrewguzik6940]

I have a couple of questions if you could pretty please answer first off...how do I drain the system without it Exploding on me and 2nd off is it easier to remove the ac compressor without geting under the car after you remove the hose? Please answer!!!

[@RustBeltAuto]

Go to a shop and have them re-claim the refrigerant. You second answer is, you can try. Good luck!

[@jasonsimmons6684]

It'll blow out if you crack a line pretty much any where. Although, you should get it removed by a pro and in some states it's probably illegal to just let it go.

[@MegaShowtime85]

It’s a brand new ac compressor. Should I drain the oil in it or just added to it?

[@RustBeltAuto]

You are supposed to dump it out.

[@alanbarnes4991]

Thank you so much. I bought a compressor off Amazon, but it didn't come with the compressor stud. I used your double nut method (actually did 4 nuts because wow was that bitch stuck) but I finally got it out. Really appreciate your video.

[@leannemc.4314]

Also what kind of oil did you use

[@RustBeltAuto]

probably PAG 46.

[@leannemc.4314]

@@RustBeltAuto that's the oil you poured into the compressor

[@RustBeltAuto]

@@leannemc.4314 I think so.

[@joshkissane3914]

How long did it take to do this job

[@RustBeltAuto]

I dont know

[@MichaelBennettEFAddict]

thanks for the video.

[@jerryc3201]

I can't find the ac pressure switch wire that plugs into the compressor itself. Do you know where it comes out of the wire loom so I can locate it?

[@RustBeltAuto]

Sometimes they are not on the compressor on some vehicles. If it works without it, it is probably not used, or someplace else. Should be on the high side line somewhere. Did you ever unplug it?

[@trinidadbreeze]

you can use a a shorter belt and bypass compressor routed the same way belt number k060695

[@lnvertedCross]

This is something you did? Was there any issues with it slipping?

[@deeznutsinyourmouth6035]

Hi sir how long did this job take u

[@RustBeltAuto]

Can't remember.

[@jeffsgarage1969]

Thank you 🇺🇸

[@MrPosey85]

Errrrr.... You made my life easy thank you

[@ransompalinski5875]

Wheres the high pressure valve on this i know where the low pressure one is

[@RustBeltAuto]

It depends on the vehicle. Follow the high pressure line around (the little one) it could be anywhere. Once in a while the manufacturers put it on the big line, before the fixed orifice tube, if it has one.

[@oldguitarhack]

Huge help! Thanks!

[@ricaard]

Sweet, I'm on it!

[@MegaShowtime85]

Thank you and how much oil should I put in it?

[@RustBeltAuto]

There should be a yellow sticker somewhere in the engine compartment that will tell you how much goes in the system. Drain out old compressor, and add the same amount plus 3 ounces if you had a large leak, and an empty system. Or just the amount drained plus about an ounce if it was full of refrigerant and no oil leaked out. There should be oil in the new compressor too. 3 ounces extra is safe almost always.

[@Asa700]

@@RustBeltAuto please help me I can't found any thing tell me how much should I put I have GMC envoy XL 2006

[@RustBeltAuto]

@@Asa700empty new compressor. drain old compressor. Add that amount, plus an extra ounce. If it had a small leak, and emptied the system, add an ounce. Large leak, like a line broke, or big hole, add 3 ounces.

[@Asa700]

@@RustBeltAuto thank you

[@MegaShowtime85]

What type oil did you put in the ac compressor?

[@RustBeltAuto]

pag 46 with dye oil

[@angeredpanda2787]

Did you have ac on when you vacuum it ?

[@RustBeltAuto]

Nope. Just sucking air.

[@SuperLattifa1]

How much does a job like this cost today?

[@RustBeltAuto]

I don't know

[@DeAndreMaurice]

Put some respect on the TrailBlazer

[@brianvanzile5788]

What size was that can't you just belt?

[@RustBeltAuto]

I don't know. If you ask for a belt with no a/C, that will probably be your can't you just belt.

[@weightsidegamer4563]

Take alternstor off first. Then disconnect the connections to it

[@weightsidegamer4563]

How to bleed ac lines?

[@RustBeltAuto]

You should really go to a shop that does A/C work, and have them re-claim it.

[@weightsidegamer4563]

@@RustBeltAuto can i not do this one myself?

[@RustBeltAuto]

You are not supposed to open referigant to the atmosphere, by slightly unscrewing a line, to let it slowly leak out, or slightly unscrewing a Schrader valve. I think it's illegal.

[@weightsidegamer4563]

@@RustBeltAuto can i use a vacuum pump?

[@weightsidegamer4563]

@@RustBeltAuto my 2002 has a bipassed ac compressor. Shorter belt. I dont plan on changing out the dryer

[@cesargomez1637]

There's a easy way to pull it out by the front driver tire...

[@dizzlefoshizzle4980]

is that TOOL playing in the background?

[@RustBeltAuto]

No. Due to copyright infringements, there is no TOOL playing in the background.

[@lloydwilliams624]

Much easier to just take out from bottom

[@RustBeltAuto]

Do you have 2 wheel drive?

[@j0s3b4rr3r4]

I still don't understand how to get the bolt off the compressor. Help please!!!

[@RustBeltAuto]

I used a swivel ratchet, and a short ratchet on that car truck thing. I think they are all 15mm.

[@j0s3b4rr3r4]

Thank you👍

[@RustBeltAuto]

@@j0s3b4rr3r4 welcome. Hope it helps.

[@stephenmckee6439]

You do good work but you don't want to put the oil from that locked up to compressor in that new compressor you will be sorry

[@RustBeltAuto]

It's still working. 🙃

[@alyssajansma9905]

I think I'm having the same issue in my 05 envoy. When my car is blowing on defrost or any air at all it stalls out. Nobody can seem to figure out my issue. Just had my exhaust all replaced from the manifold to the converter to try to solve the issue and it did nothing

[@RustBeltAuto]

What!?!?!?!?!?! There is an exhaust pressure gauge you screw into your o2 bung to see if it has excessive back pressure. Unplug your AC clutch if you believe your compressor is the problem, drive it around a bunch, and see if it doesn't die.

[@techfive7202]

Works okay when your driving down the rd?

[@duckhunter8387]

That was Fking awesome

[@DHMSLLC]

I would like to watch this video but it won't load up.

[@RustBeltAuto]

Strange. It works for me.

[@DHMSLLC]

All the other videos load up fine but this one. All I get is a black screen with that stupid circle going around and around.@@RustBeltAuto

[@RustBeltAuto]

@@DHMSLLC Maybe it's too good for you, or KZbin doesn't like me anymore? I don't know what to say? I can watch it. I logged out of my account, and watched it too.

[@ormonddude]

LOL If you go at it from the bottom you don't need to remove anything just disconnect the battery

[@RustBeltAuto]

There is a big front axle in the way. You must have 2wd.

[@thegrimtaho]

Yeah if it's 4WD you can't get at it from the driver's tire.

[@blytheville870]

@@thegrimtaho Hello, I have a 2WD Envoy and I'm trying to figure out how difficult it were to replace the ac compressor. Mine has recentely started grinding.

[@timgurley585]

.

[@chlu3137]

Uhhhhh Ughhh Rrrrrrrrrrrrrrrrrrr Rrrrrrr

[@RustBeltAuto]

Whatchu mean?

[@chlu3137]

More room after removing the battery box .lol never any room to work