2001 Chevy Silverado Transmission Cooling Lines Leak - EASY FIX

[@jonathanfuller7330]

This has been the only video that shows what I was looking for thanks for posting

[@thedangerson]

Glad Freedom Garage could help. Thanks for watching.

[@54swingline]

Thank you -- I'm going to give this a try. Local Chevy dealership in Roanoke VA told me it would be $1200 to fix my leak.

[@thedangerson]

Hope it works for you.

[@rong.7852]

I just had to put a water pump in my 01 today and noticed the dusty damp trail starting to form at the top fitting. Great to now know the O ring size needed. Thanks for posting the video. My 01 has just a shade over 450K on it and is the second water pump I've put in it. I guess it's about time for the O rings to be changed. Thanks again for this video.

[@thedangerson]

450k on your truck?!?! Way to go! Glad this video helped you to love on it.

[@AugustoPanecatl]

Got the freaking issue with my 2014 Silverado, was thinking about changing the fittings and lines, saved me some bucks and tiem, great video pal 👍🏻👍🏻👍🏻

[@thedangerson]

Glad it helped. Thanks for watching!

[@dupren4374]

My 01 Silverado 2500 has been driving me crazy with the lower when leaking bought new line still leaked this helped tremendously thank you

[@thedangerson]

Glad it helped you! Thanks for watching. Feel free to subscribe and help me out.

[@donkrebs3554]

I appreciate the knowledge on the inner o-ring! I have run into multiple issues (intercooler bottom p/s) and had sum1 mention a broken seal! WELL THANKS TO YOU IK WHAT MY PROBLEM IS AND CAN AFFORS TO FIX MYSELF! TY FREEDOM GARAGE!!!🎉

[@thedangerson]

Our pleasure! Glad to be of service.

[@SheppyZed]

Great video!! Thanks. Every other video I found only suggested changing the whole line. Knew it had to be an oring of some sort.

[@thedangerson]

Glad it helped!

[@juancasias2991]

Thank you.. I learned something New today.

[@thedangerson]

Thanks for watching!

[@JerryGarcianotthesinger]

Thank you for the video. It is very informative. I see you used a black colored O Ring. In another video on U tube, I seen another mechanic had a Blue colored O Ring. And after some research, the Black O Rings are subject to deuteration by the ATF 4 chemicals. And I also found that green and yellow colored O Rings are manufactured to withstand oils and chemicals. This was the first time I seen a Blue colored O Ring. I think the video was by klowmy1960, labeled Leaking GM Transmission Cooling line Disconnect fitting.

[@thedangerson]

Hmmmm.....interesting about the O ring colors and what they are made of. I used what I had on hand. Seeing as my truck has 326k on the odometer and I have a tray full of those black O rings, I will probably just make it a yearly change. I would be interested to know what the "real" O ring part number is.....and what it is made of. Thank you for sharing, and watching.

[@JerryGarcianotthesinger]

@@thedangerson The part number is W5201 at O'Reilly's auto. it's a box of 270 HNBR Green assorted o rings.

[@jgrenwod]

Excellent! No other videos mention the Oring.

[@thedangerson]

Glad you liked it! Thanks for watching.

[@jbandersoninspection]

Currently having leaks at the transmission coupler on a Silverado 2500 HD with the Allison transmission. None of the parts stores can locate new couplers and the dealership shows 7 "different types so I'm rebuilding these now

[@joellive7564]

You the best brother 💪

[@thedangerson]

Glad you liked it.

[@letsbereal-hd8qt]

The Dorman 800-604 worked in the transmission but there's a different one for the composite radiator. Its probably the one right next to it in the store.....

[@josephshirah]

I just replaced the radiator in my 2010 Tahoe this afternoon. It’s got a 5.3 in it and it looks identical to the one in your video. After putting everything back together I noticed the top line (just like the one you referenced) had a steady drip of transmission fluid. I would assume that maybe the o-ring isn’t in place. I did make sure to get a tight fit and secure the locking clip properly. Just had a steady drip once I turned on the car.

[@thedangerson]

Yeah, a steady drip means that something is out of place -- either the fitting or the O ring. While I am not 100% sure on a 2010, it wouldn't surprise me if GM kept a very similar configuration. Good luck finding the leak source.

[@yoked2000]

Did you ever do the other end of the line on the trans? Wondering if they are the exact same fitting so I can just do both, Thanks!

[@thedangerson]

Thankfully I never had to do the transmission side. So I can't tell you whether it is the same fitting or not. If you end up replacing it, add a comment what you find out. I'd be interested to learn. Thanks for watching.

[@Qahtani99]

Fantastic thanks alot because our workshops techs said no seal inside

[@thedangerson]

Glad to help

[@davidblack1928]

Perfect video. Exactly what I needed.

[@thedangerson]

Glad it helped!

[@jerry4302356]

Thanks, video help me a lot!

[@thedangerson]

Glad to hear it! Thank you for watching.

[@michaeldunn9485]

the plug on my 1999 new model Serria 1500 lower is welded in it seems; how would you go about getting the fitting off the plastic radiator tank w/o breaking the radiator

[@thedangerson]

If it were my vehicle, I would "unweld" it (probably unsuccessfully) or more likely I would go to the junkyard and get a transmission cooler from another truck and put that in. I recently had to do that with the AC condenser (sits right by the trans cooler) for my son's 1998 Sierra. Good luck!

[@mr_bav2r]

Thank you this was very helful

[@thedangerson]

Glad it was helpful! Thanks for watching.

[@Thrasher6299]

Can I remove the fitting and swap the o ring without having to drain the coolant or disconnecting anything else?

[@thedangerson]

@jaimegarcia5573 .....If I remember correctly, I did not drain my trans fluid when I replaced the O ring on the upper line. You MAY have to on the lower line. Good luck!

[@Thrasher6299]

@@thedangerson thank you

[@andrewcastro2530]

Did the procedure as you showed. Leaking again. Should I replace the connector w a new one or do the lines wear out at the contact point? Thanks in advance

[@thedangerson]

I am unaware of the connector or line replacement. However, following the troubleshooting mantra - "go easy, go cheap" - I would redo the procedure and clean both sides (line side and trans radiator side) of the connection really good. There could be grime, particulate, or residue preventing a clean seal. I would also blow off both with compressed air after giving it a good wipe down. If that didn't work, I would maybe step up to one size larger or one size small O ring to see if those sealed better. If none of that worked, you can go down the line replacement path. Good luck! Wish I was there to help you.

[@andrewcastro2530]

I think it did hold up for a few weeks. I decided to get a new connector, Dorman Brand 6$ at Auto zone. No Leaks . Will monitor and keep an eye out. That little pick set was on sale for 1.49 at HF. I removed the air box and it made the the procedure much easier. Retired so I have time to do these little Maintenance fixes with a little help from guys like you on You Tube. So Thanks for what you do.

[@thedangerson]

@Andrew Castro.....so glad to hear you have it fixed. Thanks for watching.....and feel to stop by Freedom Garage if you are ever in the Louisville area.

[@yoked2000]

@@andrewcastro2530 Andrew - do you have the part number for the fitting? That's what I've been looking for, Thanks

[@condor5635]

Great idea it just scares me a little to remove the part from the radiator which I believe is plastic threads. Maybe try replacing the O-ring while it’s in place? Or is that too difficult?

[@thedangerson]

The O ring can only be replaced by removing the line so you have access to the fitting. Good luck and thanks for watching.

[@rong.7852]

The fitting seats into a metal line section in the radiator. There's no worries of plastic threads.

[@condor5635]

@@rong.7852- that’s good to know! Thanks

[@rong.7852]

I thought about just pulling it and changing the O ring but decided to get a new fitting with O ring already in place and figured it the better way to go since the fitting needed to come out. Be sure to put a drop of T Fluid in the neck of the fitting to wet the O ring before installing it and a drop on the line as well. My 01 has >450K on it.

[@letsbereal-hd8qt]

The adapter with the o ring included is Dorman 800-604

[@thedangerson]

Thank you for adding that information for others to user. Thanks for watching.

[@fonzyflowerz2804]

I replaced the whole thing. A new nut with O-Rings on a 2011 silverado 5.3 V8. Brought it @ Auto Zone for $10.71.

[@thedangerson]

Well done!

[@jirimarak2860]

Hi I just replaced the radiator and I have a leak by lower line joint as you showed in video but it is coolant not a transmission fluid. Do you have any idea what is going on? I have chevy uplander 2006 3.5l.

[@thedangerson]

That whole area up front has your radiator, your trans cooler, and your AC condenser. If you are leaking coolant (and you just recently replaced the radiator), you have a leak in either the coolant lines or the radiator itself. Thankfully, those are easier to fix because they are just hose clamps. Check all connections. Thanks for watching.

[@alex.8oh586]

i replaced the line and the fitting next day started to leak any answers?

[@thedangerson]

Check that the line: 1) is firmly fitted into the housing 2) that the O ring is properly seated. Good luck!

[@alex.8oh586]

@@thedangersonwill do this weekend

[@thedangerson]

@@alex.8oh586 Good luck! Also, make sure everything is wiped down and clean. Any grit or dirt on the fitting or O ring could impact the seal and cause it to leak.

[@eduahpeteschwenk8453]

You can change the whole fitting also ? Only 6 $ at auto parts store.

[@thedangerson]

Mine didn't need replacement, just the O ring. But that is good to know.

[@eduahpeteschwenk8453]

@@thedangerson i changed one whole fitting and the other just the oring. Both worked great. O ring definitely a cheaper option.

[@imyourhuckleberry5350]

I did this on my 01 hd 2500 and my upper transmission line is still giving me a leak it's driving me nuts. The rest of the lines are doing well after replacing the o rings

[@thedangerson]

Following a mechanics philosophy "Go cheap, go easy", before replacing the line and connection, you might disconnect the upper one more time, clean the male and female connections, and try another O ring. Good luck!

[@ralphsnyder6503]

What size o-ring on a 2001 GMC Jimmy 4x4 it's bigger than the one your putting in

[@thedangerson]

I have no idea. But you might get that O ring kit from Harbor Freight and try the different sizes.

[@RealDeal458]

Could even brand new fittings that came already in the new radiator still have this problem?

[@thedangerson]

Anything is possible. This is an easy and cheap enough fix for you to check them just to make sure. The hardest part will be removing all the plastic shrouds around the radiator (which isn't a big deal). Good luck and thanks for watching.

[@fidelrodriguez6941]

@@thedangerson can it be the seals that before connecting the fitting to cause I have a Chevy blazer 2001 cause mine is still leaking

[@l.w.f.c3291]

Life savor ! Thanks

[@thedangerson]

Happy to help

[@RogueKnight33]

THANK.YOU!!!!!!

[@thedangerson]

My pleasure! Thanks for watching.

[@Canon1DMkII]

Had the same issue with my lower line.

[@thedangerson]

Super easy to fix once you know what's causing it. Drive safely.

[@maximobautista9671]

Thanks.🙏

[@thedangerson]

My pleasure!

[@lanceroth7848]

Better to put the clip back on then push the line in , that way you can hear it click in place

[@thedangerson]

Great suggestion!

[@AntonioSanchez-zs2ep]

Awesome appreciate it

[@thedangerson]

Glad to help

[@letsbereal-hd8qt]

The fitting adapter with the new O ring is $8.00

[@thedangerson]

Good to know. Feel free to share the part number in a comment.

[@chada472]

Easier fix is just re crimp the fittings. You can do it all in place!

[@thedangerson]

Agreed. However, most folks don't have the proper tools for that.

[@Valdemar-Perez-III]

I should’ve done that to start off with rather than replace both transmission lines in the heat of the day lmao.

[@MrCosmos110]

Auto Ministry = Excellent Idea ! ! ! Colossians 3:23-24 ---> 23 And whatsoever ye do, do it heartily, as to the Lord, and not unto men; 24 Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ. ...............

[@thedangerson]

Stop by if you are ever in the area. God bless you and thanks for watching.

[@technicgaming1490]

Thank you for forcing your false religion upon me