2000+...

I'm getting gunners engine. So it will depend on which one I use, I either swap over my timing chain cover or keep the one on the engine. It will depend on how the cam looks on my old engine.

This definitely worked. I'm using the red rtv every time now. I also don't use the Orings that come with the Dorman elbow - I ordered a bunch of them from GMPD and they are definitely thicker and larger in diameter. Thanks for the tip!

Got a part number on the Orings?

Oops - it was rock auto, not GMPD. The part number is AC Delco 1534066 (rock auto 15 15-34066). $0.80 each. 0.674" diameter. Seem to work well so far.

ymmot04 did you use the oversize O rings from Rock Auto? If so did it solve the problem? I have had a very small leak since I did the LIM over a year ago. I think the coolant elbows are leaking slighty when it is cold then again when it is cooling down. I suspect that at operating temp they are not leaking. I am adding a quart of antifreze every other month. I am very consciencious about cleaning parts before I put something back together, I am sure all the parts were throughly cleaned and I used vaseline to lube them up. I would try the red RTV sealant but I have not had the best of luck with that stuff in the past.

I did not, and that would not have solved my particular problem. My elbows were warping and I suspect that the LIM was warped. I ended up trading the car in before I had time to try swapping it.

I do not recommend using RTV sealant for the elbows. I tried it and it just makes a mess.

Can you actually see the coolant leaking from the elbows? They would leak mostly on a cold start before they have time to warm up and expand, so right after you start it at the beginning of the day would be the time to pop the hood and check for a leak.

Yes, thats exctly what is happening. After dealing with anti freeze on the floor in the garage for about a year without being able to figure out what was wrong I broke down and bought a radiator pressure tester. When I put 15 psi pressure on it when it is cold I can see antifreeze seeping out of both coolant elbows. Its not enough to be a major problem but it is a major nusense. I don't see any sense taking it apart and replacing the elbows with the same parts. I think I will order the oversize O rings and install them with the vaseline. Wish me luck!!

When you take your elbows out, check to see if they are straight or warped. They should be a perfect 90*. Also when you put them back in, make sure they don't have pressure on them, they should wiggle with the vaseline.

I just did my third set yesterday. This time I made sure the metal was dry, used RTV red as rec'd and was super careful to wiggle and lift the tensioner as I tightened the 3 bolts that hold it so it was level. I only wish I had gotten the oversize Orings, looking at the Dormans I took out, there is only one rubber Oring, the big joint. The other 3 melt to fit the opening so if you are a hair off, it will leak. If mine leak this time it'* the Rock Auto Orings for sure. Has anyone bought the GM elbows?
Also did the driver side blend door actuator motor, got it from Advanced for 110, much easier than anticipated and have heat on my side! Thanks to all that posted!