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Old 12-11-2009, 06:37 PM
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Coolant leak on Y2K Impala.

I don't have the usual plenum leak as customarily is found on this 3800 Series 2 3.8 liter engine, I have one that I have only found 1 link to and cannot access it as I evidently am no longer a member of that particular forum for some reason or another, mainly I think because I really haven't visited it in over 4 years.

Most coolant leaks on the 3800 are attributed to the upper plenum to lower plenum, and a new upper solves it.

Mine is leaking (I checked it VERY throughly) out the lower intake manifold just above the water pump pulley where a 90 degree steel line connects the lower manifold and something else, I didn't have to actually get into unbolting anything to find the leak, good old fashioned common sense of filling to the brim, bleeding all the air I could, and letting it sit here and idle for 10 minutes, then revving to about 2000 rpms for a few seconds, then letting off and watching the nice pencil lead sized stream shoot out of that fitting in the lower manifold right into the idler pulley, serpentine belt, and then spraying everything else.

I found the leak, now where do I find the steel line to fix it, or would it be better to tap threads and run a section of nylon line that can be easily replaced, I know check the dealer, but it's Friday night here and they don't re-open until Monday morning.

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Old 12-11-2009, 07:12 PM
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GREAT, I just found a VERY informative how-to on the elbow replacement on this engine, they say with new ones (there are 2, there always has to be double the trouble somewhere) that it should only take about an hour, and nothing major has to be done to accomplish the job, they even include pictures and detailed directions on their nice hands on how to write up.

Quote:
Originally Posted by Jayme, on the NAIOA forum:
The coolant elbows are plastic pieces that run between the belt tensioner and block, and tensioner and water pump. Eventually, they get brittle and crack, letting coolant pour down the side of the block.
The upper elbow is GM p/n 12565082, and the lower one is 24503423. I got mine at the dealer, $5.50 for the upper and $13.30 for the lower.
If either of yours are leaking, buy and change them both, as they both must be removed to change either one.
Looks like the wife will have to possibly mess with a fill-up or 2 of the tank and leave the cap on the first setting so she doesn't lose all the coolant to work and back twice until I can get the parts on Monday.

Kinda sucks, the daily driver has to be on the sick/injured list.

Last edited by M&M CUSTOM; 12-11-2009 at 07:18 PM.
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Old 12-11-2009, 07:19 PM
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Coolant leak on Y2K Impala.

auto zone has the fitting that screws in and has the plastic o ring on other end , if it's not the tubing itself
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Old 12-11-2009, 07:24 PM
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I haven't found it on either Auto Zone's OR Advance Auto's websites.
They are both push-in 90 degree plastic pieces.
Here's a pic taken from Jayme's write-up.

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Last edited by M&M CUSTOM; 12-11-2009 at 07:30 PM.
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Old 12-11-2009, 07:36 PM
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Quote:
Originally Posted by M&M CUSTOM
I haven't found it on either Auto Zone's OR Advance Auto's websites.
They are both push-in 90 degree plastic pieces.
Here's a pic taken from Jayme's write-up.


in there help parts area where they have all kinds of parts , may not be on there page , but they have the coupler there .
i got one for 77 gmc where the heater hose comes out the intake here in murfreesboro tn .
you see there window cranks , exhaust springs , plugs , license plate screws
steering rag joints , etc ,,,

ok , just seen your had photo , there different , but they may still have it .
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Old 12-11-2009, 07:45 PM
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Those are not a big deal to change and any parts store should have it. It was a real common failure item. The replacement from GM is redesigned if I remember correctly. Different material.
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Old 12-11-2009, 08:01 PM
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These originals lasted 10 years, this thing was a government vehicle before I bought it in Feb of '03 and was owned locally since bought new in November '99.

10 years old and this is the only thing I would put it out of service to repair since I bought it, I don't count brakes, only changed pads and rotors all the way around once so far, and the rest has been insignificant.

I found a pair for what I considered pretty cheap at $7.99 for the pair, just in case I needed to order to have them sent in. I then went on a further Advance Auto website search and found them for almost HALF that price.

I'm gonna have the little lady stop in when passes them by on here way to or from work and get them for me to work on replacing.

Last edited by M&M CUSTOM; 12-11-2009 at 09:17 PM. Reason: ADDING INFO
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Old 12-13-2009, 02:57 PM
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I decided first thing in the morning on Saturday morning, I'm taking the wife to work and fixing this while she's there.

I went in to AA and they listed 10 in store on their website, 1 on their in-store computer, and had NONE on the shelves.

I went to Auto Zone, and had to yell at the counter jerk that I told ELBOWS to and he brought out a single rubber hose that didn't even apply to a 2000 Impala.

I luckily took the part number and cross reference numbers with me just in case I had to go in there, and gave him the cross reference number, he went off in search of it, and then came back requiring help from another employee who looked on the computer screen at WHERE it was supposed to be located in the store.

He still took 15 minutes AFTER the location listing to find it.

ANYHOW, I got home and tore into the project at hand, WITH the help of my 11 year old Troy.

I could have done the entire job myself and taken less time, but why not let him learn since he now has an S-10 project he still has yet to start on, and he learned a few things along the way just on this little job.

I took everything apart, removed the broken parts, and installed the new elbows and reassembled the tensioner pulley and heater hoses that attach to it, and progressivley let him do more and more after that. He did a pretty good job and learned a couple tricks to make certain wrenching tasks easier on him while he's working.

I could have used a couple power tools on this project, but this time around did the whole thing by hand. He had quite a time figuring out where a few things went, but I showed him how to identify where the part goes and how it's oriented, and he did good with that too. He also did a little mixing, adding and bleeding of the coolant system.

The pictures below are of the new and old elbows, the water pump and lower intake manifold holes these elbows fit into as well as the back of the bracket/ tensioner assembly, and my 11 year old Troy doing some wrenching.
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Old 08-05-2012, 10:12 PM
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Anyone Else with this issue.?

Quote:
Originally Posted by M&M CUSTOM View Post
I decided first thing in the morning on Saturday morning, I'm taking the wife to work and fixing this while she's there.

I went in to AA and they listed 10 in store on their website, 1 on their in-store computer, and had NONE on the shelves.

I went to Auto Zone, and had to yell at the counter jerk that I told ELBOWS to and he brought out a single rubber hose that didn't even apply to a 2000 Impala.

I luckily took the part number and cross reference numbers with me just in case I had to go in there, and gave him the cross reference number, he went off in search of it, and then came back requiring help from another employee who looked on the computer screen at WHERE it was supposed to be located in the store.

He still took 15 minutes AFTER the location listing to find it.

ANYHOW, I got home and tore into the project at hand, WITH the help of my 11 year old Troy.

I could have done the entire job myself and taken less time, but why not let him learn since he now has an S-10 project he still has yet to start on, and he learned a few things along the way just on this little job.

I took everything apart, removed the broken parts, and installed the new elbows and reassembled the tensioner pulley and heater hoses that attach to it, and progressivley let him do more and more after that. He did a pretty good job and learned a couple tricks to make certain wrenching tasks easier on him while he's working.

I could have used a couple power tools on this project, but this time around did the whole thing by hand. He had quite a time figuring out where a few things went, but I showed him how to identify where the part goes and how it's oriented, and he did good with that too. He also did a little mixing, adding and bleeding of the coolant system.

The pictures below are of the new and old elbows, the water pump and lower intake manifold holes these elbows fit into as well as the back of the bracket/ tensioner assembly, and my 11 year old Troy doing some wrenching.


I know the thread is old but this is a common failure.

You Should Always CHECK OR REPLACE YOUR RADIATOR CAP if one of these plastic fittings requires replacement.(you may as well do both when the one fails)

The OEM caps seem to fail and cause an high pressure condition.

I failed to check the cap and ended up doing one twice for a friend of mine.
Felt pretty bad about it.
worst yet is i did not replace the cap , i didn't think about it until after she already left. hopefully she listens and gets a new one before i end up doing it again.


Had a couple dealer mechs try to tell me it was due to an air bubble. "someones blowing bubbles"
The plastic part breaking apart because the cap fails to release At 16 psi makes more sense to me.

I have seen an old camaro blow a radiator seam because of the same type of cap failure.
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