Chevy Impala SS Forum banner
1 - 17 of 17 Posts

·
Premium Member
Joined
·
153 Posts
Discussion Starter · #1 ·
During a recent overhaul of my previously neglected cooling system, I replaced the following: All hoses, all clamps, restrictor and tee, tb bypass, replaced a freeze plug with a pinhole, a water pump that had about 5 ball bearings left, 160 t-stat, dual electric fan conversion, and coolant reservoir. I found, 2 weeks later that the brand new coolant reservoir was seeping at the seam at the front, driver side corner. I called up my friendly, local GMC dealership, and they ordered me a new one under defective part warranty. After 50 miles of driving with the warranty replacement, It's seeping through the seam AGAIN in the same spot!!! :mad: Apparently there was a bad run of these manufactured. Has anyone else gotten a defective one recently?
 

·
Premium Member
Joined
·
6,358 Posts
Apparently there was a bad run of these manufactured. Has anyone else gotten a defective one recently?
I vaguely remember something like this a couple or more years ago, not sure if it was before or after the crash.
there was a thread about new coolant tanks having problems, maybe hamilton chebby might know if thats been an issue.
I just installed a new tank this weekend too cwm2
 

·
Super Moderator
Joined
·
9,369 Posts
The issue with the new tanks was that there were dividers where there shouldn't have been, and so coolant was only in one half of the tank. It was pretty visually obvious.
 

·
Premium Member
Joined
·
153 Posts
Discussion Starter · #5 ·
Update

I put my 3rd new GM coolant reservoir on about 2 weeks ago, and, finally: No leaks!! After seeing the new one, and comparing it to the 2 failed ones, it was obvious why they were leaking, and what the manufacturer did to correct the problem. These tanks look like they are made by molding each half, then attaching the two halves to each other, by heating up the joint and melting them together somehow. The failed ones showed no external melting at the seam, and the new (non-leaker) one does have a fully melted together seam. I'm sure there is a name for this process, but I'm not very well versed in manufacturing processes of plastic vessels... I wish I had snapped some pics of the leakers.
 

·
Premium Member
Joined
·
6,358 Posts
Where can I purchase a new reservoir tank from?


Sent from my Autoguide iPhone app
mike @ hamilton chevy has them in stock and he is a forum supporter/vendor.
look in the feedback forum.
 

·
Registered
Joined
·
3,094 Posts

·
Premium Member
Joined
·
153 Posts
Discussion Starter · #12 ·
See post #4
That's actually not the problem I was describing. Mine was leaking at the seam, right below where the steam/throttle body hose enters the tank. Both of my new GM leakers were leaking at the same spot. Both had somewhat "open looking" seams, whereas the latest one did not. Neither of the leakers leaked a lot; just enough to leave coolant stains on the tank. I would've taken pictures, but my local GM dealer was kind enough to let me get new warranty parts before having the old ones in exchange, so I returned them as soon as possible.

The good tank has a noticeable bead of melted plastic around the outer seam, meaning that the sealing mechanism at the factory must have been heated up more, or more "glue" was used to correct the problem.
 

·
Registered
Joined
·
447 Posts
The issue with the new tanks was that there were dividers where there shouldn't have been, and so coolant was only in one half of the tank. It was pretty visually obvious.

Its 2021 and i just got this from Rockauto, same issue you just described.. unacceptable being its Acdelco....
197171
197174


My old one
197175
 

Attachments

·
Premium Member
Joined
·
1,394 Posts
Oh no. I hope my newly ordered GM Genuine Coolant tank resivour has the correct passages. Is GM Genuine the same as AC Delco from Rock Auto?
my GM one (box sticker dated 2020) has both passageways. I’m assuming you should be ok but certainly check yours when you get it
 
  • Like
Reactions: helpthe95
1 - 17 of 17 Posts
Top