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All -

I am on my third OEM ford coolant reservoir.

  • OEM tank - 205k with no leaks, overhauled rest of coolant system so decided to replace as preventive MX - big mistake :damnit:damnit
  • 1st replacement tank - leaked at seams at 5k miles, installed with new motorcraft cap



  • 2nd replacement tank - leaked at seams at 10 miles (build date March 2017)



  • 3rd replacement tank - leaked at seams at 20 miles, (build date 7/20/17) - installed with another new motorcraft cap to be sure




Some googling reveals a few guys out there have tried 5 or 6 tanks until they found one that sealed. All of my replacements have had visibly poor mold lines and obvious low quality manufacturing. Visible gaps in the seams in multiple places, etc.

Dealer is playing nice with warranty exchanges, but i dont have time to drain and refill my coolant every 20 miles.

Aftermarket tanks are sticker shock at $400+.

General motor condition - 211k, runs great, preventive coolant flush/change at 205k to rotella ultra ELC, navistar pump, motorcraft tstat, ford hoses, ford radiator (small pinhole in original), ford tank, motorcraft cap. Runs correct temp, no smoke, steady coolant level (other than what leaks out of the seams).

Any ideas, recommendations, solutions? Keep plugging away until i find a good tank, or bite the bullet and go aluminum?
 

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I found a small seeping leak on the seam of my original 2002 F-350 coolant reservoir. I considered replacing but thought I'd try to repair It first. I used Gorilla instant glue gel formula along the problem area of the seam, and went a bit further than necessary just for good measure. It solved my problem. You might want to give it a try.
 

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Stuck in Commiefornia...
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1,298 Posts
Replaced mine with a Dorman bottle and Motorcraft cap two years ago. Zero issues.
 

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i think you can replace it for aluminum, but before installing the aluminum tank, you need to walk along the seams of the tank with special glue for aluminum to secure it and avoid holes and leaking. All visible gaps in the seams should be lubricated with glue. After that, you can safely install it .
 
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