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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Coolant Overflow Tank

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Old Aug 31, 2025 | 01:40 PM
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88LX5.0H's Avatar
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Coolant Overflow Tank

The overflow tank on my ‘84 has cracked with age so I started looking for a replacement. LMC Truck, Bronco Graveyard, and Dennis Carpenter all showed them to be out of stock. I figured I would have to throw the 87-96 model tank in, however I stumbled upon this

https://lmr.com/item/LRS-17618/mustang-dcr-windshield-washer-fluid-reservoir-79-85

It’s a perfect fit. All mounting locations work with our trucks, only difference I saw in the tank is the windshield washer fluid side has a little cut out, which I assume is for clearance around something in the Mustang model. If you’re on a budget I’d honestly just go with the 87 + model as they’re half the price but if you want a stock replacement look this one is as good as it gets till the other companies get stock again.

When I was searching for the factory replacement I had seen old posts in here about not being able to get new ones. So if any newer posts have been made showing this already, I apologize for repeating the same info lol



 
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Old Aug 31, 2025 | 02:10 PM
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Good find. I'm wondering if you make a thread in the "how to" forum for your year truck. I know my 86 302EFI has a different tank, mine has the hose in the bottom.

But, it may be helpful to someone with the early years of these trucks in the future.
 
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Old Aug 31, 2025 | 03:58 PM
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Originally Posted by Max Capacity
Good find. I'm wondering if you make a thread in the "how to" forum for your year truck. I know my 86 302EFI has a different tank, mine has the hose in the bottom.

But, it may be helpful to someone with the early years of these trucks in the future.

yeah in my searching it shows that the 85/86 models have the tank from with the hose barb at the bottom. But all the reproduction places show this same tank for 80-86. Yours is a technically better tank with the hose on the bottom
 
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Old Sep 1, 2025 | 06:45 AM
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As long as the hose goes inside and drops to the bottom of the tank, it won't matter. It just needs to stay submerged in coolant at all times so it can suck it out of the tank when the engine cools.

The early original tanks were more of a "catch tank" and did not have the hose submerged. The later tanks were more of a official reservoir tank. But as long as the older tank's hose is extended into the bottom of the tank and it has the proper recovery radiator cap, it will work as a recovery tank.
 
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Old Sep 1, 2025 | 08:24 AM
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Originally Posted by Franklin2
As long as the hose goes inside and drops to the bottom of the tank, it won't matter. It just needs to stay submerged in coolant at all times so it can suck it out of the tank when the engine cools.

The early original tanks were more of a "catch tank" and did not have the hose submerged. The later tanks were more of a official reservoir tank. But as long as the older tank's hose is extended into the bottom of the tank and it has the proper recovery radiator cap, it will work as a recovery tank.
Yep that is what I have done to my tank, hose to the bottom and it dose pull coolant back into the radiator when it cools down.
Dave -----
 
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Old Sep 1, 2025 | 04:19 PM
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Originally Posted by Franklin2
The early original tanks were more of a "catch tank" and did not have the hose submerged. The later tanks were more of a official reservoir tank. But as long as the older tank's hose is extended into the bottom of the tank and it has the proper recovery radiator cap, it will work as a recovery tank.
My '84 has what I think you're calling the early style, just like the pictures in the first post (other than the broken corner). It has an opening in the top for the hose. The hose has an elbow, below which is a length of hose that reaches almost to the bottom. As far as I know, this hose was original from the factory. The hose is very thick-walled and almost rigid, not like the stuff you get from a roll at the parts store.

This arrangement definitely works as a recovery tank. I wonder if this was an intermediate "fix" before the factory switched to the newer style tank. The only opening is for the hose, maybe 5/8" or so. Unless using a tiny funnel, there's no way to top off the system at the tank.
 
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Old Sep 1, 2025 | 05:23 PM
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FWIW my Subarus for the past 26+ years have the hose going in the top of the tank.
it maybe just a packaging thing as both seem to work.
 
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