Rusty water problem

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Jun 10, 2021 | 09:23 AM

Jim40216

Thread Starter

Junior User

Joined: Jul 2016

Posts: 94

Likes: 2

Rusty water problem

It seems like no matter how many times I flush out my radiator and block, the water is rusty in no time. Anyone found a solution for this? 1994 F-350 460 .

Jun 10, 2021 | 09:24 AM

ford390gashog

Fleet Owner

Joined: Jan 2004

Posts: 26,007

Likes: 575

From: Brentwood,CA

Flush with Motorcraft VC8. Make sure you are back flushing also with the lower radiator hose removed and no thermostat installed. Use the heater hoses as flush points to assist.

Jun 10, 2021 | 09:42 AM

SFaulken

Cargo Master

Joined: Nov 2009

Posts: 2,190

Likes: 620

I've generally always done a caustic flush, and then followed it up with calgon, then clean water. (I honestly can't say that I know that the calgon does anything, but it's a trick i picked up from an old Detroit mechanic, when I was working for a DDC dealer a number of years ago) All I know is that after that, I end up not having rusty crap coming out of the cooling system.

Jun 10, 2021 | 09:51 AM

timbersteel

Logistics Pro

Joined: Mar 2005

Posts: 4,698

Likes: 47

From: Mexico, Missouri

I've used vinegar and also Cascade in the past to clean the cooling system.

Jun 10, 2021 | 12:29 PM

torq'ta 5 8

Lead Driver

Joined: Jan 2019

Posts: 5,063

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From: N.W. Alabama

Question would be, what are you putting back in after flush out, you cant use tap water from sink or water hydrant, you need distilled water to flush out the flush out(LOL), then use 50/50 antifreeze, unless your getting 100% antifreeze, then use distilled water with it, to stop the rust.

Jun 10, 2021 | 05:12 PM

ZombieF150

Elder User

Joined: Sep 2018

Posts: 735

Likes: 8

From: NC

White vinegar and then flush with clean water, drain system and add proper mixture of coolant/water

Jun 11, 2021 | 03:40 PM

moose4x4

FTE Emeritus

Joined: Jan 2006

Posts: 2,288

Likes: 200

From: springfield Missouri area

I always put a bottle of this in after I flush or in new engine.

https://www.walmart.com/ip/GUNK-C101...11-Oz/26957613

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Jun 11, 2021 | 08:15 PM

TobyB

Laughing Gas

Joined: Oct 2014

Posts: 943

Likes: 184

From: Carnation, Wah

We all have our favorites, but I personally like Lube-Gard's Kool-it,
once you've flushed and flushed and flushed.

I run it with distilled water in the race car, and it REALLY
cleans out the aluminum radiator and head, and also the iron block.

So now I throw some into engines that are gungy, and it really
DOES seem to help.

I found it by accident when the RedLine was sold out-
but I kinda like it.

t
no affiliation