cooling system keeps filling up with a thick brown rust?

1989 FORD F-150
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FARMBOY
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im having a cooling system issue, my cooling system keeps filling up with a thick brown rust and i mean thick you can spoon it like mud ive had to replace my rad,waterpump,serpenten belt ,my water pump locked up due to this stuff ive had it flushed 12 times its ok for 1 wk after flush then back to the mud again i use good antifreeze, rust prevent and lube and have even used distilled water to try to help it only has 63000 miles on it uses no oil, comp ok, small loose of water. ive even tried using a hotter thermostat and a cooler one any help will be appreciated since im out of ideas thank you
Jan 12, 2006 at 9:21 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Request identification of the recurring deposits and investigation of the coolant loss before another round of replacement parts. A reply proposed sample analysis, but no analysis result was posted.

Guidance references and applicability

Source: Original question and visible replies. Owner outcomes are attributed; other participants' experiences are not treated as this owner's repair. Next steps are editorial guidance, not a confirmed diagnosis.

Read the replies · Discussion summary and reported outcome

AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
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DUDE
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you sure someone dident put "stop leak " in the rad to get rid of a coolant leak ,It comes under various other trade names and will often give that symptom
If so it would require a thorough cleraning out of the entire system plus you would find the origional leak then
Jan 13, 2006 at 6:51 AM
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FARMBOY
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thanks for your responce ive owned the 89 ford since new i never added any stop leak it was power flushed 3 times before new rad was installed this has been a problem for 3 years at 49000 miles it got so bad i had to tear it down to rod out cooling passages this is 3rd rad 4th water pump all metals are compatable according to specs
Jan 13, 2006 at 8:02 AM
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DUDE
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:idea: what if you took a sample of the water to a lab and have them tell you whats in it , beats guessing.
Jan 13, 2006 at 8:35 PM

Discussion summary

cooling system keeps filling up with a thick brown rust?

An owner reported recurring thick brown deposits in a 1989 Ford's cooling system despite repeated flushing and radiator and water-pump replacement. The owner denied adding stop-leak and described a small coolant loss.

Reported outcome: No cause or lasting repair was established.

The material was described as rust but was not identified by testing. Prior ownership history and acceptable reported compression do not establish the source of the contamination.

Read the original discussion

AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
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