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Old 11-02-2010, 04:45 AM
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H2_recoveryteam's Avatar
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Location: socal
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Frustration setting in.....

I have a newly rebuilt 2.5L in my YJ and it has a new radiator, water pump, top and bottom hoses and temp sending unit and temp sensor. And i have now flushed the system with new coolant and water 3 times and after every flush i drive it for the day and the damn coolant looks like rust colored Sh$t. My question is why? And how the heck can I get the system clean?

Everytime i flushed it i ran the hose from the top of the rad to drain out the botom. Then i sprayed the hose in the top of the T-stat housing out the bottom of the water pump. I did both all 3 times till the water ran clear while running and while sitting. The jeep runs great and doesnt get hot, and when i pull the rad cap while running i have good circulation and flow. So should i just let it be and forget it? Is it common?

Im at last end and im tired of buying coolant. Plz any advice or thoughts. Thanks.

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Old 11-02-2010, 05:29 AM   #2
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Location: South Carolina
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A buddy of mine had the same problem. He used ER cooling system cleaner and it took care of it. Its a rust remover. Link below.........

ER Cooling System Cleaner and Rust Remover

87 YJ 4.2 Automatic
8.5" lift 35x12.50 Baja Claws
Home made, not Daddy paid...............
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Old 11-02-2010, 02:25 PM
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Cool thanks i might have to give that a try.
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Old 11-02-2010, 07:40 PM   #4
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The only real way to get all that crap out of there is to pull the engine apart and have it hot tanked. Since that's not an option 99.9% of the time just flush it out as best you can with the chemical flush products and live with it.
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