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Old 07-20-2010, 11:09 PM   #1
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radiator fluid question

i just bought my first wrangler it is a 1995 yj i looked at the radiator fluid and it is a brown color any ideas whats wrong?
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Old 07-20-2010, 11:31 PM   #2
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Probably hasn't been changed in years. Just needs a good flushing and refill.

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Old 07-21-2010, 12:45 AM   #3
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Open up the cap and grab the lower hose and start pumping it. If you get some slimy stuff coming up, then the PO had a leak somewhere and used a sealant. Look at heater core and radiator and make sure there aren't any leaks. Otherwise, like whiteyj said, good flush will do
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Old 07-25-2010, 01:34 PM   #4
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Second the System Flush...

I believe Preston makes a "flush" and a "cleaner" which is a bigger container.

My suggestion is to dump your system...be environmentally responsible.

Remove your t-stat and reinstall the housing/house.

Remove the upper a lower hoses at the radiator.

Sticke a garden hose in your upper hose and let 'er rip...let fresh water circulate through your cooling system. Stand back because you won't believe the stuff that comes out. Turn your heat control selector to HOT while this insanity is going on...

You can flush the radiator with water by sticking the hose in the fill neck. Also check to see if the radiator core is corroding. If so you should replace.

Reconnect your hoses, dump the Prestone cleaner in and top off with water. Run the engine for a few minutes to ensure you bleed the air. Top off and leave your heater on.

Drive for 6 hours ... total not straight. When you're done, cool down, dump and dispose of the fluid being environmentally friendly

Install a new t-stat, fill with coolant, run the engine, wait for the t-stat to open, top off with coolant, replace the radiator cap and you're done.
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Old 07-25-2010, 01:55 PM   #5
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Listen to the nurse, she knows what she's talking about. That brown color is rust. Don't be surprised afterward if you get leaks from other places.

I bought a Ford truck and the coolant bottle had about an inch of rust in the bottom. The engine was loaded too. I flushed the entire system with the garden hose til rust stopped coming out. This took a while. I refilled the system with new coolant and drove it around front and parked it. The next morning I came out and the water pump had leaked all over. I guess the rust was keeping everything sealed.

That's no joke.
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