coolant looks like brown sludge - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 05-20-2018, 07:00 PM Thread Starter
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coolant looks like brown sludge

Changing my 750's coolant today I looked at it the other day and saw it looked bad but maybe its that HOAT coolant like zerex. Flushing with distilled and then refilling with Preston Honda coolant. And ideas on the sludge?
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post #2 of 9 (permalink) Old 05-20-2018, 07:02 PM Thread Starter
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Radiator cap
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post #3 of 9 (permalink) Old 05-20-2018, 07:14 PM
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Looks like Deathcool sludge from using Dexcool.

It used to be recommended for our bike, and you can still see it recommended in the Verses here, but it's the worst possible coolant you can choose.

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post #4 of 9 (permalink) Old 05-20-2018, 07:35 PM Thread Starter
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How do you get it to flush? I undid the bolt on the bottom and it won't come out. I just ran the bike to temp and still no go I'm surprised the bike didnt have heating problems.
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post #5 of 9 (permalink) Old 05-20-2018, 07:44 PM
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Quote:
Originally Posted by 1stVulcan750 View Post
How do you get it to flush? I undid the bolt on the bottom and it won't come out. I just ran the bike to temp and still no go I'm surprised the bike didnt have heating problems.

Not sure really, have been looking into because the SUV I just bought has it. The radiator cap looks worse than yours.

I've seen some pretty stout chemicals suggested, but I may try white vinegar then Cascade dishwasher powder in alternating flushes. Run a while until good and hot, probably drive it around, flush, rinse, repeat.

Most flush products you can buy have been weakened, the chemicals that worked best were taken out.

There's some type of citrus product I've seen mentioned, but I don't know where to get it.

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post #6 of 9 (permalink) Old 05-20-2018, 08:09 PM Thread Starter
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I pulled the cap off slowly while still hot and it started flowing here's the first of it going to flush it with distilled 2 or 3 times also tad bit of oil was already in my pan .
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post #7 of 9 (permalink) Old 05-20-2018, 09:34 PM
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That first picture was your overflow bottle wasn't it? Best way to clean one of those is to take it off the bike, fill it with crushed ice, and shake the bejezus out of it! That'll work loose whatever kinda sludge you got in there.

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post #8 of 9 (permalink) Old 05-20-2018, 10:15 PM Thread Starter
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Got it running clear took 3 runs of distilled. Also rinsed out the reserve/over flow tank. Found out the tank was busted at the very top but its still usable and surprisingly easy to remove just one bolt and some wiggling.
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post #9 of 9 (permalink) Old 05-20-2018, 10:20 PM Thread Starter
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GDI wish I had read that suggestion. I ended up filling with distilled. Capping it then shaking it while plugging the two hose connections with my thumb and index. probably looked like an idiot to my neighbors.😎
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