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| Brown radiator overflow fluid - algae/rust??? https://www.auszookers.com/forum/viewtopic.php?f=5&t=13696 |
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| Author: | TheOtherLeft [ Wed Jul 21, 2010 4:15 am ] |
| Post subject: | Brown radiator overflow fluid - algae/rust??? |
I have a J20A engine and have found that fluid in the radiator overflow tank is a shade of brown, whilst the fluid in the radiator is still fluoro green. I've replaced the overflow fluid a few times and it still seems to go brown'ish after a week or so. It's been suggested that rust in the system could be the cause. As the block is alloy and the radiator is aluminium/plastic I'm not sure where it could rust from. Could it be algae growth in the overflow tank instead? |
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| Author: | lump_a_charcoal [ Wed Jul 21, 2010 5:10 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
rust in the bottle? |
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| Author: | TheOtherLeft [ Wed Jul 21, 2010 5:15 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
lump_a_charcoal wrote: rust in the bottle?
Rust in the cooling system which is then pumped into the overflow bottle. |
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| Author: | royce [ Wed Jul 21, 2010 5:28 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
Sediment in teh block rises and goes out the overflow for giggles get a 2l softdrink bottle and fill with clean water, stick it in the radiator filler with the engine warm and idling (dont burn yourself) and watch the crap that floats up |
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| Author: | lump_a_charcoal [ Wed Jul 21, 2010 5:32 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
TheOtherLeft wrote: lump_a_charcoal wrote: rust in the bottle? Rust in the cooling system which is then pumped into the overflow bottle. No I mean maybe there is rust powder in the bottle, which is turning the water brown. |
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| Author: | TheOtherLeft [ Wed Jul 21, 2010 5:34 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
Is the sediment worth worrying about? I flushed the radiator fluid about 1 year ago and the problems only really started about 6 months ago. |
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| Author: | TheOtherLeft [ Wed Jul 21, 2010 5:35 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
lump_a_charcoal wrote: TheOtherLeft wrote: lump_a_charcoal wrote: rust in the bottle? Rust in the cooling system which is then pumped into the overflow bottle. No I mean maybe there is rust powder in the bottle, which is turning the water brown. Don't think so. I've cleaned out the overflow bottle a few times and put clean water back in just to check. |
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| Author: | alien [ Wed Jul 21, 2010 6:10 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
i got mud in mine once cos i was submerged and the lid came off the overflow... lol - it was a one off event but took a year or so to get the crap out! |
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| Author: | dezook [ Wed Jul 21, 2010 6:50 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
Just flush it and instead of just putting water in it, Put coolant in it so algae can't grow in there. If it turns brown again than you know something weird is going on. If the water in the radiator is green than your overflow should be green unless you got mud in it 
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| Author: | atari4x4 [ Wed Jul 21, 2010 8:12 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
my J20a will discolour the coolant in radiator overflow bottle over a period of time also... it's very weird, the coolant in the radiator is hyper colour green like proper coolant but after a while the coolant in the bottle will go brownish. royce is onto something, the 2lt coke bottle full of water is a good way to pick up the gunk that floats in the system, i have a length of hose & coke bottle to assist in bleeding the air out when doing a coolant change & it will always have floaties in it even after fresh coolant. |
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| Author: | whincup [ Wed Jul 21, 2010 10:41 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
same problem here. proper green colour coolant is meant to be (or red, as my case was before i changed over) yet overflow bottle full of brown-green (brown-red) coolant. i just assumed algae or something. never thought of rust... stupidly enough. |
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| Author: | TheOtherLeft [ Thu Jul 22, 2010 12:11 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
dezook wrote: Just flush it and instead of just putting water in it, Put coolant in it so algae can't grow in there. If it turns brown again than you know something weird is going on. If the water in the radiator is green than your overflow should be green unless you got mud in it
As what's been happening with the other replies, I have green coolant in the rad except it goes green/brown in the over flow. Seems to be a common problem then. |
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| Author: | TheOtherLeft [ Thu Jul 22, 2010 12:12 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
atari4x4 wrote: royce is onto something, the 2lt coke bottle full of water is a good way to pick up the gunk that floats in the system, i have a length of hose & coke bottle to assist in bleeding the air out when doing a coolant change & it will always have floaties in it even after fresh coolant.
So where do the floaties come from, and what the hell is it??? |
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| Author: | royce [ Thu Jul 22, 2010 12:21 am ] |
| Post subject: | Re: Brown radiator overflow fluid - algae/rust??? |
you still get corrosion, bits flake off the inside of hoses, minerals in the water the block is cast using sand to form the water jackets, usually this sand is never 100% cleaned out and gradually breaks away from teh remaining clumps, some mid 80's falcons were that bad for it you could pull the welch plugs out and scoop it out and the radiators would be half full of it and so on |
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