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Generation 3 Pajero NM - NP Models 2000 - 2006

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  #1  
Old 31-03-18
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Default Rusty coolant

I just checked my oil and coolant levels. My coolant has turned from green to brown. It was green the last time I checked a month or two ago. I can also see rust flecks under the radiator cap. Just wondering why the coolant has turned brown and where this rust scale has come from?
The coolant is old so I plan to do a flush and renew the coolant.
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Old 01-04-18
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If it's that bad you might need to run some radiator flush through it. That might not be enough though - I don't know if the radiator places can clean the radiators these days as the OEM ones are plastic and you can't take the tanks off them - wouldn't hurt to enqiure thought.

The coolant is supposed to be replaced every so often - some products are 24 months and I think there is a Nulon coolant that is supposed to be ok for 5 year. Yours might have been in there too long.

Geoff
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Old 02-04-18
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Quote:
Originally Posted by GHendo View Post
If it's that bad you might need to run some radiator flush through it. That might not be enough though - I don't know if the radiator places can clean the radiators these days as the OEM ones are plastic and you can't take the tanks off them - wouldn't hurt to enqiure thought.

The coolant is supposed to be replaced every so often - some products are 24 months and I think there is a Nulon coolant that is supposed to be ok for 5 year. Yours might have been in there too long.

Geoff
Hi Geoff,
Yeah I was just surprised to see the coolant change colour so quickly and wondered if my water pump or radiator might be the cause of the rust scale. I am a little wary of using radiator flush (will have to do some research) but will change the coolant and keep an eye on it. Cheers
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Old 02-04-18
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Just drain the coolant, and fill up with tap water. Then continue to drain and refill daily with tap water until the water you drain out is clear (best if you can drive with the heater on in between too). It usually takes 3-5 cycles but is a good way to flush the cooling system without using acidic or alkaline flush).

Then fill with coolant and distilled water in the correct ratio (put the concrete in first then top up with water - so it a bit of ‘flush water remains in the block it doesn’t result in over dilute d coolant)
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  #5  
Old 02-04-18
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Quote:
Originally Posted by geopaj View Post
Just drain the coolant, and fill up with tap water. Then continue to drain and refill daily with tap water until the water you drain out is clear (best if you can drive with the heater on in between too). It usually takes 3-5 cycles but is a good way to flush the cooling system without using acidic or alkaline flush).

Then fill with coolant and distilled water in the correct ratio (put the concrete in first then top up with water - so it a bit of ‘flush water remains in the block it doesn’t result in over dilute d coolant)
Thanks Geopaj. I'll also put in some new top and bottom radiator hoses when I do the flush.
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Old 02-04-18
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Quote:
Originally Posted by geopaj View Post
put the concrete in first then top up with water
Concentrate maybe??
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  #7  
Old 02-04-18
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The concrete helps seal any leaks.
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Old 02-04-18
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Quote:
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Concentrate maybe??
You guys need a good poof reader....
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Old 02-04-18
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It's very odd that it changed colour so quickly. Maybe something is leaking into the coolant - oil/grease etc?
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Old 02-04-18
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Buy premix can't go wrong
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