9 replies to this topic

[camrocok]

I have searched for the answer to this question but not 100% sure I have the necessary information so apologies for asking again.

 

I have replaced the coolant with full flush three times in the last hundred miles.   The coolant immediately turns brown, presumably from rust in engine block.   Is this just something that I live with i.e. mucky coloured coolant or is there a magic potion I can add to cure the problem?

[minimans]

If you want it really clean you will need to strip out the radiator and get it boiled/rodded out and then flush the block with a good descaler. and include the heater matrix in that as well. If it doesn't get hot leave it alone!

[cal844]

Just run it, I do a flush whenever I change the water pump or if I need the engine out. I usually flush the full system With a garden hose, including the heater ( disconnect both heater hoses from engine and bottom hose, also disconnect the bottom hose from the water pump end, not the radiator end)

[minimans]

I forgot to say remove the thermostat to flush the block.................

[Spider]

It does sound like rust.

 

I would suggest draining all the coolant and flushing first with clean water several times.

 

Then do a (roughly) 50 / 50 mix of CLR and water (or even higher quantity of CLR) and running with that for at least a week. Flushing a few times and then going back to coolant.

 

https://www.amazon.c...r/dp/B00009EFEX

 

I have tried a number of commercial 'flushes' but I found none of these were any good.

[camrocok]

I have replaced the thermostat and not driven it a huge amount because still in state of restoration but it is not overheating

[richmondclassicsnorthwales]

There is a fluid on the market, Evans Auto Cool Waterless coolant, it's expensive, but it eliminates problems associated with cast iron / aluminium / copper components. It is £65.00 for 5 litres

[Spider]

There is a fluid on the market, Evans Auto Cool Waterless coolant, it's expensive, but it eliminates problems associated with cast iron / aluminium / copper components. It is £65.00 for 5 litres

 

I think this has come up on the forum previously.

 

This particular 'Coolant' is 100% Glycol. While it won't cause Corrosion or rusting in the System, however, it is a less than ideal Coolant.

 

I've read a few reports where classic car owners who have tried this and similar Coolants actually find the running temperature hotter than with water or mixed coolants.

[cal844]

There is a fluid on the market, Evans Auto Cool Waterless coolant, it's expensive, but it eliminates problems associated with cast iron / aluminium / copper components. It is £65.00 for 5 litres

 
I think this has come up on the forum previously.
 
This particular 'Coolant' is 100% Glycol. While it won't cause Corrosion or rusting in the System, however, it is a less than ideal Coolant.
 
I've read a few reports where classic car owners who have tried this and similar Coolants actually find the running temperature hotter than with water or mixed coolants.

Seen this too, not good

[Dusky]

Must say I'm not a fan of waterless coolant either. After spending a fair few quid ( well , euro.. ) on it for our clubman, just to see the cooling was even worse than before. Also not allowed on most tracks anymore.