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Post by fortnum1977 on Apr 2, 2007 13:44:15 GMT
Hello,
wondered if anyone knows what to put in the radiator of a P5b coupe??
fortnum
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Post by harvey on Apr 2, 2007 15:18:10 GMT
Are you draining the system and re-filling it, or just looking to top up?
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Post by Phil Nottingham on Apr 2, 2007 18:27:52 GMT
Either way its should be a good quality Glycol based antifreeze mixture of at least 33% or more concentration. If you do not not what is in it or how old it is replace the lot and flush the system out per the book
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Post by harvey on Apr 2, 2007 18:53:13 GMT
Ethylene Glycol based antifreezes are being phased out in favour of organic types so if you're doing a drain/refil use organic to ensure future supplies. If you really want to do it properly use a 50/50 mix of organic A/F and distilled water and add a corrosion inhibitor. Then keep some of the mix for topping up.
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Post by fortnum1977 on Apr 3, 2007 8:54:21 GMT
i was just going to top it up because when I checked it one day it looked low.
However, after driving I found that it was very high...
My dad topped it up with a mix a mechanic made for his cheverolet a few weeks ago — an aluminium engine, too.
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Post by DanielSheard on Apr 3, 2007 8:55:39 GMT
?? I was under the impression that the OAT antifreeze (the pink stuff used in my Rover 75) are glycol based. I thought the OAT referred specifically to the corrosion inhibitors, not the antifreeze per se. Am I wrong?
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Deleted
Deleted Member
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Post by Deleted on Apr 3, 2007 14:37:17 GMT
Do NOT mix ethylene glycol antifreeze withthe new fangled organic stuff. It can turn into a jelly like substance and clog the radiator and heater matrix. You have been warned.
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Post by Phil Nottingham on Apr 3, 2007 18:23:03 GMT
Also do not be tempted to run for long on old/diluted antifreeze - this leads to a poorly conductive layer of corrsion in the aluminium watwerways of block and manifold which only acid based descaler products will then remove. This is another cause of overhtaing troubles on these engines
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Post by lagain on Apr 3, 2007 19:53:01 GMT
Never use 'ready diluted' mixes, as often it is not possible to get the correct concentration. I usually drain then fill with distilled water collected from my dehumidifier, then run until the thermostat opens and then drain again. I do this 3 times until the water that comes out is nearly clear. Then put in the required amount of antifreeze, I now do 50 per cent, and top up with distilled, or soft, water. I have now used Halfords 5 year, although I will not leave it in for that long
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