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Discussion Starter · #1 ·
Hi learned XF’ers… I’ve made a stupid mistake: in the dark and with a bad case of RSV impending, I added 150ml of green coolant to top up my 3.0D (MY12 model, 161,000km, well-maintained - until now!), and then drove home 10km before realising what I’d done, and immediately drained the whole lot (~10 litres).

What should I do, now that I have been bedridden for almost 10 days, with my XF sitting in my (warm) garage drained of coolant for all that time?

I know 150ml in 10,000ml is minuscule, but I’m well aware of the potential for sludge to form, and the fact that the coolant system is dry presumably means that some potential gunk has hardened.

I’m hoping to recover from RSV in the next few days, once i get the all-clear (it’s highly infectious, and I’ve never been more crook in my life - and yes, I’ve had COVID earlier). So after a period of about 14 days…

My current plan is to add coolant flush to 10 litres of demineralised water (we don’t call it ‘distilled’ in these parts) and run it until hot, then drain, fill with demineralised water again, run until hot once more, then if the then-flushed water is still clear, start again and add the required 50/50 mix of coolant/water via normal flush/fill procedures. Maybe two flushes are needed If the colour is still murky, though of course the water pump and heating system never completely lose coolant, so what should I expect?

Is this a good plan?

I did replace the expansion tank at the start, since the local dealer at some point had cracked the bleed valve through overtightening, which caused the leakage in the first place. Grrrr…
 

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I have the same 2012 Jag XF , i had the same cracked leaking tank , Got a new one , also got the coolant replaced, no flush all works fine , I live in a hot country and i used the anti freeze coolant , all works fine ..
 

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Discussion Starter · #3 ·
I’m confident that the replacement coolant will be fine, but it’s what’s remaining that bothers me. There is about 1-1.5 litres of badly mixed and potentially gummy coolant residue to consider. I’ll flush a few times, to be safe.
 

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Discussion Starter · #5 ·
Didn’t work out well in the end. Flushed and refilled, warmed up system, and now have steam rising from under coolant expansion tank somewhere, and near RH auxiliary radiator.

Off to the radiator specialist on Tuesday. Bummer.
 

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Discussion Starter · #7 ·
Thanks - good idea. I will go for a wee sprint when the sun rises and see if it does dissipate. had the same thought at 2:00am (as you do…) and considered that I had sprinkled a fair amount of water about in order to flush away any coolant residue. So it might be just pockets of water evaporating. But it was quite a cloud of steam, and persistent. I can’t see any sign of coolant leakage.
 
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Discussion Starter · #8 ·
Went for a test drive this morning. No steam after a good run. Hooray! Coolant temp hit 85°C, and coolant level needed only a slight topup when I got home. I’ll still take it to a specialist in a few days to have it checked over, and to ensure that nothing is amiss. Part of the problem in looking for leaks is that the undertray hides any obvious drips, and also the general plumbing around the engine.
 

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Went for a test drive this morning. No steam after a good run. Hooray! Coolant temp hit 85°C, and coolant level needed only a slight topup when I got home. I’ll still take it to a specialist in a few days to have it checked over, and to ensure that nothing is amiss. Part of the problem in looking for leaks is that the undertray hides any obvious drips, and also the general plumbing around the engine.
That is always an hidden feature with JAGS they tend to have some or the other leaks as i remember you have changed the top box for coolent it could be just small leak that got in the way when topping up , rest assured it should be fine now
 

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Discussion Starter · #10 ·
All good in the end. Specialist cooling shop declared pressure good, minimal air trapped, and temperatures normal. No leaks. They also said I did the right thing in a complete flush numerous times just to be safe. Steam was obviously residual moisture from my cleaning session.
 
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