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Old 11th October 2019, 11:42   #1
Mr Toad
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Default coolant leak KV6

Hi All,

I can't remember when I last posted about this problem and thus can't find the thread. However, I still have the problem of a coolant leak which I cannot find. I have checked everything there is no exterior leak. I borrowed a pump for the cooling system pumped it up to 14lbs and the needle remained rock steady. After travelling about 70-80 miles I have had to put in about 350ccs of coolant. The car is performing ok and I got a mechanic who I know to have a quick look and his view was that it was not HGF, but where on earth is the coolant going. I am nearly at the end of my tether with this problem and after nearly a year! In spite of what my mechanic and Simon said on this forum I still think that it must be HGF I don't think it can be anything else, can it? Any bright ideas please.

Martin
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Old 11th October 2019, 11:52   #2
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Martin,

23rd September was your last post on the subject of coolant loss.

If you select 'view public profile' under your user name to the left of your message, choose the 'statistics' tab, then 'Find all posts by Mr Toad' you will get a list of all of them.

Simon
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Old 11th October 2019, 12:21   #3
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If i was suspecting HGF - albeit on my 1.8t - i would be looking for the following

1. Brown mayo on the dipstick

2. Brown mayo under the oil filler cap

3. Pressure escaping from a cold system - ie after a good thrash - say 10-15 miles at motorway speed - leave till next day and open expansion tank cap - if there is a loud sound of escaping gas then that points to exhaust fumes in the cooling system and points toward HGF

Did your mechanic do the chemical CO2 test on the coolant - not sure if it gives false positives - but it sems to be in widespread use to identify exhaust gases in the coolant.
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Old 11th October 2019, 12:26   #4
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Quote:
Originally Posted by Mr Toad View Post
Hi All,

I can't remember when I last posted about this problem and thus can't find the thread. However, I still have the problem of a coolant leak which I cannot find. I have checked everything there is no exterior leak. I borrowed a pump for the cooling system pumped it up to 14lbs and the needle remained rock steady. After travelling about 70-80 miles I have had to put in about 350ccs of coolant. The car is performing ok and I got a mechanic who I know to have a quick look and his view was that it was not HGF, but where on earth is the coolant going. I am nearly at the end of my tether with this problem and after nearly a year! In spite of what my mechanic and Simon said on this forum I still think that it must be HGF I don't think it can be anything else, can it? Any bright ideas please.

Martin
I had a similar situation, kept having to top up the coolant for a very long time even got my mechanic do a pressure test and found no leaks. Turned out to be air in the system and only worked its self out by months of topping up the system.
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Old 11th October 2019, 16:16   #5
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Quote:
Originally Posted by Mr Toad View Post
Hi All,

I can't remember when I last posted about this problem and thus can't find the thread. However, I still have the problem of a coolant leak which I cannot find. I have checked everything there is no exterior leak. I borrowed a pump for the cooling system pumped it up to 14lbs and the needle remained rock steady. After travelling about 70-80 miles I have had to put in about 350ccs of coolant. The car is performing ok and I got a mechanic who I know to have a quick look and his view was that it was not HGF, but where on earth is the coolant going. I am nearly at the end of my tether with this problem and after nearly a year! In spite of what my mechanic and Simon said on this forum I still think that it must be HGF I don't think it can be anything else, can it? Any bright ideas please.

Martin
I had the same issue on and off for 2 years and even drove the car to the Pyrenes and back twice in that time. I was stumped and thought HGF but could not find the leak. Eventually one morning while refilling the header tank the water started to come out at the back of the motor as fast as I was putting it in. Unfortunately for me it was on my 3rd trip to the Pyrenees when this happened. It turned out to be the water pump had failed and this cost me my first born child to fix but as the car had only done 76000m it was due for new timing belts anyway so the pump and belts and tensioners where done as well as new covers.
So my suggestion is water pump.

Hope that helps.

Last edited by Gunnerhavesome; 11th October 2019 at 16:18..
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Old 9th January 2020, 17:23   #6
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Default Coolant leak

Hi All,

Happy New Year everyone

I'm afraid I still have the coolant leak. There has been no real change so it looks like the heads are going to have to be removed.

However, I was speaking to a garage proprietor today and he gave me a product called "Rad Fix". He says it is non clogging and he has used it many times with good results. The product is not generally on the market it is supplied to garages and large transport organisations apparently.

It is made by a company called Tough Technology Products and I have spoken to them and they confirm that the product is not like all the other products on the market but they obviously could not guarantee that it will work but they said it can be easily flushed out if it doesn't.

Anybody had any experience of this product as I am very tempted to give it a try.

Martin
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Old 9th January 2020, 19:46   #7
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Firstly 2 things to bear in mind - HGF on the V6 is a rare event and any sealant is viewed by many as the devils device - causes more problems in the long run than it solves. The line of thought is find the leak.

Does the car still run OK ? Could it be the Inlet Manifold Gasket - i had this on a 1.8t and the leak was small .
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Old 9th January 2020, 22:49   #8
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The car runs perfectly and in a previous thread I explained that I have replaced the inlet manifold gaskets TWICE to eliminate that source of the leak.

For the life of me I cannot find any leak I doubt that I can spend any more time trying to find it.

I now have to make a decision either to add the Rad-Fix or take the heads off. As they say the stuff is non clogging it may be worth giving it a try. They say it can be flushed out if it doesn't!

Anyone else got any views please?

Martin
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Old 9th January 2020, 22:53   #9
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You may not find the leak even after fitting new head gaskets, a local member has the same problem, water level dropping randomly, he has had the head gaskets replaced by a reputable garage, I have changed the stat and the inlet gaskets, its had a new oil cooler and I cannot locate the issue!
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Old 10th January 2020, 09:21   #10
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Quote:
Originally Posted by Mr Toad View Post
I now have to make a decision either to add the Rad-Fix or take the heads off.
Martin; if Rad-Fix is "non clogging" and "can be flushed out" then how can it seal a leak in the long term? Think about it.
The second point about products like that is that they do not eliminate the problem, they "paper over the cracks".
The third point is that they're designed for completely non-technical owners which you clearly are not.

Removing the heads will be a waste of time and a lot of money. You will not have head gasket failure on a KV6.

Have you ensured that the two plastic clips on the straight pipe in the 'V' are both pushed fully outwards so that they are in close contact with the water pump and thermostat housings? A small leak in the 'V' can evaporate leaving little trace.

Renewing the flattened 'O' ring seals on my original expansion tank cap made a big difference. Have you done that?

Simon
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