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Citroen C6 2,7 HDI - Drain, change and flush coolant completely |
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cit-rotti
 
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  Member No: #3753
Location: Bayern |
Hello, I had to change my water/oil exchanger because it was leaking and about 1 1/2 litres of engine oil was being pressed into the cooling water. It is a C6 2.7 HDI 2008. I changed the water/oil exchanger with a new seal (located in the middle of the engine between the cylinder rows with the oil filter) and it looks OK. I was able to suck out most of the oil again, because oil always floats on top. But there is still some oil left in the cooling water. I would therefore like to drain off all the cooling water if possible and carry out several rinsing processes and also use a cleaning agent that dissolves oil. However, I can't find the right places to drain as much cooling water as possible or the places to flush the cooling and heating circuits with clear water under low pressure. The radiator cooler only has a connection "at the top" and a vent hole - there is supposed to be a drain plug at the bottom left - but I can't find it. There is also a drain plug on the engine block - I haven't found it yet either. Conveniently accessible would be the water connections on the water/oil exchanger of the gearbox - can these be used??? Does anyone have experience with this and can help me and tell me exactly where the drain plug on the engine block and radiator are. I would be grateful for any information - and if possible I would like to dismantle as little as possible. Greetings Wolfgang |
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MGmike
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   Member No: #3151
Location: South Queensferry |
Wolfgang, the radiator drain is at the bottom left as you look forward from under the engine. It looks like a screw head and is only a 1/4 turn to release. Do not attempt to turn further or remove it completely as you will break the retaining clip part that stays inside the radiator. Because of all the pipes etc. it is quite difficult to remove all of the fluid without removing a lot of components. Yes, use the gearbox oil cooler as one point but that will only drain one leg of the system. Draining the heater could be an issue and I would probably just do a number of flushes to get as much out as you can. Do not use any abrasive cleaning agent as this will damage the gearbox oil cooler. I have heard of people who have used a dish washer tablet as it cleans without foaming (much) but I'm wondering if it stays slightly abrasive in use. A liquid clothes washing detergent should be suitable as it does a great job of getting oil and grease off my overalls 
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cit-rotti
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Member No: #3753
Location: Bayern |
@MGMike thanks for the information I have reservations about using a dishwashing detergent or a laundry detergent because they dissolve grease well but attack aluminium. Therefore I will use a special industrial product for cleaning oily cooling water residues for car engines. Greetings Wolfgang |
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citroenroen1
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Member No: #5495
Location: Los Angeles |
Greetings, Where is the DRAIN plug located on the 2.7L HDI ENGINE BLOCK ? Is there a tutorial for draining and filling the coolant on the C6 2.7 HDI? What is the refill amount I will need : how many gallons of G30 (purple) are needed for the refill? |
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C6Dave
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  Member No: #1
Location: Northumberland |
citroenroen1 wrote ... Is there a tutorial for draining and filling the coolant on the C6 2.7 HDI? What is the refill amount I will need : how many gallons of G30 (purple) are needed for the refill? If you could have been bothered to look, there is a technical document on draining and refilling the coolant system: - Click Here - |
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citroenroen1
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Member No: #5495
Location: Los Angeles |
THANK YOU Dave. I will look for the drain plug on the engine block : "Remove the drain screw (1). Drain the cylinder block." I cannot yet figure put where the engine Block drain is ... How many gallons of G30 Coolant will I need to refill? |
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C6Dave
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Member No: #1
Location: Northumberland |
citroenroen1 wrote ... How many gallons of G30 Coolant will I need to refill? Capacity is circa 13.2 litres (total fluid) according to the tech doc: - Click Here - |
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speedfix
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 Member No: #1043
Location: south west |
Use antifreeze using distilled water, a small amount of soluble metal cutting oil coolant white water fluid, all helps against the internal cooling system corrosion and faults connected to electrolysis IMO due to the many types of metals present and other possible electrical faults. | ||
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canegnafu
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  Joined: Oct 24 2014 Member No: #1914
Location: Rome |
citroenroen1 wrote ... THANK YOU Dave. I will look for the drain plug on the engine block : "Remove the drain screw (1). Drain the cylinder block." I cannot yet figure put where the engine Block drain is ... Hi citroenroen1 eventually.....did you find the engine block drain? Max (from Rome, Italy) |
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citroenroen1
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Member No: #5495
Location: Los Angeles |
Hi Max, NO , I couldn't locate the engine block plug when I looked for it : the picture reference was a little vague to me and only a drawing , not a picture of the real thing. William |
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Duke_edward
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 Member No: #5625
Location: Schleswig-Holstein |
Please forgive me if the translation is not fluent, I am from Germany and the forum here is very helpful. I have looked at the technical document, but the points are too vague for me to find. Does anyone have some photos or can describe the points so that a dummy like me can find them. It would be very helpful as I am about to change the Cooland Intake Tank. The technical document on the thermostat housing was very helpful. Wilhelm |
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C6Dave
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Member No: #1
Location: Northumberland |
Duke_edward wrote ... Please forgive me if the translation is not fluent, .... It would be very helpful as I am about to change the Cooland Intake Tank. The technical document on the thermostat housing was very helpful. Is this what your looking for in tutorials? Google thinks: Ist es das, was Sie in Tutorials suchen? - Click Here - |
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Duke_edward
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Member No: #5625
Location: Schleswig-Holstein |
Sorry Dave, I expressed myself in a confusing way. I am familiar with this document. Also the document about filling with coolant. What I cannot find are the points where I can drain the water or bleed the air during filling. |
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MGmike
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Member No: #3151
Location: South Queensferry |
If you're changing the inlet tank you don't need to worry about draining the block as the tank is at the lowest point. Drain the radiator from the drain screw at the bottom LHS. However, draining all the coolant pipes and the heater is a little more difficult! Disconnecting the heater pipe at the junction above the gearbox should get most of it out and removing a pipe from the g'box oil cooler will get a bit more. There are a couple of bleed screws for refilling, one in the heater pipes as they go through the bulkhead and one at the back of the engine in the EGR pipework near the oil filler cap. TBH these can be a bit fragile and I tend not to use them as the system is not bad at refilling itself! I tend to fill and keep filling as the engine runs until the thermostat opens. It will burb more air out after a few cycles and a top up of a litre or two is usually needed the following day. |
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C6Dave
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Member No: #1
Location: Northumberland |
Duke_edward wrote ... What I cannot find are the points where I can drain the water or bleed the air during filling. The coolant 'bleeding' points are shown in this Citroën tech doc - Click Here - but I would follow Mikes advice personally. |
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