How to drain my engine coolant using siphon or simple method

Questions specifically about a Diesel powered C3 (usually engine or fuel related problems)
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Diesel engine related problems
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My Name: Moh

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My car is a Citroen C3 Sx Hdi 70 1398cc Automatic Diesel (54 Reg) Sensodrive

I want to know how to change the engine coolant. I want drain the reservoir without getting under the car.
My anti-freeze was blue (I had some work done on my engine injectors) and now has turned kind of black/brown and blue.

I want to drain the old water and replace with clean anti-freeze. I have heard of the siphon method but don't understand it.

I can't seem to find the radiator drain plug/valve.

If anyone has pictures or videos I would appreciate it.
My Name: RC3D

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Posts: 40
Joined: Thu Mar 14, 2013 5:42 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (02)
Engine Size: 1.4 (8v)
Fuel Type: Diesel
Mileage: 140000
Trim Level: Rhythm
Gearbox: Manual 5 speed
DPF: No
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I have a different car my drain plug is on the back of the engine block, it's a rubber plug (no 4 below) held in by a metal circular clip (no 6 below), you have to put the top of the screwdriver into the clip and lift it then you can remove the plug. But expect coolant to spew out and get all over the subframe etc. You do need to get under the car to access this plug. This will empty the coolant which is inside the engine compartment.
water pump.jpg
But in your case I would just pull out the bottom radiator pipe (no 2 below), usually a metal clip holding it, with a pair of pliers you can remove it, then drain it into a bowl, again you have to get under the car. If you are doing this don't open the expansion tank top until the water has stopped gushing out. Make sure the car is cool before doing this though.
hose cooling.jpg
Radiator.jpg
I can't seem to find the radiator drain plug/valve.

If anyone has pictures or videos I would appreciate it.
If you PM me your vin number, i'll get you the diagram.
My Name: Moh

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Dear RC3D

Thank you very much for the pictures. I will try the method by removing the pipe via number 2 in diagram this weekend.
I will drain the antifreeze and fill with new antifreeze and distilled water.

Once again thank you very much.

I think the mechanic did something when working on my injector he did remove the air filter and many pipes.
Thank you for the lovely simple pictures.

Moh
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My Name: C3driver52

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Posts: 1938
Joined: Sat Apr 30, 2011 7:40 pm
Model: C3 2002-2005, Original shape model
Year: 2003 (03)
Engine Size: 1.4 i
Fuel Type: Petrol
Mileage: 79984
Trim Level: VTR+
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: TU3 (75 PS)
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Hi Moh, it would also be worth reading this post about the special antifreeze required for a citroen C3 - OAT Antifreeze for a C3 because the coolant should never be blue.
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