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Thread: Coolant leaking from the coolant tank A4 B6 1.9 TDI

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    Coolant leaking from the coolant tank A4 B6 1.9 TDI

    Hi Guys
    Audi A4 B6 1.9 TDI 130, AVF, 2004
    I've noticed coolant is leaking from the hole under the coolant tank, when ive been driving, it isnt loosing much at the moment, but when I open the bottle pressure comes out and the coolant rises.
    Ive have replaced the coolant tank with a new one, still leaking.
    I've also replaced the thermostat (genuine), temp sensor, because it wasnt sitting at 90, but is now.
    Earlier this week water pump failed, so got that replaced, even though it was replaced at 115k, 7 months ago.
    It is still leaking and the coolant has gone a bit dirty, ive had the sniff test done, and it didnt show any hydro carbons, and the colour didnt change and also pressure test on the coolant bottle and pressure was fine.
    Hope its not the head gasket, my friend said it could be the oil cooler.
    Any help or guidance would be appreciated.

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    I had the same problem and it was the HG, its one of the only ways to pressure rise the coolant system and water to be forced out of the coolant bottle, only other cause than I can think of is a cracked head.

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    How much did it cost?

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    Did the job myself, so was very cheap. Here is a post head with some estimate pricing 1.9TDi 115bhp - coolant loss - head gaskett / cylinder head

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    Just had the same symptoms with mine and it was the head gasket. Hopefully yours works out better than mine has so far

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    Head gasket failing.
    A4 Avant B6 1.9 TDI 130 Sport (6) Moro Pearl Blue, GMBH S Line Kit, Decat, 165bhp remap, EGR delete, K&N panel, Dunlop SP Sport Max, Full Leather, Cruise Control, Full DIS, Bose, Audi phone prep, Cooled Glove Box, Rear privacy glass, Rear parking assist.
    2003 Seat Ibiza 1.2 TSI FR in Lima green.

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    I just dont want to get it opened and have a cracked head.
    Is £300-£400 a good price to get the HG replaced? a mechanic said sometimes injectors fail when replacing the HG, ive also been told skimming the head isnt a good idea on a PD engine, is this true?

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    Did you replace the cap?
    BakPak likes this.
    Atlas Grey A4 2.5 TDI Quattro Sport.
    Mods so far: Cruise control, DIS, Heated Mirrors, Tuning box, Xenonx, Centre Arm Rest, MFSW, RNS-E, SDS and Aero Wipers.
    To do: None yet.
    Next: Auto dip rearview mirror and Folding Mirrors.

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    Yes i replaced it with my mates, ive noticed the pipe thats connects to the radiator goes really hard when ive been driving around. its building pressure, only way to let it out is to open the cap, and some air and more coolant comes out the hole from under the tank, and the pipe goes soft again.

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    Had very similar problem with mine, 1.9tdi 130 5 speed. After giving the coolant system a dose of K-Seal no problems since. Done approx 500 miles. Mark.

 

 

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