Stuart. B Posted June 19, 2021 Share Posted June 19, 2021 Hi there, I'm new to this club and I'm hoping I can get some much needed help and info. I've got a 2007 A3 2.0tdi 170 and I've recently had a cooling problem. I'm loosing coolant from my expansion bottle I think as I can hear it dripping onto the manifold after I drive it. Its in the garage atm and they have checked the egr valve and it's not that, the garage is baffled aswell as my self. Has anyone any idea of the problem. Thank you for any info. Quote Link to comment Share on other sites More sharing options...
cliffcoggin Posted June 19, 2021 Share Posted June 19, 2021 Stuart. You wrote that you can hear the leak dripping, but have you actually looked? Where specifically is it leaking from at the expansion tank? The cap, the hose connection, a hole in the side, somewhere else? Quote Link to comment Share on other sites More sharing options...
audia4b5kev Posted June 19, 2021 Share Posted June 19, 2021 air con dumps water to after run kev Quote Link to comment Share on other sites More sharing options...
Stuart. B Posted June 21, 2021 Author Share Posted June 21, 2021 On 6/19/2021 at 5:42 PM, cliffcoggin said: Stuart. You wrote that you can hear the leak dripping, but have you actually looked? Where specifically is it leaking from at the expansion tank? The cap, the hose connection, a hole in the side, somewhere else? Garage say its coming from the expansion bottle cap when under pressure but they have put 2 new caps on and a new bottle and still having the water leak problem Quote Link to comment Share on other sites More sharing options...
cliffcoggin Posted June 21, 2021 Share Posted June 21, 2021 That suggests that excessive pressure is being generated. My guess for the cause would be a leak at the cylinder head gasket or a restriction in coolant flow leading to boiling. Quote Link to comment Share on other sites More sharing options...
audia4b5kev Posted June 21, 2021 Share Posted June 21, 2021 head gasket yes that to water pump to Quote Link to comment Share on other sites More sharing options...
Magnet Posted June 21, 2021 Share Posted June 21, 2021 Hello Stuart, If this were mine, I would not be jumping to conclusions, but getting the necessary simple checks done to confirm or refute the assumptions. Can I suggest you first get your garage to carryout a pressure measurement on the coolant pressure when the engine is up to temperature. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
cliffcoggin Posted June 21, 2021 Share Posted June 21, 2021 1 hour ago, Magnet said: Can I suggest you first get your garage to carryout a pressure measurement on the coolant pressure when the engine is up to temperature. Agreed. I would have expected Stuart's garage to suggest it as the next step. Quote Link to comment Share on other sites More sharing options...
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