Tomas4x4 Posted August 12, 2010 Share Posted August 12, 2010 Howdy all, My 96 300tdi disco every now and then chucks out coolant from where the hoses meet the thermostat housing, but there all very tight.Ive recently changed the p gasket, replaced the thermostat and changed the coolant, all has been well until it started doing this for no apparant reason, when the engine is off and still warm, a hissing sound is coming from the coolant reservoir and does this for some time, I was wondering if perhaps the pressure cap is faulty and causing the water to overheat?? The engine temperature guage tells me its not overheating so im baffled.. Has anyone else experienced this or know a solution? As ever all suggestions will be much appreciated. Cheers. Tom. Quote Link to comment Share on other sites More sharing options...
dooroy Posted August 13, 2010 Share Posted August 13, 2010 What kind of hose clips are on those hoses - I have found that the spring type clips can do that , especially after they have been opened a few times . The cap could also be acting up a bit - but have you had any leaks from any other joints ? My Td5 was losing some coolant due to a failing gasket on the oil cooler ( which is not on the Tdi). I found that , with the engine at normal temp , if I loosened the cap until I just heard a faint hiss (escaping pressure) then I could go for a long time without having to top up . Quote Link to comment Share on other sites More sharing options...
Ratty43 Posted August 13, 2010 Share Posted August 13, 2010 I've had the same problem with corrosion on the alloy which prevents a smooth seal being formed. Quote Link to comment Share on other sites More sharing options...
Paul 200 TDI Posted August 13, 2010 Share Posted August 13, 2010 I've had the same problem with corrosion on the alloy which prevents a smooth seal being formed. Yes that, remove the rubber tube and check the condition of the thermostat out let pipe Quote Link to comment Share on other sites More sharing options...
Tomas4x4 Posted August 16, 2010 Author Share Posted August 16, 2010 Thanks for that guys, I will try it. Coolant can be seen to be leaking out of the three hoses attached to the thermostat housing and the top radiator hose as well as from the header tank cap, a bit worrying... Anyway I shall give it a blast, and for the price of a new header tak cap I may replace it. Cheers! Tom. Quote Link to comment Share on other sites More sharing options...
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