big mike Posted May 14, 2017 Report Share Posted May 14, 2017 Had car in last week to garage for service, oil leak repairs and knock in suspension which was a sore one but made it perfect, or so I thought, Had a little drive yesterday and when I stopped there was coolant coming out beside rear wheel, now I have already replaced the cap with upgraded so not that, On further inspection today I can hear a hiss beside the air valve/ bleed point which I'm presuming means the header tank is goosed, Can anyone give any advice if I'm looking in the correct/wrong area and also where the best place to buy from Link to comment Share on other sites More sharing options...
big mike Posted May 14, 2017 Author Report Share Posted May 14, 2017 Found tank on Euro car parts for 115, Link to comment Share on other sites More sharing options...
PaulQ Posted May 14, 2017 Report Share Posted May 14, 2017 I think the aftermarket ones are OK. The previous owner of my car did mine a few years ago now. Make sure it is that though, as apparantly its a bit of a job to swap them out. Link to comment Share on other sites More sharing options...
big mike Posted May 14, 2017 Author Report Share Posted May 14, 2017 Anything else it could be? Link to comment Share on other sites More sharing options...
chrishak Posted May 14, 2017 Report Share Posted May 14, 2017 The pressure relief valve beside the cap hasn't been left open, has it? Link to comment Share on other sites More sharing options...
big mike Posted May 14, 2017 Author Report Share Posted May 14, 2017 No,it's closed. The pressure leak appears to be beside the base of the pressure relief valve? Link to comment Share on other sites More sharing options...
PaulQ Posted May 14, 2017 Report Share Posted May 14, 2017 Are all the screws tight ? , there is an O ring under there. Have a read of this : http://986forum.com/forums/performance-technical-chat/28257-loosing-water-through-coolant-overflow.html Link to comment Share on other sites More sharing options...
Terryg Posted May 14, 2017 Report Share Posted May 14, 2017 Put my money on the tank, I had exactly the same thing after Revolution put the new style cap on mine, I wonder if they (new tanks) increase pressure? I'm sure someone knows the answer to that. Link to comment Share on other sites More sharing options...
chaz771 Posted May 14, 2017 Report Share Posted May 14, 2017 Give it a test with washing liquid in a spray bottle, be sure of what's amiss!, when mine went it was in the lower half, I would say the clear plastic is more prone to degrading. Link to comment Share on other sites More sharing options...
Terryg Posted May 14, 2017 Report Share Posted May 14, 2017 14 minutes ago, Terryg said: Put my money on the tank, I had exactly the same thing after Revolution put the new style cap on mine, I wonder if they (new tanks) increase pressure? I'm sure someone knows the answer to that. Sorry I meant new caps, seems coincidental that both went straight after new caps were fitted. Link to comment Share on other sites More sharing options...
Araf Posted May 14, 2017 Report Share Posted May 14, 2017 1 hour ago, Terryg said: Sorry I meant new caps, seems coincidental that both went straight after new caps were fitted. The spring in the old cap weakens allowing pressure to escape prematurely. If the system has a weak spot then that will be exploited by the water as soon as the system is again pressurised correctly (with the new cap). Link to comment Share on other sites More sharing options...
Jason986S Posted May 14, 2017 Report Share Posted May 14, 2017 New style cap part number ends 004. Less than £20. I swapped mine out last year. Link to comment Share on other sites More sharing options...
Terryg Posted May 14, 2017 Report Share Posted May 14, 2017 4 minutes ago, Araf said: The spring in the old cap weakens allowing pressure to escape prematurely. If the system has a weak spot then that will be exploited by the water as soon as the system is again pressurised correctly (with the new cap). That is what I suspected, I think that they should warn you about this when they fit the new cap, with me it happened on the drive back from Revolution and since I never asked for the new cap I think it would be nice to have been told. Link to comment Share on other sites More sharing options...
big mike Posted May 14, 2017 Author Report Share Posted May 14, 2017 I'm going to try the o rings first as it does appear to be there abouts it's leaking, would anyone have a link to where I can order please Link to comment Share on other sites More sharing options...
KT986 Posted September 18, 2017 Report Share Posted September 18, 2017 Have either a leak from the reservoir cap ( its blue and number ends in 0000) is this the "problem "one ? Also what is the best option replacement option for the reservoir ? OEM is circa £325 , aftermarket £125 - any experience as to which is better ? KT Link to comment Share on other sites More sharing options...
big mike Posted September 18, 2017 Author Report Share Posted September 18, 2017 I think that's the original cap bud, I used a genuine replacement tank, from memory around 250 ish to buy. Link to comment Share on other sites More sharing options...
KT986 Posted September 18, 2017 Report Share Posted September 18, 2017 This in the cap on mine - "lost" cira 1 litre in two weeks - part no is 996 106 447 00 presume this is the "dodgy" one ? will replace & see KT Link to comment Share on other sites More sharing options...
big mike Posted September 18, 2017 Author Report Share Posted September 18, 2017 2 minutes ago, KT986 said: This in the cap on mine - "lost" cira 1 litre in two weeks - part no is 996 106 447 00 presume this is the "dodgy" one ? will replace & see KT I will check as I might have a spare one bud Link to comment Share on other sites More sharing options...
KT986 Posted September 18, 2017 Report Share Posted September 18, 2017 cheers BM KT Link to comment Share on other sites More sharing options...
edc Posted September 18, 2017 Report Share Posted September 18, 2017 If cap has gone get one with the part number ending 04. Link to comment Share on other sites More sharing options...
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