GmanB Posted February 14, 2019 Report Share Posted February 14, 2019 So the other evening I got home from work and coolant was pouring out from under the car, just behind the seats, so water pump area (there was a minor clunk over pot holes right at the end of the journey). Had the car towed to a local garage and now the car is holding water, pressure and the temps are fine. Fan is also cutting in at the correct time. They took it for a 20 mile run and then left it idling for an hour. They've suggested a rad cap replacement. Is there anything else it could be? Thanks in advance. Link to comment Share on other sites More sharing options...
entdgc Posted February 14, 2019 Report Share Posted February 14, 2019 After reading the first part of your report I immediately thought water pump just the same as you seem to have done. But it seems odd that it should have 'repaired itself'! Dave Link to comment Share on other sites More sharing options...
Nobbie Posted February 14, 2019 Report Share Posted February 14, 2019 Maybe the thermostat stuck closed and the water jacket around the engine boiled causing the overflow through the pressure relief valve. Not sure where the dash temp display takes it's reading from, so not sure if it would show this rise. May just be a one off Link to comment Share on other sites More sharing options...
edc Posted February 14, 2019 Report Share Posted February 14, 2019 The best thing they could do is put it on a pressure tester. Link to comment Share on other sites More sharing options...
the baron Posted February 14, 2019 Report Share Posted February 14, 2019 4 hours ago, edc said: The best thing they could do is put it on a pressure tester. + 1 Link to comment Share on other sites More sharing options...
GmanB Posted February 15, 2019 Author Report Share Posted February 15, 2019 Yeah the pressure was fine they monitored it for an hour. Bit of a head scratch moment, will see how it goes over the next few days. Link to comment Share on other sites More sharing options...
charlieboy2608 Posted February 15, 2019 Report Share Posted February 15, 2019 Excuse my ignorance but I'm sure I read somewhere that by replacing an 00 cap with the 04 it can cause the overflow bottle to split because its pressure release setting is higher than the original hence there is greater pressure in the system? Link to comment Share on other sites More sharing options...
GmanB Posted February 25, 2019 Author Report Share Posted February 25, 2019 Minor update, 400 miles since the coolant and rad cap were replaced and working fine so far (I've probably jinxed it now). Link to comment Share on other sites More sharing options...
the baron Posted February 25, 2019 Report Share Posted February 25, 2019 On 2/15/2019 at 8:09 AM, charlieboy2608 said: Excuse my ignorance but I'm sure I read somewhere that by replacing an 00 cap with the 04 it can cause the overflow bottle to split because its pressure release setting is higher than the original hence there is greater pressure in the system? Yes, you are correct that happen to mine, although not straight away, was a gradual thing, and might not happen to everyone, depends on age of car Link to comment Share on other sites More sharing options...
S8ked Posted February 26, 2019 Report Share Posted February 26, 2019 Like the Baron, I also had my coolant tank fail shortly after replacing the 00 cap with an 04 cap. Link to comment Share on other sites More sharing options...
el 3.2S Posted February 26, 2019 Report Share Posted February 26, 2019 I had the same on my car too. Coolant tank split soon after changing to an 04 cap. Link to comment Share on other sites More sharing options...
charlieboy2608 Posted February 26, 2019 Report Share Posted February 26, 2019 Can I ask why are people changing to the later cap?-Have you had problems with the old cap or am I missing the point? New to ownership so please be gentle.... Link to comment Share on other sites More sharing options...
Eddy555 Posted February 26, 2019 Report Share Posted February 26, 2019 The earlier caps have a design fault that leads to the seal failing and causing coolant leaks. Caps with the part number that ends in 04 have this fixed. Link to comment Share on other sites More sharing options...
el 3.2S Posted February 26, 2019 Report Share Posted February 26, 2019 After replacement, the next weakest part in the system is often the old crusty coolant tank, it seems. Cap replacement cost me a fortune as also replaced thermostat, water pump, belt, coolant and tank, whilst in the zone. I kept costs to "minimum" by diy and purchase of aftermarket tank. Will see how wise that turns out to be........ Link to comment Share on other sites More sharing options...
NSS Posted February 26, 2019 Report Share Posted February 26, 2019 I had the same thing last week, dumped a approx 2 litres of coolant on the car park. Felt like fans hadnt kicked in. Topped up but only tap water as thats all I had so I could get home, no issues, temp sat as it should and fans front and engine kicked in as they should although I did put AC on to check the front fans. Having a coolant flush this week and check out but also scratching head. Link to comment Share on other sites More sharing options...
charlieboy2608 Posted February 26, 2019 Report Share Posted February 26, 2019 3 hours ago, Eddy555 said: The earlier caps have a design fault that leads to the seal failing and causing coolant leaks. Caps with the part number that ends in 04 have this fixed. My understanding is that the 04 cap also has a greater relief pressure hence it shows up other weaknesses in the original design........? Link to comment Share on other sites More sharing options...
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