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Pressure cap blow off!!
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- Senior Member
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- Location: Plymouth
Pressure cap blow off!!
Hi all,
Well, dragged the car out for a spin today, popped into town to get a pressie for Kat then over to a garden centre to pick up a plant for her. On the way back I smelt a distinct 'puff' of hot coolant!!.
'Someones got a water leak' I thought, seconds later a gong and orange low water lamp!!!
Only a mile from home so nursed her back, no red lights or overheat warnings, oil temp steady and hot air coming from heater vents (always a good way to check).
Pulled up and could see steam emanating from the front of the bonnet drivers side, opened bonnet and pressure cap is sat on top of the rocker cover!! and coolant boiling and hissing all over the place.
Topped her up, took 2 1/2 boiled kettles, ran the coolant prime process and now shes stood outside 'cooling down' so I can check the level cold.
So, whats the chance of that happeing I wonder, you might all want to check your coolant tank caps are clicked all the way on, nice and tight......
Well, dragged the car out for a spin today, popped into town to get a pressie for Kat then over to a garden centre to pick up a plant for her. On the way back I smelt a distinct 'puff' of hot coolant!!.
'Someones got a water leak' I thought, seconds later a gong and orange low water lamp!!!
Only a mile from home so nursed her back, no red lights or overheat warnings, oil temp steady and hot air coming from heater vents (always a good way to check).
Pulled up and could see steam emanating from the front of the bonnet drivers side, opened bonnet and pressure cap is sat on top of the rocker cover!! and coolant boiling and hissing all over the place.
Topped her up, took 2 1/2 boiled kettles, ran the coolant prime process and now shes stood outside 'cooling down' so I can check the level cold.
So, whats the chance of that happeing I wonder, you might all want to check your coolant tank caps are clicked all the way on, nice and tight......
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
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- Member
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Pressure cap blow off!!
Holy sh!t……..I’ll give mine a look this weekend…hope she’s ok..
E89 20i SDrive M Sport mineral grey
Golf R-line Atlantic blue
VW Caddy..... Yep.. Its white
Golf R-line Atlantic blue
VW Caddy..... Yep.. Its white
- B21
- Lifer
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Pressure cap blow off!!
Very unusual
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is
A very modified Atacama Yellow 35is
- RobbiZ4
- Senior Member
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Pressure cap blow off!!
Hmm, very interesting.
Just today I replaced my cap by a new one, as the old one had several traces of broken material.
White/Blue traces of water blown out: Several broken parts, inner o-ring lost: Old cap on the left, new one on the right: Yes, 10 year old caps should be checked or better replaced in advance. I will put this as an additional task into my recommendations.
E89: Retractable Hardtop (roof) Maintenance (and additional) tasks
viewtopic.php?t=130932
Just today I replaced my cap by a new one, as the old one had several traces of broken material.
White/Blue traces of water blown out: Several broken parts, inner o-ring lost: Old cap on the left, new one on the right: Yes, 10 year old caps should be checked or better replaced in advance. I will put this as an additional task into my recommendations.
E89: Retractable Hardtop (roof) Maintenance (and additional) tasks
viewtopic.php?t=130932
Last edited by RobbiZ4 on Fri Aug 12, 2022 7:40 pm, edited 2 times in total.
Pardon, je suis Allemand
E89 Roof Maintenance
viewtopic.php?t=130932
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
E89 Roof Maintenance
viewtopic.php?t=130932
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
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- Senior Member
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- Joined: Fri May 26, 2017 3:40 pm
- Location: Plymouth
Pressure cap blow off!!
Yeah i need to check my seals, no obvious marking on the top of the header tank though.
Thanks for taking the time to post the pics, i appreciate that
Thanks for taking the time to post the pics, i appreciate that
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
- RobbiZ4
- Senior Member
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- Location: Munich
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Pressure cap blow off!!
The brand new cap has in total 3 o-rings mounted.
Pardon, je suis Allemand
E89 Roof Maintenance
viewtopic.php?t=130932
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
E89 Roof Maintenance
viewtopic.php?t=130932
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
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- Senior Member
- Posts: 2552
- Joined: Fri May 26, 2017 3:40 pm
- Location: Plymouth
Pressure cap blow off!!
How much Robbi, and is your car a 35i?
Mark
Plymouth
E89
35i
Carmine Red
Black leather
Plymouth
E89
35i
Carmine Red
Black leather
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- Member
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Pressure cap blow off!!
Is a very common problem on E46's and i've replaced a few caps with newer better ones, and also changed bleed screws for brass ones. Obviously any older car needs the whole cooling system going through at some point.
______________________
2003 3.0i in Toledo Blue - for sale
2003 3.0i in Toledo Blue - for sale
- RobbiZ4
- Senior Member
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- Location: Munich
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Pressure cap blow off!!
N52 30i, 23€ today in Berlin
But I assume it's model independent, rather age dependent.
Pardon, je suis Allemand
E89 Roof Maintenance
viewtopic.php?t=130932
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
E89 Roof Maintenance
viewtopic.php?t=130932
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
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- Senior Member
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- Joined: Sun Nov 20, 2016 2:49 am
Pressure cap blow off!!
In 70,000 miles, my engine's used between 4 and 5 litres of Comma Extream G48 coolant. The 'floating prong' is a clever level indicator and makes the coolant level easy to check. That said, I noticed from the beginning that the cap didn't close tight, but assumed it tightened as it heated. I've never tried it to find out because there have been no sign of leakage or excess use.
It is noticeable in your 2nd photo, RobbiZ4, that the prong isn't central and this corresponds to the white marks on the inside of the cap. Seating the prong centrally under the cap is a bit fiddly. Is it possible that, once upon a time, yours wasn't central, was caught between the O-ring and its rim and coolant escaped? Or something like that?
p.s. Presumably, you've drained the system of kettle water by now and re-filled it with an equivalent of G48, have you?
It is noticeable in your 2nd photo, RobbiZ4, that the prong isn't central and this corresponds to the white marks on the inside of the cap. Seating the prong centrally under the cap is a bit fiddly. Is it possible that, once upon a time, yours wasn't central, was caught between the O-ring and its rim and coolant escaped? Or something like that?
p.s. Presumably, you've drained the system of kettle water by now and re-filled it with an equivalent of G48, have you?
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