mk2 vrs on a 62 plate @140k

 

recently had the HG replaced as was blowing cold air when warm, bubbles in the radiator and failed sniffer test. etc. cars running great now, apart from it loses a little bit of water every 1000 miles or so.

 

thought it might be the radiator cap as no puddles on the floor or anything. so ordered the blue one from europarts and fitted it yesterday after getting in from work. so parked up the car, topped up to max with G12+ and left over night. came out this morn to find the reservior empty and a pool on the floor!

 

its never leaked like that before and cant see where its coming from? filled it back up, switched back to the black cap and drove for 20 minutes and no leaks now?!

 

confused! thanks in advance

The black cap looks more like the genuine design.  Is that the original?   The other thing to check, apart from the usual hoses, if it is still leaving puddles is the actual reservoir starts to get cracks in it and can start to leak with age. 

Photo of mine.

Mine looks like the blue slot above on a 60 plate.

cheeky bump..........

 

car is still losing fluid at almost a litre every 200 miles - all around town driving. it hardly lost anything on a 1000mile return trip to cornwall.

 

i'm at a loss as to why. no mayo in the oil and no drips on the floor?

 

ordered another 5 litres of coolant and but want to keep topping it up all the time. nor do i want to take it to a garage with no idea of whats wrong

When you park up at night leave sheets of kitchen roll placed strategically around the engine bay as tell tales and check the results next morning, if it's an external leak you'll find its source.

If you can't find the leak by careful inspection and shop towel. By the way removing the undergrad for a day or two might help. Then a the next step could well be pressure test cooling system for several hours and maybe compression test too. 

 

Ps what model engine and transmission. Coolant pumps and oil cooler lines can be placed that are quite obscured and usual suspects...

Edited 13 August, 20205 yr by TheClient

On 13/08/2020 at 09:19, TheClient said:

If you can't find the leak by careful inspection and shop towel. By the way removing the undergrad for a day or two might help. Then a the next step could well be pressure test cooling system for several hours and maybe compression test too. 

 

Ps what model engine and transmission. Coolant pumps and oil cooler lines can be placed that are quite obscured and usual suspects...

 

thanks. i think removing the undertray is next.

 

it seems to be when i replace the coolant cap with the blue one it leaks more. it shouldnt do and unless i saw the pufddle under the car when i do i wouldnt believe it myself.

 

i assume theres a small leak from a pipe and when the new blue cap seals the system better than the balck cap and creates more pressure it leaks more.

 

im going to fill it up, drive to my dads work who has a ramp and then change the cap and get it up in the air with the cap off.

 

the car is a 62 plate vrs - plate YP62 NTU. it had a new head gasket, belt and pump done in march 2020

id be more inclined to think the new cap isnt sealing properly, allowing air into the header which in turn is lettimg the coolant out of whereever the leak is. the older cap is a proper seal, and is holding a vacuum on the system to stop the leak.