Pressure again

Rikki · 28th May 2017, 11:19

Greyscale hasn't moved or been started for two days, as I am away tomorrow in her for 5 days I did a pre-trip check, and on releasing the coolant cap heard a slight, but noticeable hiss of pressure.

On inspection the coolant level was up just below the filler neck, well above the "Fins" where I know she was filled too. No coolant has been added since she was serviced and the coolant changed.

Any ideas?

T-Cut · 28th May 2017, 12:26

The coolant was over-filled, so should be adjusted to the correct MAX mark. This is at the base of the fins. There should be no residual pressure in the cold system, but do the test again with the correct inventory.

After a drive, allow it all to cool down at least six hours and preferably overnight. Check for residual pressure.

TC

Rikki · 28th May 2017, 13:36

Its level was below the fins last check- and none has been added? that's whats confusing me

HarryM1BYT · 28th May 2017, 13:47

Quote:

Originally Posted by Rikki

Its level was below the fins last check- and none has been added? that's whats confusing me

There will always be some variation due to changes in temperature and even atmospheric pressure.

Rogue · 28th May 2017, 16:30

Quote:

Originally Posted by HarryM1BYT

There will always be some variation due to changes in temperature and even atmospheric pressure.

What was the ambient temperature when you previously checked it compared to today? You might be surprised how much water expands with even a little extra heat introduced and its certainly been considerably warmer here for the last couple of days.
Try checking it later this evening when the temperatures drop a little before you start worrying too much.

Rikki · 28th May 2017, 16:36

Its not that hot here today , although quite a bit warmer than when I last checked it, took it out for a spin and the temperature stayed within her normal parameters- 95-98 - will see what its like tomorrow morning once she has cooled down again.

T-Cut · 28th May 2017, 15:32

Quote:

Originally Posted by Rikki

Its level was below the fins last check- and none has been added? that's whats confusing me

You mean it was at the bottom of the fins one day and after driving and standing, it was at the top? If so, I'd say that's a worrying sign.

TC

Rikki · 28th May 2017, 16:20

yup that's what I am saying !

T-Cut · 28th May 2017, 17:34

Quote:

Originally Posted by Rikki

yup that's what I am saying!

That's a volume increase of around half a litre, which I measured using my experimental split tank.

This is the water level set about 'MIN'.

Using the calibrated beaker, I added 450ml more water - -

which brought the level to about 5mm lower than the top of the fins.

Clearly, this apparent increase in the volume of your coolant isn't due to variations in ambient temperature/pressure from one inspection to the next.

I suggest you have a carbon dioxide test done on your coolant. Either a garage can do it or you can buy simple DIY test kits on eBay.

TC

28th May 2017, 11:19	#1
Rikki Loves to post MG ZT+ 190, Land Rover Series IIA, KIA Pro C'eed VR7 Join Date: Apr 2017 Location: Redcar Posts: 258 Thanks: 151 Thanked 158 Times in 53 Posts	Pressure again Greyscale hasn't moved or been started for two days, as I am away tomorrow in her for 5 days I did a pre-trip check, and on releasing the coolant cap heard a slight, but noticeable hiss of pressure. On inspection the coolant level was up just below the filler neck, well above the "Fins" where I know she was filled too. No coolant has been added since she was serviced and the coolant changed. Any ideas? __________________ [SIGPIC][/SIGPIC] *GREYSCALE* Born Monday, 14th July 2003 @ 12:51:51 9,940th ZT to run off the production line, out of 18,894 2,948th ZT 190 + to be made out of 4,023 1,042nd ZT in XPower Grey (code: LEF) to be made out of 3,143 XPower Grey ZTs Done: Cam belt and aux belts. Water pump, pulleys and tensioners, Hunter wheel alignment, New thermostat and housing, Plenum guard mod, refix undertray, Bonnet cable mod, upgraded Balance VIS motor, One empty bank account, one nervous breakdown.

28th May 2017, 13:36	#3
Rikki Loves to post MG ZT+ 190, Land Rover Series IIA, KIA Pro C'eed VR7 Join Date: Apr 2017 Location: Redcar Posts: 258 Thanks: 151 Thanked 158 Times in 53 Posts	Its level was below the fins last check- and none has been added? that's whats confusing me __________________ [SIGPIC][/SIGPIC] *GREYSCALE* Born Monday, 14th July 2003 @ 12:51:51 9,940th ZT to run off the production line, out of 18,894 2,948th ZT 190 + to be made out of 4,023 1,042nd ZT in XPower Grey (code: LEF) to be made out of 3,143 XPower Grey ZTs Done: Cam belt and aux belts. Water pump, pulleys and tensioners, Hunter wheel alignment, New thermostat and housing, Plenum guard mod, refix undertray, Bonnet cable mod, upgraded Balance VIS motor, One empty bank account, one nervous breakdown.

28th May 2017, 16:36	#6
Rikki Loves to post MG ZT+ 190, Land Rover Series IIA, KIA Pro C'eed VR7 Join Date: Apr 2017 Location: Redcar Posts: 258 Thanks: 151 Thanked 158 Times in 53 Posts	Its not that hot here today , although quite a bit warmer than when I last checked it, took it out for a spin and the temperature stayed within her normal parameters- 95-98 - will see what its like tomorrow morning once she has cooled down again. __________________ [SIGPIC][/SIGPIC] *GREYSCALE* Born Monday, 14th July 2003 @ 12:51:51 9,940th ZT to run off the production line, out of 18,894 2,948th ZT 190 + to be made out of 4,023 1,042nd ZT in XPower Grey (code: LEF) to be made out of 3,143 XPower Grey ZTs Done: Cam belt and aux belts. Water pump, pulleys and tensioners, Hunter wheel alignment, New thermostat and housing, Plenum guard mod, refix undertray, Bonnet cable mod, upgraded Balance VIS motor, One empty bank account, one nervous breakdown.

28th May 2017, 16:20	#8
Rikki Loves to post MG ZT+ 190, Land Rover Series IIA, KIA Pro C'eed VR7 Join Date: Apr 2017 Location: Redcar Posts: 258 Thanks: 151 Thanked 158 Times in 53 Posts	yup that's what I am saying ! __________________ [SIGPIC][/SIGPIC] *GREYSCALE* Born Monday, 14th July 2003 @ 12:51:51 9,940th ZT to run off the production line, out of 18,894 2,948th ZT 190 + to be made out of 4,023 1,042nd ZT in XPower Grey (code: LEF) to be made out of 3,143 XPower Grey ZTs Done: Cam belt and aux belts. Water pump, pulleys and tensioners, Hunter wheel alignment, New thermostat and housing, Plenum guard mod, refix undertray, Bonnet cable mod, upgraded Balance VIS motor, One empty bank account, one nervous breakdown.

28th May 2017, 12:26	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The coolant was over-filled, so should be adjusted to the correct MAX mark. This is at the base of the fins. There should be no residual pressure in the cold system, but do the test again with the correct inventory. After a drive, allow it all to cool down at least six hours and preferably overnight. Check for residual pressure. TC