Engine coolant warning.

[Jon1967x]

My V8VS has developed a hidden g-force light.. Go around a left hand bend with any vigour and I get a flash of the engine coolant level low warning. Checked the level and it looks fine but it did become fun trying to reproduce fault after a while

Is this a 'feature', badly placed sensor or really is a problem?

TIA

[V12Vanquish]

Did you check the level with the engine completely cold?

[Jon1967x]

Luke warm but the header/expansion tank was far from empty. It was raining so I didn't hang around

Its going in for some other warranty work so I'll get them to top ip and check I just wondered if it was a 'feature'

[krisdelta]

Not come across this before and I *may* have undertaken some vigourous corning on occasion. Cockers or Rob are the most likely to have uncovered this, if it's a feature I'd have thought.

[Jon1967x]

Yep. I'm sure they'd know. I just don't like the thought of losing coolant after 2500 miles

[bogie]

Ive had similar, would check it when cold and top it up level, then later same day it was telling me it was low

replaced sensor, its approx £16 ish and easy enough to fit ....its now happened twice in the last 7 years/67K miles

...just bad luck with a dodgy sensor....

[Sump]

Any chance you have a part number or location of that sensor ?

[bogie]

Sorry don't have the part number, It was supplied by garage at the time

switch is inside the main expansion tank and detailed in workshop manual under

"Coolant Level Switch-Renew 03.03.KP"

[Sump]

Hmm, can't see anything with that reference in my "DB9 Workshop Manual.pdf"

I assume it's just that sensor at the bottom of the expansion tank. Does the coolant need to come out of that tank below the level or can you just yank the switch out without removing coolant?

[bogie]

Maybe its different, I have the Vantage workshop manual here...

remove expansion tank from car..replace sensor in tank, replace and top up coolant

Expansion Tank Assembly-Renew
Removal
1. Using a syringe, remove coolant from expansion tank.
2. Remove bolts (x4), remove LH corner cross brace.
3. Release clips, disconnect coolant hoses (x3) from
expansion tank.
4. Remove upper bolt and side nut securing expansion
tank.
5. Raise expansion tank sufficient to disconnect multiplug,
release clip, disconnect hose.
6. Remove expansion tank.
Installation
1. Position expansion tank, connect multiplug, install hose
and secure with clip.
2. Install nut and bolt, tighten to correct torque.
3. Install hoses (x3) on expansion tank, secure with clips
(x3).
4. Install LH cross brace, install bolts (x4) (torque with
vehicle on level ground).
5. Refill expansion tank to correct level with correct
coolant fluid mixture.
6. Clean up any spilled coolant fluid.

[Sump]

Ah just do that. Would be far worse to pull it out and coolant go everywhere!

[Cockernee]

krisdelta said:

Not come across this before and I *may* have undertaken some vigourous corning on occasion. Cockers or Rob are the most likely to have uncovered this, if it's a feature I'd have thought.

Only the traction control light Sorry I can't help

[Little Donkey]

Cockernee said:

Only the traction control light Sorry I can't help

So you do leave it on......Busted!

[hashluck]

Jon I had this tonight exiting a roundabout - did you get it sorted or did it not happen again?

[Jon1967x]

hashluck said:

Jon I had this tonight exiting a roundabout - did you get it sorted or did it not happen again?

They topped it up the once and it's not happened since.

[Sump]

Have you checked you don't have a coolant leak ? Mine turned out to be a weep from the radiator. Dropped the coolant just enough over a long period of time to give the illusion of a dodgy sensor.

[Zuman]

A poster on the AM forum at 6speedonline recently got a "low engine coolant" warning on his '05 DB9, and it turned out to be a split TRANSMISSION coolant line!

[hashluck]

Thanks all. Mine flashed on and off once exactly as OP described. Will have a good check of everything in daylight tomoreow. Car in soon for heated seat recall so will also get dealer to check things.

[Jon1967x]

Hopefully it's the same thing, just slightly low. It took them no time at all to sort out and I've done twice the mileage since it occurred without it repeating. If it was a leak, they knew exactly where to look.

I don't know which colour coolant they use to recommend doing it yourself.

[hashluck]

Well there is coolant in the expansion tank but no real indication of what the level should be. Will leave it to the dealer to have a look but to date it was only a one off flash on a hard left