gilesharrison
Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
  
|
| Coolant level drops on starting car |
|
Hi all.
I'm having an odd problem with my coolant level. I've topped the resovoir up correctly when the engine is cold and it is sitting at the right level. On starting the car from cold, the level initially appears fine and no 'low coolant' warning is seen on the dash.
Within about 2-3 mins of driving, I tend to see the 'low coolant' warning on the dash. This tends to remain for about 2 mins before disappearing. I don't to see the warning again unless the car sits and idles for a long period when warm.
Any ideas?
|
 10th Jul 2018 9:30 am |
|
|
Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12709
 
|
Assuming when you recheck physical level I'd still ok ... which should eliminate airlock being the cause ... Is your coolant 50/50 antifreeze and water? If not, syphon a couple of litres out and add neat antifreeze. The sensor needs the mix to have right density. .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer  ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
|
| 10th Jul 2018 9:50 am |
|
|
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10365
 
|
get a new bottle off ebay. £25 ish.
its comes with a new float and sensor. (use old cap)
|
| 10th Jul 2018 6:33 pm |
|
|
gilesharrison
Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
|
Didn't realise that about the antifreeze mix effecting the float, thanks for that.
The coolant bottle was changed about 2 years ago. The old one gave a constant low coolant warning. Do people think this intermittent warning could be a faulty float sensor?
|
| 10th Jul 2018 9:31 pm |
|
|
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10365
|
I think the top 1/4 of the rad needs to be empty for the sensor to genuinely trigger.
So I can't see that due to a fluctuation.
|
| 10th Jul 2018 9:53 pm |
|
|
