« previous next »
Pages: [1] 2

Author Topic: Engine coolant temperature low  (Read 7580 times)

Offline Hawaii-Five-O

  • I live here
  • *****
  • Posts: 915
  • Are we nearly there yet?
Engine coolant temperature low
« on: 05 October 2014, 18:38 »
Today is the first day I noticed my engine coolant temperature gauge only getting up to a maximum of 80°C. Even after a good 40 minute motorway run. I also observed below par fuel consumption, even whilst hyper-milling.

For the 11 months of ownership, without fail, the engine quickly reached 90°C within minutes of the journey.

I've checked engine coolant level and it's right where it should be. Car had its first service end of July.

Is there anything to be concerned about?

Thx
Logged
Current: BMW M140i / ZF8 / 5 DR
Past: MK7 GTI / DSG / WHITE / 5 DR

Offline itavaltalainen

  • I live here
  • *****
  • Posts: 2,692
  • VCDS and VCP - fault codes, coding, VIM activation
Re: Engine coolant temperature low
« Reply #1 on: 05 October 2014, 18:55 »
Either sensor not working correctly or the thermostat has packed in.
Logged
2019 Seat Leon ST FR DSG 135kW - eclipse orange - 23k miles

Offline RedHP

  • I live here
  • *****
  • Posts: 621
Re: Engine coolant temperature low
« Reply #2 on: 08 October 2014, 21:44 »
Within 3 months of new ownership of my Mk6 Git, my coolant light was activated.

I took it to the dealer who acknowledged that there was a known issue with the water pump and replaced free of charge/under warranty. I would have thought that this known issue would have been sorted for the Mk7...................hmm...!

Red
Logged
Mk6 GiT since birth in 2010

YNWA

Offline corgi

  • I live here
  • *****
  • Posts: 761
Re: Engine coolant temperature low
« Reply #3 on: 09 October 2014, 08:49 »
Quote from: RedHP on 08 October 2014, 21:44
Within 3 months of new ownership of my Mk6 Git, my coolant light was activated.

I took it to the dealer who acknowledged that there was a known issue with the water pump and replaced free of charge/under warranty. I would have thought that this known issue would have been sorted for the Mk7...................hmm...!

Red

Unlikely to be a water pump problem as Hawaii-Five-O's coolant temperature is lower than expected. I'd expect the opposite with a water pump issue... unless all the water had leaked out in which case the temperature sender can read lower (because there's no coolant)...

I suspect this could be down to the thermostat, as stated above... If it has failed open, then it will take a long time for the car to get up to the normal running temperature, if it ever did...
Logged
_____________________________________________
Corgi

Carbon Grey Metallic, GTD 3 Door Manual, Dynaudio and Advanced Phone Prep
In the Garage: 2010 Jaguar XKR 5.0 Supercharged Convertible replaced 2004 911 (996) Carrera 4S Cabriolet (15/3/15)

Offline Hawaii-Five-O

  • I live here
  • *****
  • Posts: 915
  • Are we nearly there yet?
Re: Engine coolant temperature low
« Reply #4 on: 09 October 2014, 13:21 »
Thanks for the feedback chaps.

Sounding like a defective sensor in the coolant chamber (can see wiring going into the top of it). Reluctant call to dealers imminent me thinks :(

Been monitoring the coolant temperature gauge all week, on my daily commutes, and it's still dicky. Fluctuating between 70ºC - 90ºC which is obviously disconcerting.

Could this be effecting my fuel economy? I've noticed a decrease since it started playing up (but could be coincidental since the weather turned cooler this week).

Cheers H5O
Logged
Current: BMW M140i / ZF8 / 5 DR
Past: MK7 GTI / DSG / WHITE / 5 DR

Offline corgi

  • I live here
  • *****
  • Posts: 761
Re: Engine coolant temperature low
« Reply #5 on: 09 October 2014, 13:45 »
Quote from: Hawaii-Five-O on 09 October 2014, 13:21

Could this be effecting my fuel economy? I've noticed a decrease since it started playing up (but could be coincidental since the weather turned cooler this week).

Cheers H5O

It could be, H50, if the ECU is taking the temperature from the same sensor as the gauge...
Logged
_____________________________________________
Corgi

Carbon Grey Metallic, GTD 3 Door Manual, Dynaudio and Advanced Phone Prep
In the Garage: 2010 Jaguar XKR 5.0 Supercharged Convertible replaced 2004 911 (996) Carrera 4S Cabriolet (15/3/15)

Offline Hawaii-Five-O

  • I live here
  • *****
  • Posts: 915
  • Are we nearly there yet?
Re: Engine coolant temperature low
« Reply #6 on: 13 October 2014, 10:56 »
Car booked in for Friday to look at Coolant Temperature gauge/sensor fault. Will update on what happens.

Seems both DougL and I are suffering with the same fault. Be interesting to see if it's common or not.
Logged
Current: BMW M140i / ZF8 / 5 DR
Past: MK7 GTI / DSG / WHITE / 5 DR

Offline DougL

  • Here all the time
  • ****
  • Posts: 312
Re: Engine coolant temperature low
« Reply #7 on: 13 October 2014, 13:01 »
Mine is booked in on Thursday. Definitely suffering decreased fuel economy.
Logged
Tornado Red GTI 3dr manual

Previous Golfs Mk1 GLS and GL, Mk2 GL and Driver, Mk3 GL, Mk4 GT TDI, Mk6 TDI (and a Mk2 Scirocco 20 years ago)

Offline rocknob

  • Not said much yet
  • **
  • Posts: 85
Re: Engine coolant temperature low
« Reply #8 on: 15 October 2014, 03:03 »
The engine is probably running richer because the ecu thinks the water temp is still low. That would explain the increased fuel consumption
Logged
Current Car :  Tornado Red VW Golf GTI DSG DCC ParkAssist Xenons

Offline golfhappy

  • I live here
  • *****
  • Posts: 648
Re: Engine coolant temperature low
« Reply #9 on: 15 October 2014, 07:39 »
Quote from: rocknob on 15 October 2014, 03:03
The engine is probably running richer because the ecu thinks the water temp is still low. That would explain the increased fuel consumption

True the ECU gets a feed from the ECT sensor, so you'll be running slightly rich.
Logged
Audi S1 gone, awaiting 1.5tsi r-line, pan roof, led lights front and rear, active dash, 18" jurva alloys and a dealer fitted Oettinger roof spoiler in tornado red.
Pages: [1] 2
« previous next »