Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Spiking Temperature Gauge

HamaTime™

VIP Member
Joined
Feb 17, 2008
Messages
1,807
Reaction score
60
Points
48
Location
Melbourne
Members Ride
C Class AMG
Sorry to have to keep bringing this up. But my VS is very temperamental when it comes to it's temperature. It usually runs at a normal temperature of between 1/4 and halfway. Then randomly, either when I'm sitting in traffic, and even when I'm cruising along at 60 - 70 - 80 k's an hour, either accelerating or not, it sometimes spikes to 3/4, sometimes above! It does it almost every trip I make now. But just as randomly as it spikes, it just as quickly dies down to normal level, i.e. 1/4 - half

Thermostat Going?

Temperature gauge going?

Or is the engine really, just spiking in temperature randomly?

IS THIS NORMAL BECAUSE IT'S FREAKING ME OUT AND IS VERY DISCONCERTING
 

WhiteVS

Stockish
Joined
Aug 26, 2007
Messages
164
Reaction score
0
Points
0
Location
Melb. Vic
Members Ride
Sacked VT Berlina
mine does pretty much the same man, has been doing it for quite a while now aswell. :bang:
ill prob be doing a full coolant flush within the week and also replacing the thermostat.
ill let you know how it goes after that.
 

hako

Donating Member
Joined
Aug 1, 2004
Messages
8,020
Reaction score
87
Points
48
Age
77
Location
Toowoomba SE QLD
Members Ride
VS11 BT1 V6
If you reckon the cooling system is OK I'd be carefully checking the connector where it joins the temperature sensor - from memory it's the front one - the other temp sensor is for the ECU....but check the wiring on both for luck as it's not unheard of for the connector and/or cable to break or be loose.
Not sure but I think if the connector is disconnected the gauge goes straight to hot so an dodgy connection could give this problem.
 
Last edited:

ryan1980

New Member
Joined
Mar 9, 2009
Messages
70
Reaction score
0
Points
0
Members Ride
VN
perhaps theres air in the coolant, and it needs to be bled. When the sensor hits an air pocket it spikes?
 

HamaTime™

VIP Member
Joined
Feb 17, 2008
Messages
1,807
Reaction score
60
Points
48
Location
Melbourne
Members Ride
C Class AMG
perhaps theres air in the coolant, and it needs to be bled. When the sensor hits an air pocket it spikes?
Yeah it just randomly goes up, then goes down.

I need to bleed my heater valve again. Would that have anything to do with this?
 

greenfoam

New Member
Joined
Jan 13, 2005
Messages
7,902
Reaction score
125
Points
0
Age
100
Members Ride
VP Executive R-spec
This allways use to happen to my old V6 when it had a bit of air in it, just needed a bit more water and all good
 

hako

Donating Member
Joined
Aug 1, 2004
Messages
8,020
Reaction score
87
Points
48
Age
77
Location
Toowoomba SE QLD
Members Ride
VS11 BT1 V6
I'm no expert but if there are air bubbles circulating in the coolant they will be exactly the same temperature as the coolant...no hotter or cooler.
Check the connections to the sensor first.
 

RK5TAR

New Member
Joined
Apr 12, 2009
Messages
129
Reaction score
0
Points
0
Location
Melbourne
Members Ride
VT V6 Manual
Mine does this! It used to sit on 1/4 all the time. Over time its gone to 1/2 and now 3/4 and back to 1/2. It gets to half within 5 minutes of driving around my suburb. Whereas it didnt before. I also have to every couple of weeks top up the overflow bottle.
Im getting the motor looked at and serviced etc in July sometime when I have funds, but being a single mum with 4 kids I dont want to be out on the freeway and it overheats. I do have RACV roadside assistance but would like it not to get to the point of complete breakdown to find the problem.
RACV can do nothing unless it does overheat etc.
Butthey werent that reliable with my last car, had no idea even though I kept saying "head gasket" they nor the mechanic would listen. A couple of breakdowns/tows & thermostats etc later, sure enough it WAS the headgasket!!
 

HoldenOnn

Roll Cage Territory
Joined
May 26, 2009
Messages
548
Reaction score
4
Points
18
Location
Busselton, WA
Members Ride
VY Calais Series 2 HBD V6 Sedan 2004
My VS which I just sold 2 weeks ago after owning for 3 years was doing the same thing when i first purchased. I did a complete flush, then installed a new genuine thermostat and new genuine holden coolant and radiator cap and water pump tablets then filled and bled.

After this, the temp gauge settled perfect and sat between 1/4 and 1/2 mark. But then after a couple months it started to go up to 3/4 mark after first start of the day (when thermostat 1st opened once warm). I bled the system again but it seemed that it didn't need it.

I then didn't worry as the factory gauge is only a guide. I didn't touch the cooling system again for 3 year and it was perfectly running. The gauge was spasmodic and random at times and would go up to 3/4 mark then thermostat open and fly back down to normal for the rest of the day.

Don't worry too much if you have done all the new coolant, cap, thermostat, water pump tablets etc.

The factory gauge is only an indication and what is to say that the 3/4 mark is only 3 or 4 degrees hotter than the 1/2 mark. Its impossible to say unless you have someone with a tech 2 holden computer which is exactly what my best mate has at his auto electricians. The factory gauge is a guide. If you have done the full service route, then get someone eg holden to put computer on it and they will tell you the exact temp off the computer.

Regards
Matt
 

HamaTime™

VIP Member
Joined
Feb 17, 2008
Messages
1,807
Reaction score
60
Points
48
Location
Melbourne
Members Ride
C Class AMG
All fixed, a leak in the water hose from resevoir to Radiator, flushed the cooling system and refilled it with coolant.

We are good.
 
Top