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

Overheating Issue (Boiling)

sprayzz

sprayzz
Joined
Dec 4, 2007
Messages
155
Reaction score
2
Points
18
Members Ride
vs commodore
Hey Everyone,

I have searched the forums, found some good suggestions but thought i would post my own thread to see what others think.

Currently, when the engine temp reaches 102 Degrees i can hear boiling in the reservoir with fans not running unless AC is on which is not ideal long term. I have replaced the Radiator, Pipes, water pump, radiator cap and Thermostat and still same issue even when i have bleed the air out of the system.

My next thought was to look at replacing the Coolant temp sensor.

Thoughts anyone?
 

Fu Manchu

Donating Member
Joined
Mar 18, 2006
Messages
8,584
Reaction score
6,086
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
Coolant temp sensor, worth doing, not expensive.
Have you checked the fan is working?
So both fans come on or one?
 

99notout

Active Member
Joined
Aug 10, 2013
Messages
584
Reaction score
131
Points
43
Location
Adelaide
Members Ride
VZ Equip Wagon
If it is pressurised then it can't boil at 102 degrees, so if the radiator hoses are firm (under pressure) then the temperature reading is off. Replace the sender as previously mentioned.
 

Trevor loves holden.

Well-Known Member
Joined
Jun 6, 2019
Messages
3,505
Reaction score
743
Points
113
Location
Victoria
Members Ride
vs commodore
So before all this replacement it did the same as its doing now? Thermo relays maybe, did you bleed it with heater on full?
 

Fu Manchu

Donating Member
Joined
Mar 18, 2006
Messages
8,584
Reaction score
6,086
Points
113
Location
WA.
Members Ride
Slug powered VZ, Cross 8 VZ, VE Calais & ya mum.
Yeah, could be air bubbling through rather than it boiling.

Just this arvo I screen shotted a bit of info on the Alloytec cooling system.
 

sprayzz

sprayzz
Joined
Dec 4, 2007
Messages
155
Reaction score
2
Points
18
Members Ride
vs commodore
Coolant temp sensor, worth doing, not expensive.
Have you checked the fan is working?
So both fans come on or one?
Yeah mate both come on when AC is on. Will be replacing sensor Wednesday next week.
 

sprayzz

sprayzz
Joined
Dec 4, 2007
Messages
155
Reaction score
2
Points
18
Members Ride
vs commodore
So before all this replacement it did the same as its doing now? Thermo relays maybe, did you bleed it with heater on full?
Correct, I bleed the system with heater on full and no change unfortunately
 

sprayzz

sprayzz
Joined
Dec 4, 2007
Messages
155
Reaction score
2
Points
18
Members Ride
vs commodore
Does anyone know at what temp does the fans kick in? My local mechanic who did my thermostat said 90 degrees the fans should kick in and within forums people say 108 which is a big difference considering mine is boiling at 102.
 

sprayzz

sprayzz
Joined
Dec 4, 2007
Messages
155
Reaction score
2
Points
18
Members Ride
vs commodore
Coolant temp sensor, worth doing, not expensive.
Have you checked the fan is working?
So both fans come on or one?
Correction - with the AC running the drivers side fan is working and not the other, so not sure what to make of that.
 
Top