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[tunnie]

How can I prove thermostat is stuck open
Haven't heard my fans come on for a while

Fact you mention it's not getting up to operating temp of around 90, and it's stuck around 80 is a clear suggestion is stat, also most common cause and well known for them to get sticky.

Also get the coolant transfer pipe as they are a pig to separate and pipe often breaks. 

[Andy B]

How can I prove thermostat is stuck open
Haven't heard my fans come on for a while

Start the engine from cold and keep an eye on the temp of the top hose. If it gradually gets warm as the engine gets warm, then the 'stat is stuck open. The top hose should stay cold up to the point of the 'stat opening at which point it should suddenly get hot. 

[Doctor Gollum]

Classic Stat. They usually fail open. 

CTS fails to -40°c causing massive over fuelling... Only starts from cold and then runs like an absolute dog once warm and then won't start. 

[biggriffin]

How can I prove thermostat is stuck open
Haven't heard my fans come on for a while

for the price of a stat, just replace it.

[j3lly]

How can I prove thermostat is stuck open
Haven't heard my fans come on for a while

Fact you mention it's not getting up to operating temp of around 90, and it's stuck around 80 is a clear suggestion is stat, also most common cause and well known for them to get sticky.

Also get the coolant transfer pipe as they are a pig to separate and pipe often breaks. 

Coolant transfer pipe are you talking item 15 here

Thanks

[Doctor Gollum]

https://www.omegaowners.com/forum/index.php?topic=144695.0

[j3lly]

How can I prove thermostat is stuck open
Haven't heard my fans come on for a while

Fact you mention it's not getting up to operating temp of around 90, and it's stuck around 80 is a clear suggestion is stat, also most common cause and well known for them to get sticky.

Also get the coolant transfer pipe as they are a pig to separate and pipe often breaks. 

School boy error

https://vauxhall.7zap.com/en/car/j96/f/0/26-2/

[biggriffin]

How can I prove thermostat is stuck open
Haven't heard my fans come on for a while

Fact you mention it's not getting up to operating temp of around 90, and it's stuck around 80 is a clear suggestion is stat, also most common cause and well known for them to get sticky.

Also get the coolant transfer pipe as they are a pig to separate and pipe often breaks. 

School boy error

https://vauxhall.7zap.com/en/car/j96/f/0/26-2/

Think there's some parts available in the relevant section, from different members, might be worth a look 

[j3lly]

Just done some checks with basic diagnostics ( Torque Pro )
here are the results
Rad top hose out of thermostat starts to get warm at 70'
Whats interesting ( To me anyway )
The 2 smaller dia pipes going to header tank
One gets warm as car warmed up the other only stated to get warm at 70'
A noticeable difference
Rad fans kicked in at 98'

Unsure now
Any thoughts

[Doctor Gollum]

Stat is still stuck open...

That pipe goes from vaguely warm to hot the instant the s stat opens if it's working 

[biggriffin]

Get it changed, why wait for it to jam closed, you are 99% sure it's faulty.