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Thermo ? Or not

Schwarz

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Guys
I dont usually get to go on the open road but did today 80 ,100k etc and about 40mins into it I over heated pulled over etc cooled her down throw a **** load of water in it nd did the slow trip home
Is my thermostat not opening at high speed at around the 50k areas temp is good
I picking it's not opening and it's all going back into the radiator nd then the rest gets pushed into and out the overflow
Slowest 45km trip ever lol
 

Trevor loves holden.

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Try a new cap maybe not Holding pressure , thermo or restricted radiator core, your hoses ant getting sucked in?
 

Schwarz

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Try a new cap maybe not Holding pressure , thermo or restricted radiator core, your hoses ant getting sucked in?
The hoses were holding pressure
Radiator been flushed not so long ago
If it's a cap or thermo they dont seem to last long these days I only replaced them this year
 

Aussie Trev

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When you did the rad flush and new thermo did you do the whole air bleed thing correctly because an airlock will give you the type of result you had.
 

_R_J_K_

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Doubt it's your thermostat, otherwise it would happen at any speed, not just below 50.
 

Schwarz

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When you did the rad flush and new thermo did you do the whole air bleed thing correctly because an airlock will give you the type of result you had.
Read flush was done about a month or so ago
Thermostat was done at the beginning of this year
And yes bleed the system been driving all good until I reached the higher speed area
 

Aussie Trev

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Did the temp go up slowly or just suddenly go from normal to off the scale?
 

Lex

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Try tightening all hoses, then get the engine up to temp, then re-bleed it. Do this (bleed) with the heater on high.
Also after going for a drive (going to shop, whatever) bleed it again.
Do this 2 or 3 times, or maybe more. No air may not come out of it, when bleeding, but by doing this a few times, you will eventually get all the trapped air out.

You've replaced the water pump & heater tap haven't you?
 

Aussie Trev

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Did you open the bleeds on either side of the block after draining the system or just the one on top of the thermostat?
 
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