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vx commodore supercharged please help

eliteaaron

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hey i have a problem i cannot figure out my car started doing this a few days after replacing the lim gasket it will warm up like normal and then when i start to drive my car on highway the temp gauge will drop down a bit like its running cooler then normal so i thought maybe thermostat so i replaced it and was fine for another day then again it started doing it last night when driving back home on the highway but when i stop at a light or drive slower it starts going back to normal temp its not affecting the way the car drives or anything just seems a bit strange and annoying also it doesn't always do it like today when i drove it it stayed at normal temp, i have bleed the system a few times thinking it maybe air, is it possible it could be my radiator like part of the old lim gasket got stuck in it somewhere i have also noticed the radiator cap is cold but all hoses are hot i dunno if its normal or not just thought i would mention it. the car does not over heat just moves from normal temp to cold. any ideas would help thanks.
 

Tree cutter

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Is the coolant level in the radiator right up to the bottom of the radiator cap or is there a bit of air still in there. Sometimes the radiator cap will leak a bit so it sucks air back into the radiator instead of sucking coolant back out of the overflow bottle when the engine cools down.
 

Pollushon

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What TC said but my guess would be the air is potentially in the thermostat housing where the sensors are located. You may be getting a false positive because the sensors are getting hot air not water.

As I understand with the L67 there's 3 bleed points and a certain order/method to bleed the system successfully, are you confident you did it text book?

Could be a dud sensor too, you know how it goes, you touch one thing on a cooling system and the house of cards starts to crumble :)
 

eliteaaron

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yeah iam near 100% sure i bleed it correct under charger, thermostat, radiator hose, was gonna replace the sensor and radiator cap today and hope it works
 
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