vr6 coolant question

[mush]

I’ll try explain this best I can don’t shoot me down but I defo need an answer to this if someone knows.

I’ve had a kind of overheating issue with my vr6 recently, and it turned out the thermo went faulty, after testing it a few times it only opens every now and again or when it decided it wants to.

new thermo put back in (also tested before it went in) so coolant took a while to bleed and now have less pressure on the top hose.

my question is,

off the top radiator hose there is small pipe that leads to the coolant bottle which then goes to a t pipe then to the throttle body now this pipe is stone cold from the radiator pipe to the coolant bottle however after it reaches the t junction on the coolant bottle its nice and hot from there up to the throttle body, so why is it cold? should it be?

since I’ve had the car its always been the above not just after a coolant change and new thermo always been cold

so if its meant to be warm all the way up then I presume I have an issue, does it get blocked inside the loop in the throttle body or lower down on the top rad hose?

im not driving the car till I know its right

[mush]

come on vr6 owners  all i need you to do is hold the bottom pipe that comes off the top radiator hose to coolant bottle and say if its hot or cold (NOT THE TOP ONE) that goes into the throttle body 

when its been driven of course 

if its hot then its another drain on the pink stuff again  to investigate my problem

[mush]

this turned out to be a massive air lock 

i drained and refilled into the block from the top radiator hose and managed to more or less fill the system backwards and push all the air up and out of the top collant bottle, as you refil you see the pink coolant raise up into the bottle (its pretty cool and strange seeing it go up) <<<< i know im sad

i would recomend this trick saves alot of bleeding, also my issue with a cold top hose that goes back to throttle body is nice and hot now and no cold spots.

[Gti_Jamo]

They do suffer with air locks and your correct not to drive it. That cylinder head struggles to keep cool at the best of times.