Random 100oC

[GR40]

I have noticed that my temperature creeps up to 100oC randomly, mostly when I am moving or standing uphill (the front of the car higher than the back) even without me pushing it. It drops to 95 imediately if I rev it up to 2000rpm and drops back to 90 after just 100 meters moving. I have changed both temperature sencors (blue and black). What could possibly be causing this? I know the fan kicks in correctly. Can this be caused by air bubbles traped in the system? I think it bleeds itself or am I wrong? Is this a sigh of a leak? I am monitoring the level of coolant and it hasn't droped at all in more than 5 months.

Ps: I am sorry for not posting this earlier (cause I am stupid) for people not familiar with my car, its an Arosa fitted with the engine from my now late, eatoned polo g40.

http://www.polog40.co.uk/forum/index.php?topic=10823.0

[Etches]

There is a bleed screw on the heater matrix end, get the car warm enough for the rad to be open circuit and unscrew the  bleed screw untill water comes out.

I dont think thats the issue though, could be clocks maybe

[GR40]

Not on my arosa  ! I can't think of any reason why it should do it specifically on the uphill though even if it is a clock problem.

[hayesey]

so you don't have any way of bleeding the system?  all I can think is an airlock too.  or a dodgy dial in the clocks.

[GR40]

I though the system was bleeding itself from the expantion tank as it is at the highest spot in the engine bay. Am I wrong? At least that is how you bleed it with the original arosa engine!

[Ben.lopo]

There is a bleed screw on the heater matrix this is the highest point on polos and probs the same on an arosa

Ben,

[GR40]

The Arosa has the heater matrix 90 degrees turned in comparison to the polo so that both the tubes are at the top of it and sits lower than the expansion bowl thus doesn't need a screw to bleed it! . Plus u have no access to it unless u take half the dash out!

[Alexiskayak_7]

Alex, lets say that you dont have any dodgy water temp dial, are you sure that the rad you have dont have any blocked with dirt rows?
Its a common issue if you mix different coolants.

P.S. I'm still in search of the injectors and the mani

[GR40]

The radiator was checked previously to fitting and didn't seem to be blocked at the time. I tent to believe its an air bubble. I ll bleed the system and we ll go from there.

Ps. Keep your eyes open. If we can't source any of the two we ll just make the best out of the existing setup for now.