has my engine just overheated? (urgent)

[TiddlesRX7]

Looks like it could be the problem. Fingers crossed thats all it is. Nice easy fixes are the best!

[dthebuk]

okey doke, still haven\'t had much of a chance to do anything.
But i added water to the system, from where the rad cap is, check for bubbles when cranking, there was nothing
Also had the car running with a TII rad cap (thanks to Pete for sending me one quickly ) , this is also leaking, i don\'t think its faulty, i think its just different to the egi cap as it doesn\'t seem to have a rubber seal, shall get a pic later tonight. Managed to warm the warm the car up fully before seeing the steaming coolant coming out, which is good. Also once warm the car was producing no smoke out the back

Also i believe the expansion tank is overfilled, Even though the sad had lost water the expansion tank remained the same? Not sure how the expansion tank works, so if someone could clear that up for me it would be great.

now where can i get an egi rad cap from?


cheers

[Prof]

The expansion tank will only work properly if the rad cap is forming a seal.
 
Basically the system will pressurize when running, so will push any extra coolant into the expansion tank, and then when it cools, if the coolant is on the low side, the vacuum caused as the coolant cools will pull some back in to the radiator.  The one thing to remember is the long pipe is the one that needs to go into the liquid otherwise it won\'t work - seen some expansion tanks plumbed the wrong way :eek