In the last couple days, whenever I'm waiting in a traffic jam or just not moving with the engine running, my temperature gauge keeps shooting upwards.
When I start moving again, the temperature goes back down after 30 seconds or so.
I had a look at the radiator, and it's pretty battered (though it has been since i bought it). Could the hot weather at the moment make a difference?
The main damage to the radiator is right in front of the fan, so it only seems to cool properly when i'm moving and the whole radiator's getting cooled. The fan still works though..
This has only happened in the last 2 days, since it's been really hot.
Here's a few pics of the rad:



New radiator?
Or could it be something more serious?
Cheers, Felix