On my way to work yesterday I noticed my temps were up quite high, so i quickly pulled into a servo to suss things out. Water was boiling in the overflow etc...I let it cool down, finally pulled off the radiator cap and it was pretty much disintegrated...lol After fishing the spring etc OUT of the radiator, replacing it with a new one and filling the radiator back up with coolant and water I thought my problems were over! Not so much...Seems the fans are not turning on and my temps are going up over half way. I only replaced the radiator 6 months ago after the common crack appeared in the top tank. Ive read a few posts on here now and am going to run through the things i need to check. Just to be clear, NONE of the fans come on. With or without aircon on. My understanding was that the passenger side fan turns on when the aircon is on. So far, I *think* ive checked the plug on the fans. By that I meant i pushed the plugs on the porcipine silver thingy (technical i know...) back in. I read a post somewhere about that. This didnt appear to help... Perhaps thermostat? Im not sure if this controls the fans or just opens / closes the water flow. Is there a simple way of testing this? I know that my heater is still working perfectly... Fan relay? This is the one in the middle of fuse box in the engine bay? Anyone know what part number it is? I'll just buy it today just in case...if i can Anything else that i should check? Thanks guys!!! p.s. - I cannot guarantee that the fans have been working since i installed C.O.P...(2 weeks ago...hadnt noticed either way...definately wasnt boiling over) I need to double check if something else is still unplugged, but checking this morning it all seems fine.