hi i have just replaced my radiator and now having problems,
the car overheats in real quick time i go round the block a couple of times and thats it overheat the car is struggling too does not seem right sluggish, not got a lot of knowledge and dont no what i have done or to do now, also theres water coming out of the header cap any advise would be great thanks

 

You have an Airlock in the system and do not have enough water in it.

you need to try bleeding it out.

Leave the Rad cap off with the car running, the air bubbles will escape.

I tend to back fill the system by filling the radiator through the top hose, but even this way you still need to bleed the sysetm out squeeze the top hose the header tank will keep dropping if you leave your heater on hot you will see when it constantly becomes hot.

 

thank you i will try that