I have a brand new Hyundai Excel rad that i got in order to keep to a similar cooling system like the MX5.
It is a copper rad with the filler neck on top and an expansion bottle.

Now that i am breaking my clio, I have an Aluminium rad of it. It was replaced two years ago but the rad is full of rust inside as at some point of it's life before my bying it my clio overheated.

I also have the heater matrix which as well is rusty inside but is aluminium. But also have a brand new escort heater matrix as well of copper.

Which ones do i keep and which ones to sell?

All comments appreciated.

[Edited on 15/3/09 by l0rd]

ali rads loose heat better, you can pic up brand new polo rads for about £30-£40 if either of the two that you have are not compatible

Mx5 have a filler neck on the rad and an expansion bottle that runs through the filler neck of the rad.

The Hyundai rad is the same. I only need to change the filler cap in order to maintain the MX5 cooling system pressure.