The heaters in my Mk4 fiesta only blow on number 4.

They used to work intermittently (sp) on 1 - 3 but now they will ONLY work on no 4.

Does anyone have any idea what causes this?

I have tried a replacement control panel and the problem is still there.

Also:

Does anyone know if the 1.4 16v and 1.6 16v Zetec engines would run on the 1.25 16v Zetec loom and ECU?

Cheers
John