Heater Matrix issues?

Hi again chaps,

A few months ago, I had my water pump explode on me, possibly due to my thermostat failing too.
Both have since been replaced, engine appears to be running at the right temperature and the fan switches on / off when needed.

My latest issue is that after 10 ot 15 minutes of driving, I get a very strong smell of rusty radiator water in the cab which only lasts for about 2 minutes (or until I open a window) and the smell goes away never to return until the next time I use the car.

I can understand that its the heater matrix which is causing the problem however I can't understand why its only for a few minutes and whY I'm not losing any water out of my rad or expansion tank /confusion

Does anyone have any suggestions?
Cheers
CP
 
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