dai77

Thanks for the information Steve. I will give it a go.

Sorry. It is a diesel. Would a boost pipe be linked to it only happening once the car has warmed up?.

I have recently noticed an annoying rattle that seems to be coming from the front dash area of the car. It isn't there until the car warms upto temperature and sounds like a rasping noise when putting my foot on the accelerator. I was wondering if it could be exhaust related or maybe a heat shield rubbing on something. Any help is greatly appreciated.

The engine is getting upto temperature and can feel the inlet and outlet hoses on the matrix are hot which is why I was thinking the matrix is okay. The blower on the passenger side of the car is a lot warmer than the one on the drivers side.

My audi a3 heaters only get luke warm and seem slightly warmer on the passenger side of the dash. Both heater matrix hoses are hot after working temperature is reached which makes me think the matrix is okay.