Hi
My pug 106 97(R) always blows cold air even when the car is warm. Tried to flush out the cooling system and found loads of rusty water. But not fixed it.
The car runs at normal temp and appears normal but will not blow warm air.
Thought it may be the heater matrix but don't want to go down this route as i know it can be a pain.
Any ideas please.

Coldpug, February 2009

Sounds as if you've answered your own question. Rust could well be blocking the heater matrix. Either have a go again at flushing it out or replace the matrix. I'd flush the matrix out separately through the hoses at the back of the engine. That'll help tell if the matrix itself is blocked irretrievably.

Chicks Fan, February 2009