Rover 25 1.4 heater

Hi All,

I have just replace my thermostat and saab by pass valve on the car, but the heater is still only blowing hot when moving. If stuck at lights etc the heating is cold, any other ideas.

I have bled the system and flushed through, the HG was replaced earlier this year, could the matrix be blocked partially and only working when more force is applied.

Thanks,

Stuart.

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