Vauxhall Astra Hatchback (Nreg 1995)1400 Heater not working

[Outtheway]

Since the recent cold weather and snow the heater has ceased to function. The blower only works on the high setting (this was also the case prior to the heater recently not working) the engine temperature is ok and the temp gauge is ok there was adequate anti-freeze in the water and the water level is fine. No hot air is being transferred into the car despite the engine temp being ok and the blower working (albeit only on the highest setting),any ideas as to where i can start looking for the fault ? I have a manual for the car but it would be great if someone could give me some starting point/s. Many thanks as always in anticipation.

[Panic Button]

The blower only running on high speed is because it needs a new resistor pack.

[Outtheway]

Thanks Panic Button thats a good start!

[Panic Button]

I think on yours it is accessed from above, behind the air intake grilles below the screen

[Outtheway]

Thanks for your help PB & darren197373 much appreciated.

[Outtheway]

Forgot to mention that when the blower works (only on max setting at moment) it blows cold air into the car, any ideas on this?

[chas2008]

dont think the resister controls heat just the motor speed, not familiar with Astras but assuming the heater hasnt got electronic water valves (which i dont think it has) it could be the heater rad is clogged up. Just disconnect the hoses to it and flush it through with a garden hose...
The other possibility is one of the cables has broken or become disconnected which controls the air flow, it runs from the temp knob to either a valve or flap, its actually called the ' air temp regulation cable'....Would probably be easier to start with this first..

[Outtheway]

Thanks chas2008