UK Car Repair: vauxhall corsa 1.4 16V, vauxhall corsa, heater hoses

Question
Hi
I have only just recently asked you a question and you really helped, thankyou, would like to ask another if its ok. My heater is not working now, only blowing cold air out, no matter how warm engine has got. Could you point me in the right direction to try to solve this please.
Many Thanks Again, Dawn

Answer
Look for the heater hoses in the engine comp't. Follow them back to where they go into the car, you will find one has a valve in it, it could be vacuum or electricaly operated.  Make sure the connection hasn't come off.  On many cars you can operate the valve by hand. Have someone turn the system from hot to cold a number of times to see if the valve is working. Be careful when working under the bonnet with the engine running.