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Find the screw located on the cooling pipe and using a screwdriver turn it half a turn. Do this whilst the engine is running and you will hear a "hissing sound" (air) exiting from the screw. DO NOT REMOVE THE SCREW COMPLETELY. Keep listening and watching until water comes out. The water that comes out should be luke warm depending on how long the engine has been runnning and it may shoot out fast so be careful. Once water exits turn the screw back on, and top up the water levels. If your finding it difficult to get rid of the excess air then squeeze the water pipes in a pumping motion every few second which should make the air travel around the pipes easier. Dont forget to top up the water level to the maximum line when your complete. Having the heater on in the car full you should now start to feel the heat come through. Ps. whilst doing this don't have the fan on inside the car, a) it wont do anything in the process and b) it will only make a sound distracting you from the job at hand. The only issue on this subject is finding and locating the screw to undo.
Alternatively if your really struggling ...this next option will either work or not. Where the water reservoir is (where you top up the water) leave the lid off, start the car and leave it running for approx 30 mins. This "should" naturally let all the air out of the system. After 30 mins put the lid back on, checking the water level and if your really lucky it will have drained the air out by itself.
If you still have no heat then check the thermostat temp inside the car, if its not moved from the cold mark then chances are you need a new thermostat (cheap to purchase, pain to fit...will require a garage or else you will break the gaskets. If the fan inside the car doesnt work then its a fuse, check them and replace accordingly. If the thermostat inside the car is well over the halfway mark then get the car to the garage asap as the engine is rapidly overheating and you may just as well purchase a new car for the amount of damage its causing.
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