air in engine?

hi my engine recently froze ,it thawed out but will only blow hot air i have bled it from the two bleed valves one on top hose and one on heater rad ,also the top of radiator.if i go on the motorway the temp gage gose up to red till i put on my blowers nad then comes down blowing warmish air ,can anyone tell me if there is a specific way to bleed citreon c5s or have i poss blew my water pump any help appreciated thanks