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1) Check your water pump is working OK and 2) You may have an airlock in the system. Take the expansion or header tank cap off, set your heater control for hot and exterior air. Start the car and run it till warm. With luck you'll run any air locks out of the system. While warming up, and being very, very careful, try squeezing the main radiator in and out tubes (The fattest) this may also move any air locks on. BUT BE CAREFUL, STAY AWAY FROM AND FANS AND PULLEYS. IF NOT SURE, DON'T DO IT OR STOP THE ENGINE FIRST.
With luck, you should soon start to feel warm air coming from the vents.
iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector motor, if it takes a while to reach operating temp then replace the t-stant,also make sure the coolant is full in radiator,check when cold or warm,dont open when hot, hope this is helpful.