My heater won't work in mornings and it takes a very long time before does,after I drive for a long time it gets hot as long as it's in motion,if I stop it blows out very cold air.The fan stays on at all times.One machanic said that it may be a vacuum,something about a flap opening and closing,but he don't know if it's a hose or electronic one.
If the colng system has ever been opened;thermostat,water pump or any other cooling system repair,the bleeding process may not have been performed and you may have trapped air in the system causing your problem.This is a normal problem that can be easilly fixed by a qualified tech.
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Best case scenario is your thermostat is stuck open. When this happens the engine will take a long time to warm up and will never get up to full temp. Worst case could be a serious problem such as a blown head gasket. If there is no coolent in the engine the temp gauge will not register either.
the next thing to check would be the selector motors, these motors are what move door to get floor or defrost or vent air and also hot/cold air, look under the dash try to find them, there bolted to heater box,there are 3, locate one by one then move every control and watch to see linkage move find the one that doesnt move and thats your problem, hope this helps.heres a picture to help you know what it looks like.