Probable low on coolant check your coolant lvl, if it is full then you may have a restricted heater core, in the case of the heater core one of the heater hoses will be much cooler than the other, you can reverse the hoses and sometimes remove the restriction enough to make descent heat
I want to mention that back flushing the heater core could plug your radiator, IT is best to but a flush kit then remove both hoses and then flush the heater core, if the water is rusty you may get a leak from the heater core, If the water flushes both ways OK and you still have the problem you could have a broken water pump impeller shaft and at idle it could barley turn but at higher idle it would move enough water this is a missed problem many times so wanted to add this just in case yo did not have any luck with the first option.
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