i live in washington and it recently got warmer and i kinda fill up my car with coolant from just a little every month. ever since it got warmer, my car suddenly starts over heating at idle but when im on the freeway its fine. when i warm up my car in the morning i smell coolant but i dont see anything on the ground. my car's resevior boils over. now my question is it a blown head gasket? i havent really checked my radiator but i highly doubt it. any suggestions???

 

is your radiator fan working?