My 2004 Elantra overheated the other day. I found no coolant in the reservoir. I filled it up, it was fine for a day. Yesterday it started to overheat again and again coolant was empty. I filled it again, but car overheated and died at a red light. It tries to turn over. I have not noticed any leaks in driveway. The a/c, heat did not work either. Thanks

Its leakin on the run--have complete system checked by a pro--or get a repair book like haynes etc for maintenance details

You could have a blown head gasket turning the water to steam as you drive,, feel inside the exhaust pipe to see if there is antifreeze residue there , the heater won't work without fluid in it to be heated and blown out into the vehicle. To check the head gasket have a compression check done on the car, any one or two cylinders lower than the rest means its shot, Hopefully its not a warped head