My 2005 hyundai elantra wont start

This is the most likely reason

https://www.fixya.com/cars/r29872074-vehicle_cooling_system_no_heat

It could also be seized blend door actuators not directing the hot air. Or the switch unit.

https://www.google.com/search?q=2003+Hyundai+Elantra+heater+does+not+work

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check to make sure the blend door is changing from cold to hot. With the engine off and the key in the run position set the blower motor to the highest speed. Turn the temp dial to full cold and wait 30 seconds. Now turn the temp dial to full hot a listen carefully. You should hear a difference in sounds as the blend door sweeps through its full range.

If it is working and the engine is fully warmed up feel the heater hoses where the pass through the fire wall. One should be very hot and the other should be pretty warm. If one is hot and one is significantly cooler than either the heater core is plugged or there is air in the heater core causing a block in flow.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I would return it to the installer

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are the 2 heater core hoses getting hot.

you are low on antifreeze. fill and check for leaks

2 things it maybe. Your blend door may be stuck open. 2nd Your heater core may need replacing. Check to see if both heater hoses are hot. 3rd heater control valve maybe bad. Good Luck!!!

First you have to determine if its fuel or fire. To check for fuel spray a few seconds of quick start into the air intake. If it starts and then stops. its likely a problem with fuel. If it doesn't start its likely spark or battery problems. Does it turn over?

start with a thermostat...

sounds like the heat blend cable is either dislodged or frozen, the cable runs from the control head to the blend door located on the drivers side just above the gas pedal ,it is not an easy job to replace, i sugest to take it to your local dealer, its not that costly and they will know exactly what to fix.

my 2002 elantra gls sedan started blowing hot air and overheating and it turned out when i took it to the hyundai dealer it was my thermostat they replaced it and i was good to go.it happened at about 40,000 miles hope it works out for you