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
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you have moisture in the system this causes your expancion valve to freeze up an stop working, thats why it works for sort time and when it de-freezes stars working again. you need to do a EVAC & RECHARGE with a good AC service equipment, specially attention to pull vacumm por at least 20minutes so you get all moisture out of the system.
IF YOU HAVE 2.0L ENGINE BELT BREAKS YOU WILL LOSE AC AND DEFROST CONTROLS.WONT BLOW COOL AIR.IF YOU HAVE THE ONE MAIN DRIVE BELT IF BREAKS.CAR WILL LOSE ALL CONTROLS.YOU WILL LOSE ALTERNATOR POWER,LOSE POWER STEERING.YOU WILL POWER ASSIST ENOUGH TO GET CAR OFF ROAD YOU WONT BE ABLE TO VERY SHARP CURVE.YOUR WATER PUMP STOP WORKING.IF BELT LOOKS BAD FIX IT .DONT LET IT BREAK.
Technical Information: When the engine overheats (goes above 220 to 230 degrees), the ECM (Engine Contro Module) will disable the AC (won't let the compressor engage). This is a safety feature of the EMS (Engine Management System) to reduce potential damage to the engine from an overheat condition. Check your coolant level in the radiator & reseviore -- Low coolant level can produce the symptom you describe -- if low, top them off. Inspect your radiator hoses/cooling system for any signs of leakage (crusty deposits of dried coolant). Wherever you find this, that's where it's leaking. If you don't find any signs of leakage, replace the thermostat (& gasket if required (as a precaution) anyway. When the engine overheats, both cooling fans should come ON HIGH! If they aren't/don't, something's wrong and you need to find the cause. Every two to three years the cooling system should be flushed and inspected to ensure proper operation/condition and system protection. Overheating can seriously damage the engine. $$$$. An ounce of prevention is worth a pound of cure.
Sounds like the waters not flowing correctly could be thermostat or other blockage.Are radiator fans working when vehicle is at operating temperature?Generaly this is a thermostat fault or faulty temperature sensor.