I have brought the car to the dealer, who said nothing is wrong with it. I live in Upstate NY and I need my heat and defrost in the mornings, but the car will not warm up. What's worse, is that the heat will ONLY work if my car is moving. If I drive, the heat works fine, but if I stop at a light, or I am going down a hill (not on the accelerator), I have cold air blowing. I am frustrated as can be at this point, because I freeze on my way to work, and I can never thaw my windows before I drive with out scrapping them... even when most other people just let the car run for a bit. Please help.
Change the thermostat and make sure to bleed the system of air when refilling with coolant.You should have lots of heat in a 2005 Elantra at idle or driving.
SOURCE: 2002 Hyundai Accent lost power
the alternator can die out slowly you may have a bad wiring harness too but yes it can die out slowly
SOURCE: 2000 Elantra Overheating
First when vehicle is cold like in the morning check and make sure that the vehicle has enough coolant/ antifreeze in radiator and reservoir. If coolant is need use a 50/50 mixture of water and antifreeze. You will need some time to do this let car run at idle until the temp guage is in the middle NOT+ normal operating temperature. At this point if the thermostat should be in the open position. Let vehicle run and check to make sure that radiator fan comes on. This should come on when guage is about midway/half way. If temperature rises above half going to h/hot and fan doesn't come on, you either have a BAD FAN BAD FAN SWITCH BAD FAN RELAY OR BLOWN FAN SWITCH FUSE. You will need to check all of the following I will help if its needed. If fan comes on and doesn't go off and vehicle continues to get hot even with fan running. Feel radiator hoses and see if the lower radiator hose is cool/cold. If it is you have thermostat that stuck closed. Replace thermostat and fix problem. If all the above is good and vehicle continues to over heat. THE BAD NEW IS THAT YOU MAY HAVE A BLOWN HEAD GASKET /CRACKED HEAD /BROKEN WATER JACKET. Basically you will need a HEAD JOB at least a head gasket. ONe tell tail sign of this is oil looking like milkshake/chocolate milk-a creamish while residue in oil or antifreeze. Contact if you need hel0p. Good Luck and thanks for using FIX YA
SOURCE: 2004 Hyundai Elantra problems after replacing alternator
Sound to me like some wires were either disturbed or crossed and are shorting out maybe when you replaced the alternator?Maybe have a look at the alternator connections again and make sure everything is correct and tight and that the new alternator is the right one for your car.Other than that its a case of tracing the wires from the alternator to the fusebox to find whats blowing your fuse.
SOURCE: ESC light and check engine light
Hi! This has been happening to me too and I also have a 2006 hyundai sonata. Did you get your's fixed?? What was the issue and how much was the repair cost?
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Sounds like a bad water pump. The water pump must have enough force to move the hot antifreeze thru the heater and pull it back into itself thru the outlet of the heater. At idle, the pump may not have enough efficiency to do this. don-ohio (:^)
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