One possibility is that the air conditioning is on. My 2001 Elantra automatically starts the air when the fan setting is put to defrost. I have to remember to turn it off.
the ac stoped working and so did the heat . I changed the thermostat added freant
A simple way to check the air conditioning on a 2003 Hyundai Elantra is to turn on the unit in a car. If the air will not blow cold or at all the an the AC system will need to be looked at.
Check the battery in the remote.
Debris in the hoses or reservoir could cause the motor to overheat. Also, running the pump without fluid could do the same.
Possibly a fan resistor. Does it work on only certain speeds like 1 and 2 but not 3 and 4?
If the AC was working well yesterday and blowing cold, however, today their is no air being released, the AC could have been too high for two long. The AC tends to freeze up and has to be turned off for a while until thawed. If the blower motor and resistor needed replacement they may have officially blown and need replacement in order to work at all.
I Had the same problem. Found answer here:http://www.2carpros.com/topics/airbag.htm Basically, it is the voltage regulator causing a voltage spike and blowing the lights and causing an airbag issue. I haven't yet fixed the problem but seems to make sense with the symptoms I had (bright flicker before lights went out).
Its #1 cause
Bad temperature sensor unit? Cooling fan not working? Water pump not circulating coolant? Radiator plugged or restricted? System airbound? Thermostat not opening?
Your speed sensor might be broken. Check it for rust or broken plastic part that would let water get in. Usually means you need to replace.
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blowing things up.