IT HAS A NEW HEATER CORE IN IT. I CHANGED THE THERMOSTAT IN IT CAUSE IT WASN'T GETTING VERY WARM . NOW ALL I HAVE IS COLD AIR !! TOOK OF THE RADIATOR CAP & RUN IT FOR ABOUT 45 MINUTES. STILL NO HOT OR EVEN WARM AIR !!! SOMEONE SAID MAYBE TO BACK FLUSH IT. HOW DO YOU DO THAT !! OR ANY OTHER SUGGESTIONS WOULD BE GREATLY APPERCIATED
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Re: I HAVE A 1999 HYUNDAI ELANTRA !!!
What is the temp guage reading. Is the engine running at its normal temp.Make sure you purchased the correct thermostat. Is the rad full of water?The system may have air in it.The vent door may not be closing. Check these things out and post what you came up with
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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.
Most likely the thermostat broke. I expect that you have an older Hyundai and never had the anti-freeze changed. When the engine is cold the thermostat is closed which causes the engine to warm up more quickly. A warm engine runs more efficiently (less gas) and more smoothly. When the engine temp reaches a certain temp the thermostat opens and then allows the hot engine coolant to run through the lines to the heater core. The heater blows air over the heater core which produces the warm air that warms up the cabin. Thermostats used to be cheap and easy to change. I would suggest a web search for how to replace the thermostat. Something like 'hyundai accent 2002 replace thermostat".
The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".
When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.
You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.
If the temperature is fluctuating up and down, you should have it fixed. Good luck!
When the coolant flush was done, did you have the thermostat changed as well? I would have the thermostat replaced. If the temperature gauge was reading properly, but you still had warm, not hot air, it would lean more towards the heater core being clogged, but that deosn't seem to be the issue your having, so i would go with the thermostat replacement. And whereever you have the repairs done at...make sure they fully bleed all the air out of the cooling system, this could also cause poor warm-up / heating problems. Hope this helps...
this could be many different issues. you could have a lower degree thermostat, if the block wasn't boiled and flushed you could have coolant restriction in the block causing less flow to the heater core,or you could have put your heater core hoses in reverse flow.
Your thermostat may not be working properly. Coolant flows thru your heater core where the blower motor blows that heat from the coolant thru your vents. If the coolant is not warm enough wich is a sign that your thermostat may be stuck open or opening too soo, your air may be colder than normal.