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I have a 98 Kia Sephia. When I turned on the heater it blows cold air and smoke came from underneath the hood while the heater was on. Turned the heater off and car. After a while off it stopped smoking. Tried turning the car on again it worked but haven't tried the heater again since. What could this be?

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  • Cars & Trucks Master
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Check to see if you have lost antifreeze. If the coolant reservoir tank is low or empty, check the radiator, but wait till the car has cooled down before opening the radiator cap. Low coolant level is sometimes the cause of poor heater performance, but your car may have a leaking heater core or hose. Feel the hoses for any wetness-they are behind the engine and enter the firewall behind the engine. The coolant may have got on the hot exhaust pipes and caused the smoke. But you will have to check for that or for what caused the smoking, when the heater was turned on. First check the coolant level and add a pre-mixed 50/50 solution of antifreeze and water if needed.

Posted on Dec 09, 2012

  • StevenC Dec 10, 2012

    Thank you for responding to my post. The coolant reservoir is ok, no loss in antifreeze, radiator okay. Most likely I do have a leaking heater core and hose. I will keep you updated.

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I had the same problem, started about 150K miles. It had nothing to do with the fan motor or the switch. my problem was under the fuse box. it was shorting out and i couldn't figure out how to get the wire out or wedge it in to where it would hold, so i got an external inline fuse and bypassed fuse box. when doing that it bypassed the relay as well. by hey, the fan blower works now.

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will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks

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SOURCE: 2002 KIA Sedona Overheating

most likely, replace thermostat .

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SOURCE: heater blows cold air

the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation dodgeboy6069@yahoo.com

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