Hyundai Motor 2003 Sonata Logo

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Posted on Oct 21, 2009
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How do you remove the dash to get to the heater core on a 2003 hyundai sonata?

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PAUL MC G

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  • Master 1,280 Answers
  • Posted on Nov 04, 2009
PAUL MC G
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Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.

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Why does my radiator become empty after 30 minuets of driving and water appears on the driver side floor?

Your heater core is leaking, bypass the core by removing hoses from firewall and joining together, or cable tying over, this will get you back on the road until you can replace the heater core.
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Your heater core is leaking. Will not defrost because the moisture leaking out of the heatercore is just refogging up your windows. Replace the heater core. Feel your floorboards, espically the passenger side and see if its wet. Check and see if coolent lvl is low. Im 98% sure if you let your engine get to operating temp, and get down in the passenger floorboad and look up under dash, you will see the coolent spraying/leaking out. Sorry to be the bringer of bad news, they are always hard to replace.
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Check for a blockage in the heater core itself. (You may need to flush it out). If that does not fix it, then look at the heater control head on the dash or the blend door within the environmental control box.
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either the flap on teh heater under the dash or the core needs a flush with the garden hose ,but the most likely cause is the flap operating cable if fiyyed or the vacumn operating device ,Iam not sure if this model is cable or vacumn though but i think the fault lies here more than it being blocked
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