Heater works when engine is running at high rmp's but cold otherwise

Tiny
HBBOLDING
  • MEMBER
  • 2004 HYUNDAI ELANTRA
  • 126,000 MILES
I have a 2004 Hyundai Elantra. The heater will put hot air out at high RPM, but cold air at low RPM. The check engine light came on, had a code of 128. I replaced the thermostat and engine coolant sensor, had the light turned off. 4 days later, the engine light is back on with a 128 code. Heater, same condition as above. Do you have any suggestions as to what the cause is?Thank you in advance.
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Wednesday, December 28th, 2011 AT 11:08 PM

3 Replies

Tiny
HMAC300
  • EXPERT
Check to seeif your coolantlevel is full. A low level will caue the code you are having. It may have worked airout of the sytem and dropped the leve of coolant. That could cause your heating problem.
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Wednesday, December 28th, 2011 AT 11:14 PM
Tiny
HBBOLDING
  • MEMBER
Water level is where it is supposed to be
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Thursday, December 29th, 2011 AT 11:48 PM
Tiny
HMAC300
  • EXPERT
You'll have to have it check ed to see if there is abad connection, corrosion or a wire chafed and rubbing someplace.
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Friday, December 30th, 2011 AT 4:15 PM

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