TAKES ABOUT TWENTYTWENTY FIVE MINUTES FOR HEATER...

  • Tiny
  • Anonymous
  • 2002 Hyundai Elantra
  • 69,000 miles

Takes about twenty-twenty five minutes for heater and defroster to heat up! After that time, everything is working great.
temp guage shows normal heat range, etc. Radiator doesn't over-heat. Why does it take so long for the heater and defroster to work?

Thursday, December 13th, 2012 AT 1:46 PM

1 Reply

  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Check the thermostat. If it is stuck open, the coolant would take a longer period to heat up. Coolant would be bypased and not circulating in the heater core.

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Thursday, December 13th, 2012 AT 2:12 PM

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