Car heater and defroster

Tiny
OYESHECAN
  • MEMBER
  • 1993 LINCOLN TOWN CAR
  • V8
  • AUTOMATIC
What is causing my defroster not to work, my heater works one day then the next time it does not. It sounds like its trying to start but can't.
Friday, February 4th, 2011 AT 2:25 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Quickly touch the top and bottom heater hoses, if both are hot, then you may have a diverter valve bad, or blend door.

If both are cool then thermostat, if one hot and one cold then heater core is partially blocked.
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Friday, February 4th, 2011 AT 2:33 PM

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