1999 FORD F150 HEATER NOT WORKING IN COLD WEATHER

  • Tiny
  • 1999 ford xlt truck
  • 1999 Ford F-150

Heater problem
1999 Ford F150 V8 Two Wheel Drive Automatic 145000 miles

in the summer heater works fine. In winter the heater blows cold air only. Replaced thermal switch on dash board. Checked heater core hoses under hood they are both hot when engine is at normal op. Temp.
signed, cold feet

Do you
have the same problem?
Yes
No
Wednesday, December 9th, 2009 AT 10:09 AM

2 Replies

  • Tiny
  • rasmataz
  • Member

Check and test the thermostat and the heater control valve

Was this
answer
helpful?
Yes
No
Wednesday, December 9th, 2009 AT 10:17 AM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

Welcome to the forum, I'd have to check the blend door in picture. With the blend door in one position, ac, other position, the air has to go through the heater core.


http://www.2carpros.com/forum/automotive_pictures/170934_blend_doors_1.jpg

Was this
answer
helpful?
Yes
No
Wednesday, December 9th, 2009 AT 10:30 AM

Please login or register to post a reply.

Similar Questions