F150 HEATER NOT WORKING IN COLD WEATHER

1999 Ford F-150

Tiny

1999 ford xlt truck

December, 9, 2009 AT 10:09 AM

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

FOUND 6253 RELATED QUESTIONS

No Heat

37 ANSWERS
5 IMAGES

2 Answers

Tiny

rasmataz

December, 9, 2009 AT 10:17 AM

Check and test the thermostat and the heater control valve

Tiny

JDL

December, 9, 2009 AT 10:30 AM

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

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