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No heat in the interior of the Pickup truck CAB?

Tiny
DMYNARD
  • MEMBER
  • 1998 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 199,000 MILES
I have had the heater core, radiator and engine flushed. Having had a 195-degree thermostat installed of course with new coolant. I replaced the temperature control switch on the dash panel. I have also cut a hole in the blend door housing and visually checked the operation of both the actuator motor and blending door both work fine. The temperature of both heater hoses at the fire wall is around 156 degrees. I still have no heat in the interior of the pickup truck cab.
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Wednesday, March 4th, 2015 AT 10:18 AM

2 Replies

Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
Remove the two heater hoses from the heater core and blow through one of them and see if the heater core is plugged? They heater hoses may be heating up from the opposite direction instead of circulation
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Wednesday, March 4th, 2015 AT 8:49 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Also 156 degrees is not hot enough, you have a defective thermostat. Please go over this guide as well:

https://www.2carpros.com/articles/car-heater-not-working

Please go over this guide and get back to us.
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Tuesday, April 9th, 2024 AT 12:50 PM

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