2002 Ford F-150 heater core problems

Tiny
DAVE2984
  • MEMBER
  • 2002 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
Hi I have a heater core problem I think it's airlocked cause my temp either goes hot or cold how do I remove an airlock from the heater core.
Friday, June 13th, 2014 AT 7:34 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Make sure the coolant is full, loosen the return heater core hose and start the engine with the heater on high. Allow air to exit and coolant to come out.

Are you getting any heat from the unit?
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Friday, June 13th, 2014 AT 8:02 PM
Tiny
DAVE2984
  • MEMBER
  • 24 POSTS
Yes it works sometimes my heater gets really hot but I never can get it to go at a normal temperature it's either to hot or too cold but could their be another problem with it instead of the heater core making my heat jump from hot to cold and never normal temperature
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Friday, June 13th, 2014 AT 8:28 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Usually, when there is an air block in the heater core, you don't get heat. So, I don;'t think that is the issue. Have you checked the thermostat? When does this happen, at any speed, in town driving, highway driving? Have you confirmed that not only the over flow jug is full of coolant but also the radiator? Have you checked the fan clutch to make sure it is working?
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Friday, June 13th, 2014 AT 8:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
After thought. When you say it gets real hot or real cold, do you mean the temp gauge drops off to 0? And then shows overheating? Has the vehicle ever truly overheated?
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Friday, June 13th, 2014 AT 8:32 PM

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