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Ford F-150 Heater Not Working?

February 10, 2018

My 2002 Ford F150 blows barely warm air. I have flushed the fluid, changed the thermostat, and checked blend door operation, but no change. The upper heater hose is warm, but I still do not get heat regardless of the RPM of the engine, no heat. The A/C works perfectly.

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February 13, 20180 found this helpful
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I'm thinking there is air in the system like my Lincoln. I ran the front end up on ramps then loosened the reservoir cap. Then I squeezed the upper radiator hose and the air bubbled up into the reservoir. Refill the reservoir fluid to level. Tighten down the cap. Or, don't always trust the new thermostat. I have returned so called new ones because they were defective.

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16 More Questions

Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

November 8, 2014

I have a 1994 Ford 150 truck. The heater barely gets warm air into the truck. I have had the heater core and radiator flushed. What else should we do?

By Dixie M.

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November 9, 20140 found this helpful
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Try changing the thermostat and double check the heater hoses to make sure they are not clogged. Also, there may be a vacuum operated valve in line with the heater hose that turns the heater off when the air conditioning is in use.

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These sometimes stick partially closed and have to be changed. Good Luck and God Bless.

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December 11, 2016

I have a Ford 2005 F150 with no heat. I changed the resister and the blower motor. When I turn the dials I hear something moving, but no heat. Can someone please help?


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Anonymous
December 12, 20160 found this helpful

Thank you very much. I will check

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August 16, 2020

I have a 2011 Ford F150. The heater/AC fan is turning off and intermittently running. The AC goes off. If I turn the switch off and wait 5 - 10 minutes it works for a short time and then shuts off again.

Any ideas?

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Bronze Post Medal for All Time! 105 Posts
August 16, 20200 found this helpful
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A lot of times this could deal with the radiator in the truck, the cooling fan, or the fan belt. If you are having this issue check to make sure the fan belts are working correctly and there isn't a problem. Also, check the cooling system of the truck and make sure you have enough cooling fluid in the motor.

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Then if this is still an issue you'll need to get a voltmeter and start to trace the wires under the dash of the truck. You could have a short in one of the wires or there is a major issue with the fan in the truck. If the truck is not cooling normally and running hot this can cause your problem.

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September 27, 2014

I have no heat in my truck. I have flushed the heater core and still no heat. I did change my thermostat and both hoses are hot going in and out of the core, but it is not blowing heat in the truck.


By Mike

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December 16, 20141 found this helpful
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I've got a 2000 F150 with the same issue. I am flushing the heater core this weekend as I believe I have a partially clogged core.

Also, I'm doing the air blend door actuator, sounds like the air blend door actuator may be your issue.

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It's a $30 part you may pull yours off and check that. It's located behind that black panel, down where your air for your feet comes from. It's black and white, if you need I can send you a pic.

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October 4, 2017

My Ford F-150 stop blowing a/c and heat. The blower still blows, but just air.


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Bronze Post Medal for All Time! 105 Posts
October 4, 20170 found this helpful
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Here are a few things that you should check:

  1. Check your heater core. See if you need to replace this. Make sure you it is getting warm.
  2. Check all your heater and AC hoses. Some might need to be replaced.
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  4. Check the vent to the core. This vent needs to be opened to allow the hot air to blow into the cab of the truck.
  5. Check the cable on your inside adjustment for the AC and heater. It is behind the knob that you adjust. Make sure the cable is attached and not broken. This cable goes to the mixing value which goes to the heater core and allow the hot air to flow through.
  6. Check the white vacuum line underneath the hood on the passenger side. Make sure the hose isn't cracked or broken. This goes to the cylinder in the back firewall of the truck. Follow the hose back to the firewall and cut it off. Buy a new hose that is a 5/32 vacuum hose around 20". This will slide into the cylinder and the other end to what is left on the harness.
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October 17, 2013

My 2001 Ford 150xl v6 heater was making a flapping sound for awhile and has stopped. It stopped blowing heat, but would work by tapping the heater now there is no heat. What is the problem?

By RD

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December 2, 20130 found this helpful
Best Answer

Check your heater blend door motor.

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February 5, 2017

The heater fan motor on my 1993 F150 runs, but no air comes out of floor vent, defrost, or panel vents.


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January 7, 2016

I have a 2004 Lariat F150. My blower is working fine, but my temp will only work at 90 degrees for the heater and the cold air is working fine. Can anyone tell me what the problem is?


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Gold Post Medal for All Time! 677 Posts
October 1, 20170 found this helpful

Some reasons the heater may not be working.

  • Low coolant level on a vehicle due to a coolant leak
  • Thermostat that is stuck open.
  • Plugged or leaking heater core.
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  • Heater blower that is not functioning.
  • Blend doors that are not functioning
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February 17, 2015

I have a 2009 Ford F-150. My heater does not blow hot air when the heater is on. The blower is working fine. Air comes out both sides. The driver side is just a little warmer than the passenger side.

By Allen B.

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February 18, 20150 found this helpful

You might be able to get an answer at this site:

www.fordf150.net/.../viewtopic.php?f=71&t=104715

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December 24, 2014

My 2009 Ford F150 4x4 is blowing only cold air with the heater on. Any suggestions on what the problem could be?

By Karen

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Bronze Answer Medal for All Time! 220 Answers
December 25, 20140 found this helpful

Suggest you contact a Ford dealer, mechanic, Ford online customer service.

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January 17, 2015

I have a 2001 F150 Ford pickup. The heater blower only works on the high setting. What is wrong?

By Jim

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December 27, 2014

I have a 2009 F150 truck, the right side works fine, it blows hot and cold, but the driver's side only blows hot; it won't switch to cold.

By Vernon from Lebanon Junction, KY

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April 9, 2014

I have a 2000 Ford F-150. The heater is not blowing air out of the vents. I changed the heater core, switch, and resistor. It did not fix anything. I can feel heat and cold air barely coming out of openings, just not blowing it out.

By JMcc

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March 20, 2014

I have a 2009 Ford F150; all I got is cold air, no hot air. What could be wrong? Please help.

By Tina

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December 17, 2013

Why does the air in my 95 F 150 only come out of defrost vent no matter where the air directional knob is?

By PFC from Elkridge, MD

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November 25, 2013

My 2011 F150 blows hot air on the passenger side, but cold on the driver side.

By Wes

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