Question about 2003 Ford F150 Regular Cab

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Not much air is blowing thru vents when the a/c is on max, u can hear the fan blowing hard,this is a 2003 f-150,,is there a vent flap between the fan and the a/c heater core? if there is a blockage between them?

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  • DillyWackSac
    DillyWackSac Sep 06, 2010

    Is there any air flowing through the defrost vents on top of the dash right next to the windshield?

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You may have a cabin air filter. check your owner's manual for service directions. Or the air inlet is clogged with leaves or other debris.

Posted on Sep 06, 2010

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

Nov 14, 2016 | Cars & Trucks

1 Answer

No heat coming out of vents when blower is on


hi, you say there is no HEAT coming out when blower is on .. is air being blown out of the vents? .. if YES, cold air, then the problem may be an air lock/ a valve stuck closed/ or low coolant .. could be a problem with the air conditioning controls. If NO AIR blowing out of the vents and you can hear the fan blowing then investigate, controls to open and close vents, or possibly disconnected ducting .. if the car has been stood a long time it could be sticking vent/door/flap .. search internet for diagram of heating system for more information.

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2 Answers

Cant get enough airflow to defrost windshield fans blowing max


Either the damper door is not redirecting air flow OR your air duct clogged with debris. If you get great air volume thru all the other vents I would believe the problem is with your damper not functioning properly.

Jan 25, 2012 | 2002 Kia Spectra

1 Answer

Jeep AC blows cold air at defrost and feet but not through vents


There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.

Jul 01, 2009 | 1999 Jeep Grand Cherokee

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Why is my ac not blowing hard thru the vents?


check vacuum lines under hood for leaks

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2003 Trailblazer Air Conditioner fan runs but no air out vents


thereis an actuator controling the flap t may be cracked causing the problem

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1 Answer

AC blowing heat and air at same time


Yeah Ron, the flap that covers the heater core is open and when you're moving the air is pushed over the heater core and into the cab your in. Possibly just a vacuum line of that controls said flap. Check all vacuum lines for good proper connection to these flaps because all of them are vacuum actuated.

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2 Answers

Astro van 1997


There is a flap in your heater box that is controled by your vent switch by your heater controls. listen for a vacuum leak. that is common and hopfully the problem. there is vacuum lines that control the vent door that redirects the air to your vents.

Has your dash been messed with recently? if so i would check there first. you should hear a hissing if thats the problem.

Otherwise these also are common for that door flap to break and not switch NE more. thats the only 2 things that i can think of off th wtop of my head to be the problem. this would require the whole dash to come apart if its this problem

Michael
ASE certified

Feb 22, 2009 | 1999 Chevrolet Astro

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