Question about 2003 Ford F150 Regular Cab

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The heating unit blows air from defroster and floor only

Cant find actuator/servo for air mix.

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Defrost is a default if vaccum is lost from engine.. check behind batt in engine comp to see if batt has been leaking. this can cause the acid to drip on small black vacc lines from engine and cause a leak in the vacc system causing it to only blow in defrost . you can fix by cutting damagged vaccumm line and install a small rubber hose over cut ends .. the vaccum lines run between batt and fire wall

Posted on Mar 11, 2009

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1 Answer

My air condition and heat works on defrost only sometime comes out vents last seconds didn't matter were controller set


Not sure what year, make or model vehicle is in question, but the issue is due to an actuator that has gone bad. Sometimes referred to as a mode actuator or blend door actuator. This actuator controls where air/heat will blow from (defroster vent, forward vents, floor vents or combo, etc.). Good luck. Ron @ Speed-O-Repair.

Aug 24, 2014 | Cars & Trucks

1 Answer

95 TAHOE. blowing hot air from the floor no matter what i have it set to. Will cool off if i turn a/c to max. but it's annoying , and keeps the cabin hot. Both a/c and heat work, and I'm also able to...


there is a gate in the air duct plumbing that routs the air through a small radiator to heat the air for the heater, being that it's a '95 model it could be either button control (servo motor on the gate) or cable control.
which ever it is, that gate is not being actuated

Sep 06, 2013 | Chevrolet Cars & Trucks

1 Answer

Air conditioner


sure.

what is your goal hot air, you never said,

got full fan speed? on high>? sure.
got full engine coolant heat 180F or more holding??? if not all is lost.
if car has a heater core water valve is it open>?
are the 2 heater core water tubes both fully hot,(hand test)
yes> good.
now you need air flow through the core (heater)
that means the damper most be open,, is it?

in that order. (heat)
the dampers on hondas can be complex. (10x on electric damper motors , aka, damper actuators)
see part 5 and 6 here
http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=ACCORD&catcgry2=2002&catcgry3=2DR+EX&catcgry4=KA4AT&catcgry5=HEATER+UNIT

the fSM covers the complex tests of dampers, and not having
a real FSM makes this near impossible.
why , because your dampers are no like anyothers on earth.
other cars use different types. and are all unique .
unlike CABLES
unlike vacuum servos.
see>?

here are the basics for heat.
http://www.fixkick.com/AirCond/heater.html


Jun 04, 2013 | 2002 Honda Accord

1 Answer

Air only blows out the bi-level, won't switch to defrost or floor


The air diverter door in the heater/AC case is not moving. The cause could be anything from a stuck door to a bad vacuum line, bad servo (door actuator), or the rotary switch on the control panel.

Apr 21, 2013 | 2006 Dodge Grand Caravan

1 Answer

Is the correct name for the part that controls the air flow from a/c to defrost called the A/C Heating Servo Unit, the defrost does not completely defrost the front windshield but the a/c works just f


Well it would be the "mode door GM pt#88986538" or the "mode control cam actuator GM pt#89023358" on the side of the heater case. The door would control where the air comes out and the actuator tells the door where the setting is at on the control head.

May 14, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

2004 Pontiac Montana blows cold air in defrost


There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!

Dec 22, 2008 | 2004 Pontiac Montana

2 Answers

Heater only blow out the vents


There are servos that move air control gates, some were controlled electrically, and some were vacuum. It sounds like there's a vacuum line off the vacuum reservoir under the hood, or a vacuum line has came off one of the servo diaphragms.

Dec 16, 2008 | 2005 Pontiac Sunfire

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