Question about 2003 Ford Expedition

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All the air from the heater or ac come off through the defrosters

All the air from the heater or ac goes through the defroster duct. the rear air works fine. and it does it through all the setting on the dail.

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You have a vacuum leak going into the truck. On your dash there is a knob that allows you to go from floor to dash to defrost. This knob is controlled by vacuum from the engine. The default position for the HVAC system is the defrost setting. There is a small black tube (about 1/4 inch in diameter). Pop the hood and look on the passenger side of the engine compartment near the fire wall. This is where this vacuum line usually runs through into the cab. If you can not see any line going into the cab then start tracing all the smaller lines (1/4") coming off of the engine. There will be red, green and black ones. The red and green ones are mainly for emission control. If you trace then out you will find the one with the problem. it will be broken, kinked or perhaps disconnected. 

Posted on Nov 16, 2008

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1 Answer

Selector for air mode stuck on defrost


This is caused by a low engine vacuum, the engine vacuum is low when you accelerate, the HVAC system loses vacuum to the mode control vacuum switch and defaults to the defrost ducts for safety. You likely have a leaking mode control vacuum switch in the control panel of the heater AC system (HVAC).

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LEGEND
1 Clip
2 Dust and Pollen Filter
3 Air intake housing
4 Defroster air outlet
5 Side window air outlet
6 Heating and A/C controls
7 Air outlets
8 Instrument panel cross member
9 Defroster duct
10 Servo motor for fresh/recirculating air door -V154-
11 Ambient temperature switch -F38-
12 Gasket
13 Evaporator water drain guide
14 Heating and A/C unit
- Heater core
- Evaporator
15 Fresh air blower -V2-
16 Fresh air blower series resistance with fuse -N24-
17 Center air outlet
18 Control panel trim
19 Center trim
20 Heating and A/C cables
21 Heater core
22 Left rear duct
23 Lower duct
24 Upper duct
25 Footwell air outlet
26 Instrument panel cross member, left side member securing bolt
27 Relay
28 A/C cut-off control module -J314-
29 Instrument panel
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1 Answer

The heater stays on the floor will not go to defrost


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Could be faulting acutar motor for the hot air door. stocks5958.gif (1) Heater Core Cover (2) Heater Core (3) A/C Defroster Seal (4) Upper HVAC Module Case (5) Dash Seal (6) A/C Valve (7) Heater/Defroster Valve (8) Temperature Valve (9) A/C Valve Lever (10) Mode Valve Actuator (11) Heater/Defroster Valve Lever (12) Mode Valve Cam (13) Lower HVAC Module Case (14) Rear Heater Duct Seal (15) Temperature Valve Actuator Screw (16) Temperature Valve Actuator (17) HVAC Module Wiring Harness (18) Blower Motor Resistor/Relay Assembly (19) Blower Motor Acoustic Insulator (20) Blower Motor (21) Blower Motor Fan (22) Passenger Compartment Air Filter Access Door (23) Dash Seal (24) Evaporator Block Seal (25) Evaporator Core (26) Passenger Compartment Air Filters (27) Air Inlet Valve (28) Air Inlet Housing (29) Air Inlet Housing Seal (30) Air Inlet Actuator (31) Heater Core Pipe Seal

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check the vacuum line going to the cotrol panel in the dash. it could be broken or the plug on the back of the panel came off. the line usually breaks under the hood

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I have a mercury mountaineer 2003 V6. It has a problem of making sound repeated when I want to have heat turned on. No sound when the dashboard A.C/Heat stays at AC level, which is the zero? level. The...


When the engine is cold,check the coolant level.

Make sure it's on max.

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A coolant system should be flush every two years.

===

If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.

The DIY method is to drive you car onto a ramp or a steep hill.

Iet the engine cool off and top off the coolant tank.

Set MAX heat + MAX fan

Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,

Check coolant level and top off coolant when the engine cools down.



A shop will charge $75+ for this but using an air operated excavate tool!

========

A car with over 90K miles may experience linkage problem to the heater control valve.

The heater control valve (near the firewall) may be stick over time.

Open the hood and move the heater to max and min. Back and forth.

Clean and lube the linkage with WD-40 to free the heater control valve.

If it's a vacuum type heater control valve then cash for leaky vac. hoses.


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Move the fan switch back and forth to re-new the electrical conductors.

Pass a vacuum over the control panel to prevent dust build up behind the console.

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1 Answer

Air only comes out of defroster duct. Will not


vacuum hose or motor. Find a junkyard and replace if you are comfortable doing so. if not your heater controls are busted. Also check first if there are related fuses, as this is sometimes the case.

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4 Answers

Climate controls


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