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The defrost mode is constantly on...we have power but no air

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Is the fan motor running?

Posted on Nov 14, 2014

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2008 RAV4 defroster doesn't clear windows at temps below freezing


front or rear defrost?
what windows, there are many, front windshield?????
front:
dont use RECIRC mode. use fresh air, only
and make sure the dampers are in fact sending hot air to the windshield. if the dampers are not working it needs service
or a simpled blown fuses in the fuse box.
also, the car can have water engress. are the any damp spots
on the carperts. anywhere.?
are you using the A/C defrost mode, does it work.
do you know how to tell, its easy, check A/C mode.
A/c is also a dehydration system for the whole cab, it even ejects
water to the ground as you drive.

Jan 18, 2014 | Toyota RAV4 Cars & Trucks

1 Answer

My front defrost wont work


If the moisture is oily, your heater core could be leaking.
If the moisture is dry, check to see if your ac compressor is running in defrost mode.
The air cond dries the air in defrost mode.

Feb 21, 2013 | 1996 Honda Accord

1 Answer

1990 corvette can't change air vent from defrost mode


The mode door defaults to defrost when it loses vacuum. I would start by checking for cracked/ loose vacuum hoses in the engine compartment.

Mar 18, 2012 | Chevrolet Cars & Trucks

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

Dec 28, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Heat does not come out passenger side of the car but comes out drivers side


There is a blend door problem.

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prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

Oct 28, 2010 | 1998 Oldsmobile Regency

2 Answers

I changed the battery on 2006 Trailblazer SS. Now I can only get AC from my windshield and floor vents. Nothing from the dash vents. Also the temp control only gives coldest temp. I have checked fuses...


once you disconnect the battery your body control module loses power and memory you have to get some one with a scanner with reprogramming capabilities and have the computers reset ,dealer?

Aug 05, 2010 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

Defrost blows constantly? How do i fix it?


does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.

Feb 13, 2010 | 1994 Chevrolet C1500

1 Answer

2007 F-150 Supercrew Lariat Cabin Air Filter


According to the shop manual you do not have one.
Air Distribution and Filtering adobe.gif Printable View (79 KB) NOTE: The air distribution system of this vehicle cannot be equipped with a cabin air filter.
There are 2 sources of air available to the air distribution system:
  • Outside air
  • Recirculated air
Recirculated air is automatically used when the electronic manual temperature control mode selector is set in the MAX A/C or OFF modes and can be selected in any mode other than MAX A/C, OFF or DEFROST by selecting the RECIRC button. Recirculated air is available in all modes except DEFROST. If the vehicle is equipped with an electronic automatic temperature control (EATC) system, recirculated air is used in OFF and is available in all modes except DEFROST. RECIRC mode is a timed function in FLOOR and FLOOR/DEFROST.
Air distribution within the vehicle is determined by the electronic manual temperature control (EMTC) function selector switch position, or is controlled by the EATC system in the AUTOMATIC mode. The air distribution mode on EATC vehicles may be overridden by the driver if desired. Air distribution doors are used to direct airflow within the heater core and evaporator core housing and the plenum chamber. An electronic mode door actuator is used to position these air distribution doors. One air inlet mode door is used to switch between FRESH or RECIRC air inlet. An electric actuator is used to position the air inlet mode door.
Air enters the passenger compartment from the:
  • instrument panel A/C registers.
  • heater outlet floor ducts.
  • windshield defroster duct.
  • side window demisters.
  • center flow-through console (if equipped).
Passenger compartment air is exhausted from the vehicle through open windows or body air vents.

Mar 08, 2009 | 2007 Ford F-150 Harley Davidson

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