Question about 1998 Toyota Corolla

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2009 Corolla defroster

I am trying to find out how to defrost my windows without having to open the outside air vent. I just about gag in stop and go traffic when I have to defrost the windows yet the diesel fumes make me want to gag.
Any suggestions?

Thanks

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1 Answer

My windows are not defrosting properly.


Do you have heat? Does the fan turn on? are you getting air from the defroster vents close to the windshield? If you have heat make sure the defrost control is working. I'd open the outside air vent and turn the blower on high speed. If there is no heat, the heater control valve is not working. Double check the radiator fluid tank, make sure you have enough fluid (antifreeze) Low fluid levels can reduce the hot water flow to the heater coil inside the car. If there
is no air flow through the defroster vents you may have a problem with the fan control, or the fan motor. Good luck.

Feb 20, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Where is the " Outside " air vent located? the " circulation " button is for " inside " air only.


Normally the system pulls outside air in unless you select defrost or push the "circ" button to override the system. The outside air comes in from the area in front of the windshield.

Sep 05, 2014 | 2001 Pontiac Bonneville

1 Answer

Poor air flow through defroster vents


Got kids? Years ago, mine loaded the defroster ducts with toys, candy, etc.
Otherwise, please create another post and identify the year, make and model vehicle you're talking about before posting your question.

Oct 13, 2017 | Cars & Trucks

1 Answer

Air conditioning will not switch from defrost vents


Vacuum control motors are used to position these airflow control doors.
SECTION 412-01: Air Distribution and Filtering 2000 Expedition/Navigator Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/17/1999 Air Distribution There are two sources of air available to the air distribution system:
  • outside air
  • recirculated air
Recirculated air is only used during MAX A/C, AUTOMATIC (if equipped with EATC) and OFF modes.
Air distribution within the vehicle is determined by the function selector switch position, if equipped with manual A/C, or is controlled by the electronic automatic temperature control system in the AUTOMATIC mode but can be overridden by the driver if desired. Airflow control doors are used to direct airflow within the heater air plenum chamber. Vacuum control motors are used to position these airflow control doors.
The air distribution system is designed to provide airflow from the defrost nozzle when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak.
Air enters the passenger compartment from the:
  • instrument panel A/C registers.
  • heater outlet floor duct.
  • windshield defroster hose nozzle.
  • side window demisters.
  • rear seat airflow duct (if equipped).
Passenger compartment air is exhausted from the vehicle through open windows or cab air vents.


expedition air flow hvac system-xvcmtr1jbqa4kfrdszeh0lpe-3-0.gif Item Part Number Description 1 18A318 Vacuum control motor - panel/defrost door 2 18A478 Panel/defrost door (full vacuum position) 3 - Defrost airflow 4 - Side window demister airflow 5 18B545 Temperature blend door (full heat position) 6 19860 A/C evaporator core 7 19A813 Air inlet duct door (full vacuum position) 8 - Outside air inlet 9 18A318 Vacuum control motor - air inlet duct door 10 - Recirculated air inlet 11 19805 Blower motor 12 - Vacuum to emission control 13 - Vacuum from the engine intake manifold 14 19A563 A/C vacuum check valve 15 19A566 A/C vacuum reservoir tank and bracket 16 19B888 A/C-heater function selector switch 17 18476 Heater core 18 18A559 Floor/panel door (full vacuum position) 19 - Floor airflow 20 18A318 Vacuum control motor - floor/panel door 21 - Panel vent airflow
Check vacuum control to the panel defrost motor ( vac,diaphragm )

Nov 01, 2017 | 2001 Ford Expedition

1 Answer

I turn on heater and it sounds plugged when on front defrost? When I turn it to the feet it seems to work fine. Does not defrost front window while set that way. Where can I look. It is a 2009 Saturn...


There is internal vent flaps in the venting system to direct the air flow. The flaps can get stuck in one position. Sometimes the little motors that move the flaps can go bad. I would try to manually move the vent flaps. Pain to get to though as you have to pull some venting apart to access it.

May 14, 2011 | 2009 Saturn Aura

2 Answers

Ice formed on outside of line!


try running the air conditioner in defrost mode. set the temperature to warmest while air conditioner is on, for about two minutes. then slowly move the lever towards cold, all the while having the vent set on outside air. once you move it toward cooler, move the vent switch towards recirculate from outside air.

when you have it on defrost, open the engine hood and push the air conditioner button. watch the lines and see if they begin to build frost. if not, move the slider toward cold a little bit at a time while watching the lines to see if they begin to build frost. if they do start to build frost at any point after running the defroster in A/C mode for a bit, you can always try positioning the temperature control towards the middle or run only the outside instead of recirculating vent.

Jan 18, 2011 | 1998 Ford Escort

1 Answer

Why my window is fogging whe i turn the heater ?? i recently bought my toyota carina 3 model 1994 but the window is fogging , what should i do?


Make sure the vent system is set to draw air from outside. If it is set to recirculate the same air that's inside the vehicle without drawing fresh air from outside, the resulting humidity that builds up inside the vehicle can fog the windows even when you run the defrost. You can also try opening the windows a bit to get some more air moving inside.
If it still fogs when the vents are set properly, you may have a leaky heater core. The heater core is a small radiator that is located under the dash that the heater system blows air through to heat the inside of your car and provide heat to defrost the windshield. The fog may be coming from the heater core leaking hot coolant steam that's being circulated through the defrost system. If this is so, you will need to replace the heater core.

Jan 07, 2011 | 1997 Toyota Corolla

1 Answer

AC/Defroster issue


On most vehicles the AC comes on when the defrost is on to keep AC compressor/clutch from seizing up from non use during winter months.

Aug 08, 2009 | 2007 Nissan Altima 3.5 Sedan

2 Answers

AC/Defroster issue....


Turn the heat level up for a few minutes. It will dry out the ducts.

Aug 08, 2009 | 2007 Nissan Altima 3.5 Sedan

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Heating / air conditioning control stuck to front defrost vents


There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Jun 19, 2009 | 1999 Dodge Durango

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