1998 Chevrolet K2500 Logo

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Anonymous Posted on Jan 05, 2014

Poor air flow defrost 1998

Windows fog over at idle and defrost won't keep up y

4 Related Answers

Anonymous

  • 2920 Answers
  • Posted on Jan 12, 2009

SOURCE: No cabin heat.. windows fogged.. engine runs cold!!

chances are the heater core is clogged and wont allow proper circulation for the heater.i would suggest getting a new one put in and see if that dosent fix it for you.

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Anonymous

  • 96 Answers
  • Posted on Feb 03, 2009

SOURCE: 2000 S10 Heater/Air

you have a bad heater core

Anonymous

  • 36 Answers
  • Posted on Dec 31, 2010

SOURCE: 1999 siverado 1500. heater fan

It sure could be a blend gate. I have had some problems with the blower motor fans rubbing on the inside of the hvac housing too. When this happens the air will not flow to the hvac housing and then out to the vents. It is an easy check. Just pull out your blower motor and check the housing for any rubbing marks on the housing or the fan. Past that then you need to further check the blend doors or possible blockage of the heater core or A/C evaporator. Hope this helps.

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Feb 24, 2012

SOURCE: Poor Air Flow through the air condtioner

The procedure to check this filter and replace it is the same for the Express as the pickup truck. Please go to this LINK for instructions.

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1helpful
1answer

How do I stop the inside of windows from fogging up

You need to switch your air flow from recirculate...to out side input...the recirculate always fogs up when cold or wet outside...Hope this helps. Use the defrost mode...but be sure recirculate is off...
tip

Tips for operating Air conditioning system on Toyota Hilux and someother...

To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.
0helpful
1answer

1998 Nissan sentra ac bypass

Assuming that it is working in frigid conditions, sometimes The
Ac works with the defroster to remove moisture and the fog on the inside windshield. So, turn the defroster of unless you need it when the windshield fogs. You may be able to keep the window clear by opening the outside air vent and increasing the heater temperature.
1helpful
1answer

I have an issue with my windows fogging up when I use heat to defrost them.

This is normal if your A/C doesn't work. When set on defrost the A/C kicks on and off to keep the fog from appearing. the fog goes away once the heat inside reaches a certain temperature. Unless the drain is clogged and the plenum is holding water. Do you have ice on the inside? clean the drain. It's on the passenger side, near the bottom of the firewall. A rubber tube coming out, that goes to nothing.
0helpful
1answer

Hi just got an audi a4 2001, 1.9tdi 130bhp, the windows keep fogging up and there doesnt seem to be air coming out of the vent for the front windscreen??? can anyone help??? the back windown is fogging up...

Windows fog up because of the humidity in the car. Run the ac and this removes the humidity from the air and the windows will not fog. If you do not have air flowing from the vents then check that the selection control is moving the vent doors . Check that the vacuum line is connected and not broken.
3helpful
1answer

When I turn my heater and defroster on, a bad smell starts and the windows fog up but the air is hot.

This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.
0helpful
1answer

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.
1helpful
1answer

Heater & defroster works fine but inside car windows keep fogging

So you have the vent settings to blow out of the windshield vents and still have fogging?

You can dry out the air more quickly if you use the air conditioner setting. It sounds backwards, but this is exactly what the manual in my older car said to do. (Some cars are electronic control and won't let you do this however - or they do it automatically with the defrost vent settings).

For the older car, I would set the heat to the hottest setting and press in the a/c button. The a/c dries out the air, but it does not have to be set to run cold.

Another thing that could help is to make sure that you do not have the vents set for "recycling" the air. The picture should look like a u shapped arrow. Make sure it is not pressed in.
0helpful
1answer

THE DEFROST BLOWS OUT HOT AIR, BUT THE FRONT SIDE WINDOWS AND THE TOP OF THE WINDSHIELD FOGS OVER. HARDLY ANY AIR COMMING OUT OF THE VENTS ON THE SIDE OF THE DASH THAT BLOWS ON THE FRONT DRIVERS SIDE AND...

You didn't specify what type of vehicle.
If you have very poor air flow out the vents, later model vehicles have a hepa filter or cabin filter in line form the blower motor to the vents. It can be plugged quite easily and drastically cuts down the air blown into the vehicle. Check to see if they are plugged. Secondly, Check your coolant level in the rad and reservoir. If the windows fog up when cold and air flow is good it could indicate a leaking heater core. Check the passenger side floor for signs of coolant again I don't know the type of vehicle, some heater cores are located at the firewall under the hood.
2helpful
2answers

How do you change heater core? 98 5.4 expedition . Fogging windows on defrost.

its about a 2 day job and involves removing the entire dash.. if your not sure i would ask a quote from the mechanic
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