Question about 2000 Jeep Grand Cherokee

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Windshield and driver & passenger windows fog constantly. this is a new problem

This is january but the heat setting on the defrost no longer clears the windshield

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  • Jeep Master
  • 20,706 Answers

Its normal if in recirc. mode. or not normal if stuck there.
the heater core is leaking engine coolant (funny smells)
for defrost mode is bad. , due to inop. dampers.
if heat is good to other ports. , then its damper failure.
the FSM covers the tests.
see that here
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

Posted on Feb 12, 2014

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Posted on Jan 02, 2017

Neoklassic1
  • 70 Answers

SOURCE: when i run the heat or air cond. i smell water and windshield fogs up in the middle.

Sounds like your heater core is bad. Have someone check out the heating system and possibly replace heater core.. that should take care of the fog problem also by enabling you to use the defrost... Good Luck!

Posted on Oct 26, 2008

  • 1118 Answers

SOURCE: 99 Grand Cherokee fogs windows on warm defrost, but not on cold

Yes you do need a heater core, if not replaced it will only get worse.

Posted on Oct 06, 2009

  • 1 Answer

SOURCE: Cold air passenger side, warm air driver's side

same thing happened to mine at 2 yrs. old , the connecting arm on air mix positioner broke. The whole dash had to come out. Part was cheap but labor was huge. This is not a job for the do-it-yourself.

Posted on Jan 13, 2010

Testimonial: "We have had to attend to this problem, and asyou have said the part cost was small and the labour huge. At least 8 hours to complete."

  • 27 Answers

SOURCE: Defroster will not defrost

it may be, but could be that the a/c compressor is not coming on to remove the moisture from the air. Visit honestautoestimates.com for free estimates on repairs and information regarding any repair.

Posted on Mar 01, 2010

  • 145 Answers

SOURCE: windshield fogs up and defroster wont clear it.

You probably have a leak in the heater core which is creating steam in the defrost system. So the heater core most likely needs to be replaced.

Posted on Jan 10, 2011

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3 Answers

What are symptoms of hearing core going bad?


LEAKING on passenger floor plugged up as in no heat.

Mar 09, 2015 | 1995 Toyota Camry

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.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

1 Answer

Fog goes away when i turn on heat. windows fog up from top to bottom. that means it is not a heater core


May I assume you've tried the 'defrost' setting? Front or rear windshield? I'd be looking at control to turn on 'defrost'. As for the in/out, there's an inlet and outlet hose to the core.

Jan 08, 2015 | 2006 Kia Spectra

2 Answers

Windows fog up


There is too much moisture inside the cabin. Either something is leaking water into the car, or your fresh air setting is not working on the hvac system. You can not run the system on recirculate and get rid of the moisture.

Feb 05, 2014 | 2003 Pontiac Sunfire

1 Answer

1998 dodge durango window fog


may be a blocked vent in the windscreen vents. could be at the windscreen end or at the controler in the heater. if you dont have a pollen filter fitted rubbish from the road i.e leaf's can get in and block it up.

Dec 08, 2013 | Dodge Cars & Trucks

1 Answer

Window fogging up


temporary solution is to goto walmart automotive section and look for rainX anti fog wipes. and if you change you control knob to a different zone do you get heat and does it go from vent to floor

Oct 02, 2013 | Ford Expedition Cars & Trucks

1 Answer

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.

Dec 20, 2011 | 1999 Oldsmobile Alero

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

Window fogs up after driving for awile. Just


The mildew smell you refer to could be anti-freeze. When a heater core starts leaking it may allow anti-freeze (which circulates through it for heat) to be blown through the ducts onto the windshield in defrost mode. The repair is to have the heater core replaced. It may wait for the thermostat to open and allow the coolant to circulate before you notice it. Occasionally the carpet on the passenger side may be wet from leakage.

Dec 12, 2009 | 2001 Chrysler 300M

1 Answer

When i run the heat or air cond. i smell water and windshield fogs up in the middle.


Sounds like your heater core is bad. Have someone check out the heating system and possibly replace heater core.. that should take care of the fog problem also by enabling you to use the defrost... Good Luck!

Oct 26, 2008 | 1999 Jeep Grand Cherokee

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