Question about 1998 Dodge Ram 1500 4WD

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Windows fog up in 1999 dodge in cold weather when i turn on defrost

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Anonymous

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Posted on Jan 02, 2017

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s60six

  • 328 Answers

SOURCE: Heater works but defrost fills inside with fog.

your heater core has probably sprung a leak.does the fog smell kinda sweet?....check the floor in the front where the floor mats are for moisture or even puddles of antifreeze.(the replacement of a heater core can be very expensive as the entire dash usually needs to be removed to access the heater core)also look under the engine near the firewall for antifreeze drips.

Posted on Dec 13, 2008

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s60six

  • 328 Answers

SOURCE: Frost on inside of window

your heater core is probably leaking.....this is a big job to fix you'll probably want to take it to a shop to have this done as the complete removal of the dash is necessary
Good luck.........thanks for choosing FIX YA!

Posted on Jan 15, 2009

motor1258

Mike Butler

  • 6674 Answers

SOURCE: Defrost and Heater causes windows to fog

If it smells like antifreeze, and leaves a film on windshield, it's probably a leaking heater core, but if not, your drain tube/passage for heater/AC duct-work, is plugged and not allowing moisture to drain out. Not 100% sure where drains are on that but, I would look real close at lower firewall in engine compartment,opposite duct-work, as well as under truck near front floor, for tubes sticking out, and carefully and gently, run a pipe cleaner or similar in & out to clean, until moisture starts to run out.

Posted on Nov 14, 2009

motor1258

Mike Butler

  • 6674 Answers

SOURCE: have 1999 dodge durango, replaced the water

Is your coolant level going down, on a regular basis, to the point that you need to add some periodically? If not, then lets say it's not heater core for now, and that dripping that you see on passenger side may be the drain tube from the heater box. Try to pinpoint exactly where that drip is coming from, and if it does look like a drain tube, try poking a pipe cleaner or something similar in there carefully to dislodge whatever may be clogging up that tube. My guess is that it's plugged up and that's what's also causing fog inside vehicle. Once that's drained out, things will dry up and you should be back to normal with a little luck. If your not sure about whether or not core is leaking, have a rad, or repair shop, perform a system pressure test, and that should tell you whether or not you have a system leak, then you can investigate further if necessary.

Posted on Dec 06, 2009

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: Starting a 2002 Dodge Neon in extremely cold weather

Turn the ignition key to the run position for 30 seconds and then off for 5 seconds and turn it on to the run position again for 10 seconds and then start the engine. This will pressurize the fuel system and warm up the MAF sensor to burn off any dirt and frost on the filament, you should not have to press on the gas peddle, the Idle air control valve should do that for you. Good luck and this should help.

Posted on Jan 05, 2010

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1 Answer

Dodge durango 2001 fogging up windows not defrosting


It's most likely your heater core that is causing the problem it could be leaking either from the core it's self causing anti freeze to get into your vents or from one of the hoses leading to it.....I am assuming that when your heat is on there is a dampness in the air this is what is causing the windows to fog up.

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Are you using the fresh air option ?
If you are, you could have excessive moisture inside the cabin. Running the hvac on defrost should kick on the ac compressor and bring in fresh air too.

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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.

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The windows on my 2005 Chrysler Pacifica fog up or ice up


IN COLD WEATHER USE BI LEVEL AND TURN ON HEAT ON AC AND HEATER MODE SWITCH AND HEAT MODE THAT WILL KEEP WINDOWS FROM FOGGING UP KEEP CAR WARM ON THE INSIDE WHEN COLD OUT SIDE ALWAY CARRY PAPER TOWER OR SOME THING TO WIPE WINDOWS WHEN FOG UP MOST TIME I HAVE PROBLEM WINDOWS FOGGING UP WHEN YOU HAVE COLD RAIN OUT SIDE.IF WINDOWS FOG REALLY BAD I HAVE TO TURN MODE SWITCH TO COLD MODE AND TURN ON DEFOGGER.

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My wife has a 1999 dodge ram 1500 truck, Im trying to see if I can get some help in a problem with the heater/defroster unit. When you turn on the heater or set it to defrost it blows out hot are like it...


The heater core is bad. It a big job. Part is only about $60 but a lot of labor you have to take the whole dash apart and out to change it.

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Windows fog up on the inside when defroster is turned on


leaking heater core. The coolant level may be low also. What it is doing is fogging up the window with the steam coming from the hot engine coolant that runs through your dash board when the heater or defrost is on. This should be under some kind of warranty on an '08.

Dec 05, 2009 | 2008 Hyundai Sonata

1 Answer

Defrost and Heater causes windows to fog


If it smells like antifreeze, and leaves a film on windshield, it's probably a leaking heater core, but if not, your drain tube/passage for heater/AC duct-work, is plugged and not allowing moisture to drain out. Not 100% sure where drains are on that but, I would look real close at lower firewall in engine compartment,opposite duct-work, as well as under truck near front floor, for tubes sticking out, and carefully and gently, run a pipe cleaner or similar in & out to clean, until moisture starts to run out.

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2003 dodge conversion van windows frost on inside.


Feel any drafts under dash area on either side, usually drivers but check both, or perhaps around engine cover, while driving?

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The inside of the car fogs up and on very cold mornings ice forms


This can be caused by a heater core that is leaking inside the car, one way to determine if that's the problem, is if you can smell antifreeze. It is a 'sweet' smell, and is quite noticeable. If u don't notice this, I have to say this is a common problem w/ Hondas. I've had a civic, 2 accords (currently have a 92), and 2 Preludes, they are great cars, but they all suffer from fogged up windows in cold weather. One reason is that they are quite air tight, and the older models don't have the greatest defroster system (weak). Try and keep a window cracked open slightly, see if that helps.

Jan 04, 2009 | 1992 Honda Accord

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