Question about 1990 Volvo 240

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There is a mist that comes from the vent near windshield inside the car and fogs it up leaving a residue.If heat is on the inside of car will get filled with mist

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You have a leaking heater core. This is not the kind of job I recommend for the less experienced. Quite complicated.

Posted on Jun 26, 2014

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Posted on Jan 02, 2017

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SOURCE: defrost is not working. Volvo 1989 sw240

You have a problem with the vacuum operation of the dampers that control the direction of the airflow. You will need to pull the front panel of the console and look at the vacuum hoses that attach to the back of the control buttons. If those are attached, look under the dash to see if they are attached to the small bellows that control the dampers. You should pull the glove box out so you can see the damper under the dash to get a look at it and get an idea for how the other one looks. There is a second damper to the left of the one behind the glove box. Behind the bellows there is a small nipple that any loose hoses should be attached to. Take a flashlight along when you start exploring. If those are okay, check the other side.

Posted on Jan 28, 2009

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SOURCE: Well when I turn on the heat the windshield fogs

Seems like you've got some damp in there.

1) Check that the run off's are not blocked. These are the pipes that allow water to run off the front screen and the plastic below it. Under the bonnet / hood.
2) Could be damp in the cabin pollen filter. Clean out the housing, check the seals and replace the filter.
3) Check that the carpets are not damp - could be hole in the bodywork cause by rock or some such.
4) If it is an estate car / station wagon, in the back behind the seats, near where the seat belts go in, there is a "vent" at each side. Behind the plastic slotted cover is a block of foam rubber. Check these are dry.
5) Try clean the windscreen / windshield with a solvent based cleaner. Then use a product such as FogX

Posted on Oct 22, 2009

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1 Answer

Air vent schematic


air for the inside of the car comes from the vent at the base of the windscreen or is recirculated inside the car
if you see what appears to be mist, fog or smoke from the ac vents ,it is extra cold air from the ac system that is seen as fog when it hits the air in the car
you will know exhaust fumes by the smell

Nov 18, 2015 | AC Cars & Trucks

1 Answer

Steam coming from windshield defroster


You probably have a bad heater core. These are located in the ac heater boxes either inside the car or on the firewall box. Moisture from that box will create fog like mist on your windshield..
replace heater core, it's similar to a radiator.

Apr 01, 2014 | 1994 Acura Legend

1 Answer

Windscreen keeps misting when car is parked


Is it fogging up when you use the heat or a/c? Is it fogging up after sitting outside on a particularly dewey night?

An easy fix and one to try first is turning the temperature gauge over toward heat, and setting the directional controls to defrost. Up the power on the blower for a moment. The warmer air will usually clear up a foggy windshield in seconds on a chilly or even not-so-chilly morning. The condensation on the glass needs a change of temp in order to evaporate. Sometimes you can get the same effect by using outside air to circulate through your car's blower system. Most have a way of circulating either inside-car air, or outside-car air.

If the glass fogs when you're driving down the road and have the heat on, or the a/c - do you smell something sweet or see white smoke coming out of your air vents? If so, you could have a faulty heater core. I wouldn't imagine this is the problem on such a new vehicle, but it could still malfunction.

Of course, if you're trying to wipe this fog clean and it won't go away, maybe you've got someone smoking in the car and leaving a film on the glass. It would take a lot of smoking to make the windshield look foggy though.
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Feb 15, 2014 | Cars & Trucks

2 Answers

My 2001 jeep grand cherokee has a dark mist/smoke coming out of the vents, and defroster. But, the heater works fine. What could it be?


DO NOT USE STOP LEAK!!!!!! That stuff has no brain so you cant tell it to plug only specific leaks. It will go for the easiest hole to plug which can be a water port in the cooling jacket for the cyl heads. replace the heater core. Fix it right or bypass but please please please do not use anything that will stop a leak

Dec 22, 2012 | Cars & Trucks

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

2 Answers

Antifreeze steam comeing through vents


Your heater core has a leak, it's like a small radiator that heats up and the blower motor blows air thru it to create heat in the car. It is leaking anti freeze into the heater box.

May 12, 2010 | 1998 Mercury Sable

1 Answer

Heater steams up all glass on inside of car


pop the bonnet(hood) right under the windscreen rubbers you will see a blavck plastic box about 3feet wide,clean out the drain under the fan unit,it is blocked with s...

Apr 26, 2010 | 1992 Audi 100

2 Answers

Fishy, steam odor coming from AC vents


Forget the radiator tank. Your AC 'Condensate drain' hose is plugged up. This is a common problem. If you know where the hose comes out under the car you can ( carefully ) push a wire up it. If you're lucky it's plugged near the end by a mud-dauber wasp. If not, take it to your dealer and see if you can persuade the write-up guy to show you where the drain outlet is as a gesture of good faith. If they insist on charging you money, consider that when you buy your next car...

Dec 30, 2008 | 1994 Lincoln Town Car

1 Answer

No air or heat up to defroster and plenty of heat to vents


You can use a little shaving cream on the inside of your windshield. It will keep your windshield of fogging up. It also works in the mirrors in your bathroom near the shower / bath tub. If you don't believe me, do a search in google for shaving cream and windshield. Pretty cool, huh?

keywords: defrost shaving cream

Dec 27, 2008 | 2001 Dodge Dakota

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