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Defroster not working?

Tiny
KAREM CHEEZE
  • MEMBER
  • 2002 HONDA ACCORD
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 111 MILES
My heat comes out of the defrost, it’s makes me sweat fast. But my windows keep getting foggier and foggier the longer it’s on. Anyone know what I’m doing wrong here?
Sunday, May 19th, 2019 AT 10:39 PM

7 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Welcome to 2CarPros. That description sounds like there is either water or coolant being carried in the heat and that is what is fogging up the glass. Does the interior smell sweet? That would be a clue that it is coolant from a leaking heater core. If not it could be plain water. Either way the first thing to check would be the HVAC units drain. They can get plugged with dirt and crud and then the water that collects starts going places it shouldn't.
If you look under the hood down low on the passengers side you should see the drain tube, it will be the area where water drips when you have the AC on. The end is usually what is called a duck bill. If you squeeze the sides it will open the tube up. Don't do this while under it. If nothing comes out you can use a piece of wire or string trimmer line or similar to poke up into the drain to clear it out.
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Tuesday, August 25th, 2020 AT 1:52 PM
Tiny
WSH317
  • MEMBER
  • 1 POST
  • 1998 HONDA ACCORD
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 99,000 MILES
My HVAC will not blow air from the side vents (passenger/driver) or the little side window defroster vents, the center vents work fine. All settings seem to work fine. What could be wrong?
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Thursday, December 17th, 2020 AT 12:48 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is due to the mode door actuator not functioning correctly. Here is a guide that will help:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Also, I am attaching the process from the manual that will show how to replace it. Let's run through this material and let us know if there are questions. Thanks
Images (Click to make bigger)
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Thursday, December 17th, 2020 AT 12:48 PM (Merged)
Tiny
MRMIKEROSSI
  • MEMBER
  • 1 POST
  • 1995 HONDA ACCORD
95 Accord EX. Approx 135k miles. I have a few issues that may or not be related. My heater and defroster do not blow any warm air. The car was in Hawaii for 3 years so the heater wasn't used. The a/c will blow cold air most of the time. I've broken two temp knobs on the dash by turning them too far causing them to break from the inside. The other issue I am having is my dash lights flicker on and off. They stay off most of the time unless I hold the dimmer switch all the way to the left. My temp gauge and odometer/speedometer stopped working, but my tachometer and gas gauge still work. I wasn't sure if all of this could be related to something electrical in the dash. Thanks for any help you can provide.
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Thursday, December 17th, 2020 AT 12:48 PM (Merged)
Tiny
BRUCE HUNT
  • MECHANIC
  • 3,754 POSTS
The shorting is electrical and could be ground related in the dash. The heat and cooling problems I would suspect are related to the damper door sticking on the plenum. Sounds like it is mostly shut.
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Thursday, December 17th, 2020 AT 12:48 PM (Merged)
Tiny
BNEAL09
  • MEMBER
  • 1 POST
  • 1992 HONDA ACCORD
1992 Honda Accord Automatic

Im trying to figure out why my car defrost is not doing the job. The back window defrost a little, but the front window when I cut the defroster on it begins to fog the window up more. My heater also doesnt work that well. It blows air out but the air is not hot. I really need to know whats going on with it and hopefully its not all that expensive to fix the problem. But its so dangerous driving around and can barely see out my widows.
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Thursday, December 17th, 2020 AT 12:49 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi bneal09,

Check the air mix cable adjustment. If the air mix door is not functioning correctly, heated air would be affected.

Check the coolant level in radiator.


https://www.2carpros.com/forum/automotive_pictures/192750_HeaterAssy92AccordFig01_1.jpg



FUNCTION CONTROL CABLE
Slide function control lever to defrost position. Move heater control arm to defrost position in door link slot. Connect heater control cable to heater control arm, and gently eliminate any slack. DO NOT allow heater control arm to move. Snap cable housing into clamp.

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Thursday, December 17th, 2020 AT 12:49 PM (Merged)

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