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Discussion Starter #1
Anyone else find that the rear defogger on the MDX doesn't do a very good job. Recently in the Atlanta area, we have been having rainy conditions. I use the rear wiper, but I also switched on the rear defogger button. Just to see if the rear defog was working well, I didn't use my rear wiper on a trip, only the rear defog. Well, there was about a 1/8 inch clearing around each horizontal heating element on the rear window, but the window never cleared.

Is this something I need to get checked, or is everyone's like this? I never had any problems with the rear defrost on my Legend.

cbarry
P.S. I made sure the defog was on and hadn't auto-turned off (15 min per manual)
 

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We've had similar conditions up here in Philly (rain, fog, etc.) and my rear-defroster has worked well. I was not using the rear wiper and it was clearing the window completely between the elements.

You wouldn't think this is something that could vary between vehicles...

Rick
 

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I've used the rear wiper & rear defogger. Together & separate.....not a problem.

Does a great job!:)

You might want to have you dealership check it, just in case.

It never hurts.

:D
 

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cbarry,

I did a search on "rear defogger" and found your post from last January. I'm having the same problem just as you described. I tried the rear defoggers for the first time this week. Did you ever get yours fixed? I'm due to bring the MDX in for my 7500 mi Oil change and, in addition to the Thud and Weeping Mirror TSB fixes, I'm going to have them look at the rear defoggers.

Was just curious if you had any luck.

DonsMDX
 

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cbarry said:
Anyone else find that the rear defogger on the MDX doesn't do a very good job. Recently in the Atlanta area, we have been having rainy conditions... /B]


With the heavy storms we had in the last three days, I found the defogger works just fine. No problem at all...
 

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Hmmmm.. mine never had been in rain, but indoors, the light lights on .... so should be fine :)
 

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Discussion Starter #9
I have never been able to get it fixed. When I brought my MDX in for my 7500 mile service, I informed them about the problem. It was a sunny day at the time, and they tested the circuit and said it looked OK. I am going to ask again at my next service, because the rear defog seems to perform very poorly. (In fact, much worse than my previous car, a '90 Acura Legend)

cbarry
 

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When you take your X in for service, have them measure and report back to you what the current draw is through the rear defogger circuit. Ask how the current level compares to nominal.

They also should be able to measure the temperature delta over time and compare that to the current draw.

One thing that really improves defogging performance is keeping the inside glass surface super clean. This is a delicate operation since you don't want to destroy heating elements in the process. New car glass tends to get a smoky film on the inside and this really hurts the ability to defog. This film is really hard to detect on "privacy" glass.

As I'm sure you know, running the AC keeps the humidity levels down as well.
 

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Have service carefully check the electrical elements for any cuts or breakage. It is possible that during a cleaning process, service may have accidently severed one of the heating elements.
 
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