Windshield Demister Weirdness - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
 
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post #1 of 8 (permalink) Old 12-31-2017, 05:52 PM Thread Starter
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Windshield Demister Weirdness

Hi

I hope everyone's had a great Christmas and all the best to everyone for the New Year!

Since I bought my Concorde a couple of years ago I've always had this weird thing where the demister doesn't come on immediately, specially in winter! It's several miles before it finally springs to life by which time I can hardly see where I'm going. It does seem worse in winter, but maybe that's just because misting up isn't usually a summer problem.

A pal of mine had an LHS and he said his was the same - thought "no air until engine warms up". As a "feature" this seems more than a bit crazy and I wonder if there is any cure for this?

Thanks and best wishes to all!

Pavesa
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post #2 of 8 (permalink) Old 12-31-2017, 05:58 PM
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Wiper fluid with "antifreeze" in it? Usually sold as such.

Weak washer pump motor?
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post #3 of 8 (permalink) Old 01-01-2018, 09:30 AM Thread Starter
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Hi Ronbo

sorry, I think I'm using wrong words.. (I'm from the UK and a defogger is called a demister) it's the defogger that doesn't come on right away.

I find that it usually comes on eventually if I switch it off and on several times after a few miles..

Thanks for any thoughts
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post #4 of 8 (permalink) Old 01-01-2018, 11:26 AM
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We also call it the defroster.

The BCM doesn’t turn the cabin fan on on cold start in freezing weather if the ATC is in “Auto” mode until coolant temperature is above some threshold. Makes sense since it won’t accomplish anything except create a cold draft for you and your passengers.

You can force the ATC out of Auto mode by moving the fan speed button, at which point the fan will spring to life to whatever speed you select. (I’m thinking also pushing any button that forces the system out of Auto mode will accomplish the same thing.) But again, until engine temp. comes up, it won’t accomplish anything good.

Another fact not directly related to your question is that the defrost mode can be useless in removing condensation/fog/mist from the windshield in humid situations if the a.c. is not working. The a.c. is run even in cold temperatures to condense out the moisture in the air before it is sent thru the heater core and out the vents. Without the a.c. to pre-dry the air, the moisture will condense out on the windshield and windows making it impossible to see. If you’ve ever had your a.c. out of order in a humid area, you know what I’m talking about.


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post #5 of 8 (permalink) Old 01-01-2018, 05:46 PM Thread Starter
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Hi Peva

thanks for the info.

I don't usually have the ATC in Auto, so maybe a solution for me is to put it in Auto and then adjust the fan speed button. I tend to think that having a bit of airflow up the inside of the windshield keeps humid breath away from it. Actually my a.c. isn't working - I was thinking a project for next May - maybe that's my problem?

Andrew
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post #6 of 8 (permalink) Old 01-01-2018, 05:52 PM
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As soon as you move the fan speed knob it will put the ATC into "Manual Mode" just like pressing any of the Mode buttons.

If your A/C compressor isn't working then it's most likely the root cause of your issue. Just like Peva outlined above.
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post #7 of 8 (permalink) Old 01-01-2018, 07:32 PM
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Quote:
Originally Posted by Pavesa View Post
...I tend to think that having a bit of airflow up the inside of the windshield keeps humid breath away from it...
Actually I agree with you. On my morning start up when temperature is right around freezing, I find that forcing the fan on helps keep the windshield clear of fog and even very light ice very soon after start up. Mine is very seldom in Auto mode because I can control the fan speed much better than the computer - the fan seems to always be either too high or too low (usually too low) for what’s really needed in most situations.
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post #8 of 8 (permalink) Old 01-02-2018, 11:23 PM Thread Starter
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Hi Ronbo and Peva

thanks for the thoughts on this.

Actually I did find that today putting it in Auto and then adjusting the airflow meant it came on much more quickly - inside a minute which was great! It wasn't instant though.

Another reason to get the a.c. fixed!

Thanks again for the thoughts and have a happy New Year!
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