Concord defrost fan

I have a 96 ChryslerConcorde that when started from cold the defrost fan
(which is set on high) fan won't start. If I turn the fan switch down
then up again everything works. This has the automatic climate control.
Any Idea's?

 

it's probably in climate control if you turn it off and then back on or
a switch..i had a 91park avenue
that done same thing...it was to much money 4 me to fix it right so i
just lived with it i had 275000 miles on it....good luck.

SCRAPPER.....

 

When you move that knob it changes from "Auto" fan to manual control.
Right? Is that what is happening, or is something else happening?

 

yes thats whats happening...if you set it for high on that tells it when
it's suppose to stop when you get it to the temp you want...then when
you setting it higher manualy it will go higher if you set for higher
temp by hand..like i say keep doing what your doing it'll last a long
time unless you want to replace the whole climate control....good
luck..

SCRAPPER...

 

Yes that is right. I have a remote start which makes this a pain,
otherwise I would just turn it down and up again at startup. I have put
a used controller but no luck.


Joe wrote:

 

Do you know of anyway to force it to manual mode from startup?

 

That's because it's doing what it's supposed to do. Right? Do you agree?
The problem is that it's designed to do that.

It would be easy enough to modify. The speed controller is under the glove
compartment. It just acts as a variable resistor. Two big wires in and out
carry the fan power. You could put a switch between those.

 

Thanks Joe

When its 20 below outside and I have the auto temp set to 70 above and
the fan set to high I would expect the fan to run on high until it got
to 70 above in the vehicle when it first starts up. Why would the design
be different then that?

 

Hi...

Not a mechanic, let me try from another angle if I may?

My 94 lhs does the same thing, and this is why.. if it's 20 below,
and the engine is *cold* it can't possibly do anything but blow
20 below air on the windshield, right?

This would accomplish nothing as far as defrosting goes, but the ice
cold moving air would feel terrible to us humans.

So it waits until it has a little heat, then turns the fan on slowly,
so that the heat is on the windshield, but not so fast as to feel
cool on our faces.

As the engine warms up, the fan speed will automagically increase until
it begins to approach the temperature you desire - in your example
above 70 degrees.

Take care.

Ken

 

Two reasons:
First, the engine is cold,and your car is smart enough to know that. No
heating is going to occur for about 5 minutes. They even made cars 30 years
ago that were capable of making that decision for you.
Second, with automatic a/c controls, a designer could make a decision to put
all or part of the system back in automatic under certain conditions. You
just never know what the reason is. About 100 times a year, somebody will
get into a usenet group and gripe about their a/c compressor running in the
winter time. The designers of the car made that decision, and right or
wrong, that's why cars do that.

 

I've had auto climate control in a 94 LHS, 99 300M, Toyota Avalon, Ford
Taurus, Honda Accord and Honda Odyssey. The Chrysler units were the best by
far. Honda doesn't have accurate temperatures and don't know when to run
fresh air vents or defroster vents, Toyota required constant attention, Ford
had minimal features (of course that was back in 1991). The only thing
negative about Chrysler is full speed fan that made a racket when it was
trying to cool a hot car that was just started. I think later models have
an option to prevent that.

 

after all this you still don't believe us?????
best of luck to you then....

SCRAPPER...

 

Oh I believe you . Is there any way to set the system to manual mode all
the time?

Thanks for all the answers and patience.

 

Hi...

None that I've been able to find.

But if you'll turn it off, then press auto just before shutting off the
engine for the last time of the night, then it will warm up and defrost
in the morning much more efficiently than we could do it manually.

If you think about it, "it" knows the outside temperature, it knows the
inside temperature, it knows the coolant temperature.

Heck, it even knows other little tricks that we don't think of...
You notice yet that in full manual it starts off by putting its first
air at the floor duct? That's because it has a little warm air to
share, but the heater core likely has a little condensation on it that
froze, and as it melts would throw "snow" out the defrost vents. Or
a bit warmer high humidity air, which would freeze on the inside of
the windshield making things even worse

Take care.

Ken

 

Thanks for all the help guys - much appriciated

 

Hey, I did a little experiment on mine- I put it in manual mode before I
shut it down, to see if it would obey me in the morning.. It works, at least
when using the key in the normal way. When I started it back up, it came
right back in manual mode, Defrost, high fan speed.

The key is to get it in manual mode the night before.

 

I keep my fan in manual mode, it automatically corrects the temperature.
In full Auto mode the fan often went on full high, a terrible noise.