The weather turned cold and my windows would not defrost very well. What could the issue be?

 

How about giving us some info first? Like what year and make? What exactly is it doing and not doing? Have you done anything to it before your problem started?

 

I'm starting to like this old post I used to use even more as of late. Feel free to use it as needed.

Sounds harsh but just makes sense:
"Let’s play a game.

You pretend that you are the only one that knows what year/engine/model, etc that you are asking about.

We will all pretend you never asked a question until you provide at least the bare minimum of information about your vehicle".

 

No kidding!
It has been getting real bad lately.

 

I thought it was just me thinking that.

Hate to chase people off, but come on. Simple courtesy to provide info so you can get some answers.

Posts that read like a text to your girlfriend.

500 word run-on sentences.

Ad infinitum.......

 

I thought that it was that we are just getting grumpy with our old age. But I think that all of the younger people joining have no concept of communication and just want to be help without having to explain the problem...

 

My thoughts exactly!!!

Point and click with no info contributed, and want answers now.

 

Leaking heater core, weak blower fan, improper door operation, windows open, pile of wet towels in the back seat, wildlife run amouck under the seats expelling too much carbon dioxide.....

The list could go on. Specifics

 

first of all, do you have any air flow even cold albeit coming out of your defroster vents?
if there's plenty air movement, but cold, it's most likely your blend door.
if there's no air movement, but there's air coming out of other vents, then it's most likely a vacuum problem. however, default on vac leak will usually switch to defrost vent so your windshield would always have defrost.
if you have no air movement from any vent, then i'd look into your blower motor.
and last, depending on year, do you have power only on the high fan speed selector? if that's the case, then it would be your blower motor resistor...

but yeah, we gotta know a little bit more.

 

No necessarily. https://www.cherokeeforum.com/f2/99-...-vents-159386/

No I still havent fixed mine. I dont know how to other than replace the entire box as a whole which would suck. The door wont slam shut if I keep it at 1 or 2... 3+ it slams shut