Maybe (not really lol) good for some vehicles pre 1990 but not the current HVAC system. The reason the AC is actuated and goes to full blower speed is to pull as much air through the system to DRY it as well heat it.
The reason you DONT re-circulate the air is because the cabin has moisture which is also why defrost automatically switches to outside air.
Learn about things before assuming how they work.

 

Unfortunately, my wetsuit didn't shrink - I expanded. But I kept the wetsuits as sometimes we liked them when just snorkeling in some of those rivers. My wife's wetsuit still fits her though.

 

Well oh great guru, I have done these tactics and they work. The idea is to get as much HEAT to the windshield as possible. Once
the frost/ice is melted, you can worry about the moisture in the cabin. Being aware of the weather forecast and planning ahead is the key.
The AC will still DRY the air passing through at the slightly lower speed will it not?
​​​​​​​I have learned a few things in the 60+ years I've been working on cars. Don't assume you are always right.

 

ya hence the wink in my response. hahahahahaha!

 

Thank you for the complement.
As I said your not accurate and the information to recommend other to follow is not very good. You can claim all you want that it works for you but in the real world that method is not the best way to do things.
As for me assuming I am always right... well please ... I did say how a HVAC system works I nowhere said "it works for me" or give less then verifiable and factual information.
60 years you have been working on cars as you keep bringing up in threads has not always and more often not the best or even the correct way to do things? You are never to old to go back to school!


I recommend that members read about exactly how a HVAC system work on your specific vehicle. If it be new Mazda this below is the basic information (Non-TECHNICAL) how it works.


In a very shorten version....Your car’s primary Mazda defroster uses the HVAC system to defrost your front and side glass. When properly set or when it is automatically activated will pull none circulated air (direct fresh air) into your passenger area which runs that fresh air through the now activate AC which will pull the moisture from the air as it passes over the cooling coils. and the heater core will now have dry hot air to blow over the glass.

 

Well here's a solution. Next time you are up in Canada during the winter, try it once or twice. My CX sits outside unfortunately so clearing
frost and ice off the windshield is job one.

My 2¢

 

ROLMAO defending your DIY to the end....


And you often assume that where I live "predominatly" I am not exposed to other operating environmental ambient temperature extremes or help people all over the world with Q&A about their vehicles almost dailey....

 

I seriously doubt you spend much, if any, time in Alaska or Canada in the dead of winter. An assumption I'm guilty of.
Head north, Alaska isn't far for a California boy. And it's winter to boot, you can experiment all day.

​​​​​​​My 2¢

 

again assuming things .

I did Ice Drag Racing with my Track built originally to race NHRA S/G before building a Camaro instead 482BB 1967 Nova on and off a couple years in Alaska .
Oh and trailed it there in my 1979 Monte Carlo.

As I recall we placed the Hotels towels on the front and rear window to keep them clear of frost and/or snow from overnight parking ROLMAO

 

Natural state of being ^^^^^^^^^^
Do you even read and look at pictures in my response of just go off on your rant?