Defroster Mod?
Thread Starter
Rennlist Member
Joined: Nov 2009
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From: PNW
Defroster Mod?
I live in Portland and need the defroster quite a bit up in the damp months. But it's either off or full blast. Is there anything that could be done to make it so it blasts on to do it's job and then turns down to a maintenance mode to keep it from fogging back up? Now I blast it for a minute then ten minutes later blast it again for a minute.
Pro
Joined: Mar 2010
Posts: 542
Likes: 124
From: Spokane, WA.
Hi there, I was never really familiar with the HVAC controls on my car even after having it for a few years. I learned to live with it better after reading this thread: Heater Controls on 964
On damp or cold drives around here (like today) I make sure the top slider is full on to the left so it directs all that warm air to the windshield. Fan speed then is easier to control.
The defrost blast is just for those moments where it's just too much.
Not a mod, but maybe a different way of using it. Hope it helps.
On damp or cold drives around here (like today) I make sure the top slider is full on to the left so it directs all that warm air to the windshield. Fan speed then is easier to control.
The defrost blast is just for those moments where it's just too much.
Not a mod, but maybe a different way of using it. Hope it helps.
Rennlist Member
Joined: Dec 2007
Posts: 978
Likes: 183
From: Chicago, IL
Originally Posted by Hella-Buggin'
I live in Portland and need the defroster quite a bit up in the damp months. But it's either off or full blast. Is there anything that could be done to make it so it blasts on to do it's job and then turns down to a maintenance mode to keep it from fogging back up? Now I blast it for a minute then ten minutes later blast it again for a minute.
On the other hand you get almost instant warm air and you can also run your AC to dry the cabin air.
Rennlist Member
Joined: Apr 2004
Posts: 2,567
Likes: 536
From: Oslo, Norway
Fogging of the windscreen is a completely normal phenomena in air cooled cars.
The engine lid opening allows for a lot of water to go into the engine bay when parked outdoors in rain. When the wet engine heats up after cold rainy night, huge amounts of hot humid air will be produced in the engine bay.
If you have the cabin temp set to anything above minimum, this extremely humid air will be sucked into the cabin from the engine bay through the heat exchangers. When this air hits the cold windows they immediately fog up due to the condensation on the cold surface.
The trick is to set the Climate Control temperature **** to minimum before turning on the ignition and keep it there for about 2-5 minutes after you have started driving in order to vent out all the humid air from the engine bay before turning up the heat. All air will then be drawn from the front fresh air intake, and have the same temperature as the windshield. No fogging.
Cheers,
Tore
The engine lid opening allows for a lot of water to go into the engine bay when parked outdoors in rain. When the wet engine heats up after cold rainy night, huge amounts of hot humid air will be produced in the engine bay.
If you have the cabin temp set to anything above minimum, this extremely humid air will be sucked into the cabin from the engine bay through the heat exchangers. When this air hits the cold windows they immediately fog up due to the condensation on the cold surface.
The trick is to set the Climate Control temperature **** to minimum before turning on the ignition and keep it there for about 2-5 minutes after you have started driving in order to vent out all the humid air from the engine bay before turning up the heat. All air will then be drawn from the front fresh air intake, and have the same temperature as the windshield. No fogging.
Cheers,
Tore
