unwanted heat

[rgmrgm]

I am getting heat from the small vent on the driver's side of the dash that i can't shut off. what would be the best way to eliminate that and all heat into the cabin for the summer.

[shadowjack1]

Would seem that the heater box on the drivers side is not closing all the way.

[Bob Kontak]

Originally Posted by rgmrgm

I am getting heat from the small vent on the driver's side of the dash that i can't shut off. what would be the best way to eliminate that and all heat into the cabin for the summer.

I have never adjusted the heater boxes on my 81 but them boxes are the gate keepers.

Jack it up and use jack stands for safety. Here is an article on replacing heater boxes which describes connecting the cables - which is the first area I would look at in your case - at least adjusting the cables. Have a friend help (lever puller - and wear goggles as debris will come at you when the cable is pulled.

http://www.pelicanparts.com/techarticles/tom_sharpes/heater_box2.htm

Another idea is to disconnect the tubes that hook up to the exhaust pipe heat exchangers if you want total assurance. I have done this. The ends of the hoses or the orifices they connect to in the engine compartment should be capped off. This will improve (or not detract from) the big cooling fan airflow over and through the head fins as well as through the engine oil cooler.

Downside to the above paragraph is when you get up at 5am and need a defroster you are SOL. Also, I do not know if not blowing air over the exhaust components (hoses disconnected) is a bad thing. I doubt it but don't know.

[DRACO A5OG]

+1 Flap is not closing all the way. over time the cable stretches or road debris/rust has lodged in there and not allowing the flaps to close. raise and adjust.

Also is the heater levers all the way down?

[megerian]

Forgive me, where exactly are the heater boxes, on an '88 ?

I have similar symptoms. With the heater dial between the seats turned off, and the two red levers pushed all the way down, I still get a bit of unwanted heat coming in.

[Dublinoh]

Originally Posted by megerian

Forgive me, where exactly are the heater boxes, on an '88 ?

I have similar symptoms. With the heater dial between the seats turned off, and the two red levers pushed all the way down, I still get a bit of unwanted heat coming in.

Follow the hose that attaches to the front of the heat exchanger, one end on heat exchanger, the other on the control box.

[Flat Six]

rgmrgm:

Some sage advice above. This thread may be helpful to you as you attempt to adjust your cables:

http://forums.pelicanparts.com/porsche-911-technical-forum/397037-heater-flapper-box.html

In addition, you may find your heater boxes may have seals that have failed. If that's the case, I found this thread useful:

http://forums.pelicanparts.com/porsche-911-technical-forum/589980-cleaning-flapper-boxes.html

Hope this helps.

Dale

[megerian]

Good advice here. It only took me 3 months to get around to this quick project. I noticed how hot it was getting in the driver's side compartment, so I was pretty sure what I was going to find.

Sure enough, the passenger side was fine, but on the driver's side, the box was stuck in a halfway open position, so even with the red handle all the way down, there was significant heat coming into the car. Not so fun during our Minnesota 100 degree heat wave.

So a shot of WD-40, and some forceful wiggling, and it dislodged and now its perfect. I didn't even have to disconnect the wire.

Thanks again to this forum, for saving me a trip to the mechanic. All it cost me was a new pair of jack stands, but I needed those anyway.

[javadog]

never mind...

[RyanH]

Originally Posted by Bob Kontak

I have never adjusted the heater boxes on my 81 but them boxes are the gate keepers.

Jack it up and use jack stands for safety. Here is an article on replacing heater boxes which describes connecting the cables - which is the first area I would look at in your case - at least adjusting the cables. Have a friend help (lever puller - and wear goggles as debris will come at you when the cable is pulled.

Pelican Technical Article: Heater Box Replacement

Another idea is to disconnect the tubes that hook up to the exhaust pipe heat exchangers if you want total assurance. I have done this. The ends of the hoses or the orifices they connect to in the engine compartment should be capped off. This will improve (or not detract from) the big cooling fan airflow over and through the head fins as well as through the engine oil cooler.

Downside to the above paragraph is when you get up at 5am and need a defroster you are SOL. Also, I do not know if not blowing air over the exhaust components (hoses disconnected) is a bad thing. I doubt it but don't know.

Can the end of the heat exchanger at the flapper box end be capped off if this hose is removed? Where would the heat go? I don't need heat and the cab just gets too hot with the old flapper boxes.

Cheers...

[Nick Triesch]

Sometimes our flappers just get old and worn out. Sigh.

[patz]

There are replacement flapper boxes available. Or remove them clean and lube. After all they are exposed the road debris and the elements. Maintenance is a good thing.

[RyanH]

Originally Posted by RyanH

Can the end of the heat exchanger at the flapper box end be capped off if this hose is removed? Where would the heat go? I don't need heat and the cab just gets too hot with the old flapper boxes.

Cheers...

I'm in Queensland Australia, don't need the heat and as Bob says a simple solution for now is to disconnect the hose between the heat exchangers and flapper boxes. Just wanted to know if the heat exchanger gets capped off? Cheers...

[darrin]

Ryan -- how will you handle defrosting your windshield if you completely remove the heat capacity? Have you tried simply lubricating and moving around the flapper boxes to get the heat to properly turn off?

[RyanH]

Originally Posted by darrin

Ryan -- how will you handle defrosting your windshield if you completely remove the heat capacity? Have you tried simply lubricating and moving around the flapper boxes to get the heat to properly turn off?

Thanks Darrin however, as stated Queensland, Australia, 30 degrees in the winter and warming up in the summer no frost, ever!

[Targalid]

Definitely don't want to leave them open in Aussieland. Too many things could crawl in there and emerge when least expected. Cap them if you don't clean and adjust the air inlets.
All they need is a little cleaning, lubricate the moving disk and maybe some spray paint. You might have fifteen minutes in this project if you are slow. The longest part is jacking the car.

[RyanH]

[QUOTE=Targalid;9071823]Definitely don't want to leave them open in Aussieland. Too many things could crawl in there and emerge when least expected. Cap them if you don't clean and adjust the air inlets.
All they need is a little cleaning, lubricate the moving disk and maybe some spray paint. You might have fifteen minutes in this project if you are slow. The longest part is jacking the car.[/QUOTE

My worry for capping off the heat exchanger was if it would build up any sort of heat pressure? I don't know if that's even possible? Usually the heat would escape through the flapper box to the ground if closed so where would it go if the heat exchanger is capped? Just been for a short drive and the heat from the engine bay is a bit fierce?Cheers...