Help: Illustration of Heat / Air circulation

[JabsZA]

Hi All,

I have a '77 911s. The previous owner took the AC system out, but i do not know whether he just disconnected the primary components and just left all the hoses etc...or whether he did the proper job and removed everything properly. I have lost of hoses, components that are connected, patched etc, but i am at loss of functionality.

Can someone educate me or provide a diagram, or video clip or something that explains in laymans terms how 911 air (hot and cold) circulation occurs?? I am looking to understand how the air flows from engine bay to the front of the car, through the air systems etc...

Can anyone also show me what the backdated heat / air circulation looks like in comparison???

Apologies if this is a well answered, documented answer...I appreciate your time.

Thank you!

[geoz]

You may want to check a few things.
Evap in the smuggler's box, dryer in the left front footwell, condensers in the rear decklid and behind the front bumper.

From memory the hoses run from the compressor in the engine bay forward on the left side of the car, behind the skirt to the dryer, then the evap, then the front condensor. From there back from the smuggler's box underneath the car to the right hand side (should be easy to see the hose there) and back to the engine bay.

I'm sure others will chime in and correct any errors.

[frankc]

Some time ago I started a thread on retrofitting a 911 with A/C to one without it. In that thread there is a diagram that may help illustrate the hot/fresh air flow for you.

http://forums.pelicanparts.com/porsche-911-technical-forum/385784-retrofitting-non-c-ventilation-ducts.html

[JabsZA]

Originally Posted by frankc

Some time ago I started a thread on retrofitting a 911 with A/C to one without it. In that thread there is a diagram that may help illustrate the hot/fresh air flow for you.

http://forums.pelicanparts.com/porsche-911-technical-forum/385784-retrofitting-non-c-ventilation-ducts.html

Thank you!!!!

[OsoMoore]

Obligatory repost.

This is a commonly asked question, so I thought I would re-post something I wrote up for the old Porsche Email lists before the dawn of the Pelican.

Q: I just bought a 911 and can't figure out how to make the heater work -- or the fresh air either. Can you help me?

A: Sure, I can help you. The ventilation system requires that you operate 4 levers to make it work. 3 of the levers are on the dash, and the other is between the seats -- on newer Pooscheys there are 2 levers between the seats).The top lever on the dash actually does several different things (remember, it is a fiendish German device, just like the rest of the car). Pushing it to the middle opens the dust ports leading to the windshield (see below for operation of fogging machine and oil mist spray device). Pushing it to the right past the middle also activates the rattling noise-maker device. There are three loudness levels to choose from. Pushing the lever all the way to the left is used to jam the cable so unauthorized personnel cannot operate any of the devices above. The lever also enables the automatic heat exchanger signaling device -- when opening it spews rust particles on the windshield, you should replace the heat exchangers. Also, if opening it causes you to immediately turn blue or purple (not just hair, but skin color) and become unconscious, you (or your estate) should definitely replace the heat exchangers.The second lever from the top controls the lights on the White House Xmas tree. Move it to the middle to turn on the lights, and all the way to the right to fire 4500 Megatons of Nukes at Iran.The bottom lever on the dash is used to replace the windshield when it becomes scratched or pitted with rock chips. It also determines how much hot air goes to your feet as opposed to your head. For example, let's say the engine is completely warmed up and the hot air is burning your feet. If it's a cold day, you can flip the lever to the other side and shoot hot air onto the windshield so it cracks and shatters. Then call your insurance company (you do have insurance, don't you?)The lever between the seats controls the oil mist spray device. When the engine is warmed up, this lever allows you to blow oil mist into the passenger cabin. Using the top dash lever lets you select whether you want the oil mist to coat the inside of the windshield or to just circulate around your feet. On a newer Pooschey, you have 2 levers on the floor between the seats. The left hand lever lets you open the left side vents which are aimed so they burn the feet of the person in the right hand seat, and the right hand lever lets you open the right side vents which are aimed so they burn the feet of the person in the left hand seat. Of course, each lever will also burn just the tops of the feet of the person in the other seat. If you are driving in the rain (or even stopped in the rain after the car has broken down), these levers also let you spray a fog of water vapor on the windshield, so no one can see in or out of the car -- sort of like privacy glass.