Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
86FlatSix
 
JQ911's Avatar
 
Join Date: Mar 2012
Location: from the streets of San Francisco
Posts: 1,335
Garage
86 Automatic Control Heater

Pardon my ignorance but when I compared my auto heat control dial on my 86 vs my cousin's 87, his dial console had a single lever red tip handle going up/down. I've seen others with two (2) levers on early models. How come mine did not have a lever just the dials. The heat in the cabin feels normal but I just need to know if I am missing a lever. I compared the housing on his and mine did not have sloted holes for the lever, normal?

__________________
74 BMW 2002 (rust rocket)
86 911 Coupe (weekend warrior)
09 997.2 C2 (semi-daily)
Old 01-17-2014, 08:05 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
wwest's Avatar
 
Join Date: Jul 2009
Location: Stunningly Beautiful Pacific NW.
Posts: 5,293
Garage
Those with no levers at usually have auto-heat, servomotor to linearly open/close both heat paths simultaneously.
Old 01-17-2014, 08:39 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Nico911's Avatar
 
Join Date: Nov 2012
Location: Montréal, Canada
Posts: 453
My 85 is the same, no lever. I have the auto heat option, but it's broken, I'll fix it later this year.

Cheers.
__________________
1985 911 Targa (sold)
2001 996 Twin Turbo (sold)
2001 996 C4
Old 01-17-2014, 09:25 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
geoz's Avatar
 
Join Date: Jan 2009
Location: Tasmania, Australia
Posts: 418
Same here ; no lever only the dial since it has auto heat.

cheers hg
__________________
cheers

hg

1988 911 Cabrio
Old 01-17-2014, 11:29 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
awhnry's Avatar
 
Join Date: Jun 2012
Location: Loudon Tn
Posts: 188
Garage
My '87 has dial and levers but what I found was that the dial controls additional fans in the kickboards for distribution of heat.
__________________
1987 911 Carrera (cassis red sunroof coupe)
2003 Toyota MR-2 Spyder
2006 Mazda Mazdaspeed 6
1992 Mazda Miata(sunburst yellow garage queen)
2001 Ford Excursion
Old 01-17-2014, 11:42 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
wwest's Avatar
 
Join Date: Jul 2009
Location: Stunningly Beautiful Pacific NW.
Posts: 5,293
Garage
Quote:
Originally Posted by awhnry View Post
My '87 has dial and levers but what I found was that the dial controls additional fans in the kickboards for distribution of heat.
Yes, you do not have auto-heat.
Old 01-17-2014, 11:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
86FlatSix
 
JQ911's Avatar
 
Join Date: Mar 2012
Location: from the streets of San Francisco
Posts: 1,335
Garage
That explains it! All the while I thought I had a broken lever somewhere. Thanks!
__________________
74 BMW 2002 (rust rocket)
86 911 Coupe (weekend warrior)
09 997.2 C2 (semi-daily)
Old 01-17-2014, 11:55 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
awhnry's Avatar
 
Join Date: Jun 2012
Location: Loudon Tn
Posts: 188
Garage
That was my final determination: no auto heat, just extra fans beyond those that turn on when you pull up the levers. And of course since I didnt get an owners manual, no idea what I had.
__________________
1987 911 Carrera (cassis red sunroof coupe)
2003 Toyota MR-2 Spyder
2006 Mazda Mazdaspeed 6
1992 Mazda Miata(sunburst yellow garage queen)
2001 Ford Excursion
Old 01-17-2014, 12:12 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: Jan 2009
Location: Norcross, GA
Posts: 627
Quote:
Originally Posted by Nico911 View Post
My 85 is the same, no lever. I have the auto heat option, but it's broken, I'll fix it later this year.

Cheers.
I await your report on that!
From what I've seen, it seem next to impossible. My heat works, just not the auto part. It's either full on HOT or off. When I need it, I just turn the knob until I get a little hot and then turn it back off again. At least in ATL, I don't need it that much.
__________________
'85 RoW 911 Coupe
'65 356 SC
'72 BMW 2002Tii
'10 Cayenne
'20 Ram Longhorn
Old 01-17-2014, 12:14 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered
 
Join Date: Apr 2005
Location: outta here
Posts: 53,250
The early auto heat controllers did have a lever which was used in emergencies, eg. when the controller failed.

When you have a dial that goes to 3, and a lever, you have the manual system with booster fan speed control.

If your dial goes from 0 to 9, you have auto heat.

JR
Old 01-17-2014, 12:30 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered
 
wwest's Avatar
 
Join Date: Jul 2009
Location: Stunningly Beautiful Pacific NW.
Posts: 5,293
Garage
Question then...if you have auto-heat how do you turn on the footwell fans...?

Just curious.
Old 01-17-2014, 12:45 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered
 
Join Date: Apr 2005
Location: outta here
Posts: 53,250
Not all cars had the footwell fans. They were introduced in 1983, on the turbos. On the cars that had the fans, they were controlled by the controller. The lower dial positions ran the fans in low and as you requested more heat in the higher dial settings, the fan speeds were increased. It's spelled out in the owners manuals.

JR
Old 01-17-2014, 01:55 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
 
Registered
 
wwest's Avatar
 
Join Date: Jul 2009
Location: Stunningly Beautiful Pacific NW.
Posts: 5,293
Garage
Quote:
Originally Posted by javadog View Post
Not all cars had the footwell fans. They were introduced in 1983, on the turbos. On the cars that had the fans, they were controlled by the controller. The lower dial positions ran the fans in low and as you requested more heat in the higher dial settings, the fan speeds were increased. It's spelled out in the owners manuals.

JR
But my question was: with the auto-heat control knob in place instead of footwell fan control knob where is the footwell fan control knob? Or is it not possible to have auto-heat AND footwell fans?
Old 01-17-2014, 02:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Registered
 
Join Date: Apr 2005
Location: outta here
Posts: 53,250
Footwell fans and auto heat are not mutually exclusive. On the cars with auto heat that had the fans, the auto heat controller controls the fan speeds. You tell it via the dial position how hot you want the cabin and it regulates the position of the heater valves and the fan speeds.

You do not have separate control over the fan speeds but generally the first few dial positions ran the fans in the low speed, the middle dial positions ramped the speed up tp position 2 and the last couple dial positions gave you hi speed.

JR
Old 01-17-2014, 02:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
Registered
 
wwest's Avatar
 
Join Date: Jul 2009
Location: Stunningly Beautiful Pacific NW.
Posts: 5,293
Garage
So I guess if I wanted high heat but just enough airflow to maintain windshield forward vision then I would be SOL.

Germans...bad as the Japanese for human factors engineering.
Old 01-17-2014, 02:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
Registered
 
Join Date: Apr 2005
Location: outta here
Posts: 53,250
That's why I like the manual system the best. People ***** about it because they don't bother to learn how it works but it is very adjustable.

JR
Old 01-17-2014, 03:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
6 cylinder symphony
 
Join Date: May 2006
Location: Houston, TX
Posts: 962
Garage
Autoheat is fine if the system is working.

If you want the fans all the way up, dial the system up to 9. Everything turns on full blast.

I had to completely rebuild my autoheat module. The plastic couplers were broken. Something was wrong with my circuit board. Once all those things were replaced, it has worked just fine.

It's way better than the two levers.
__________________
'84 3.2 Targa
'89 964 Coupe

"What do you mean NEXT project?" - my wife
Old 01-17-2014, 04:22 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered
 
wwest's Avatar
 
Join Date: Jul 2009
Location: Stunningly Beautiful Pacific NW.
Posts: 5,293
Garage
Quote:
Originally Posted by Kidasters View Post
Autoheat is fine if the system is working.

If you want the fans all the way up, dial the system up to 9. Everything turns on full blast.

I had to completely rebuild my autoheat module. The plastic couplers were broken. Something was wrong with my circuit board. Once all those things were replaced, it has worked just fine.

It's way better than the two levers.
Nothing, NOTHING, betters manual HVAC controls.

Not even in a Lexus.....

On a cold wintery day the secret, foremost secret, to keeping the interior windshield defogged is slightly lowered windows, HIGH heat ONLY to the windshield, but with low blower speed to prevent driver/passenger discomfort.

Bundle up to keep warm.

Old 01-17-2014, 05:57 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
Reply


 


All times are GMT -8. The time now is 09:42 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.