Heater Fan Switch, Where is the heater fan switch? |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Heater Fan Switch, Where is the heater fan switch? |
UKed |
Nov 27 2016, 09:36 AM
Post
#1
|
Newbie Group: Members Posts: 5 Joined: 5-December 14 From: United Kingdom Member No.: 18,189 Region Association: None |
Hi
An easy question for you. I'm trying to get the heater fan to work on my 1973 914 2.0lt. The fan motor runs when I wire it direct to the battery. I have a wiring diagram that shows a switch but where is the switch on the car? (IMG:style_emoticons/default/confused24.gif) Thanks - UKed |
bandjoey |
Nov 27 2016, 09:41 AM
Post
#2
|
bandjoey Group: Members Posts: 4,926 Joined: 26-September 07 From: Bedford Tx Member No.: 8,156 Region Association: Southwest Region |
Small red pull up lever just south of the shifter. There's a small square black cover next to it that says Defrost on off. Pull up it starts the fan (IMG:style_emoticons/default/welcome.png)
Attached thumbnail(s) |
steuspeed |
Nov 27 2016, 02:19 PM
Post
#3
|
Senior Member Group: Members Posts: 1,006 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest |
There should be a green wire attached to the lever. When you pull the lever it completes the circuit to ground.
|
UKed |
Nov 27 2016, 03:19 PM
Post
#4
|
Newbie Group: Members Posts: 5 Joined: 5-December 14 From: United Kingdom Member No.: 18,189 Region Association: None |
Brilliant thanks Steuspeed. i will remove the central console and have a look.
|
UKed |
Nov 27 2016, 03:20 PM
Post
#5
|
Newbie Group: Members Posts: 5 Joined: 5-December 14 From: United Kingdom Member No.: 18,189 Region Association: None |
and thanks to Bandjoey
|
BeatNavy |
Nov 27 2016, 04:04 PM
Post
#6
|
Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Just more info: the green wire in the tunnel under the shifter may be hiding in there. Fish it out with a dental pick or something. It should connect to the tab on the heater lever in bandjoey's picture. When the lever is pulled up far enough ("max" heat) that green wire will ground the relay that's farthest back on the relay board (IIRC) via pin 11 on the 14 pin connector. That relay then provides power to the fan. So, if it's not working check: the green wire is connected, the lever is far enough up, the 14 pin-connector is connected, the relay is getting power, and the relay itself is serviceable.
At least that's my understanding of how it works. |
Tbrown4x4 |
Nov 28 2016, 05:58 AM
Post
#7
|
Senior Member Group: Members Posts: 703 Joined: 13-May 14 From: Port Orchard, WA Member No.: 17,338 Region Association: None |
I just went through this. The URO fan relay had a broken post inside. New relay took care of it.
And yes, it is the rear-most relay. |
porschetub |
Nov 29 2016, 01:25 AM
Post
#8
|
Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Just more info: the green wire in the tunnel under the shifter may be hiding in there. Fish it out with a dental pick or something. It should connect to the tab on the heater lever in bandjoey's picture. When the lever is pulled up far enough ("max" heat) that green wire will ground the relay that's farthest back on the relay board (IIRC) via pin 11 on the 14 pin connector. That relay then provides power to the fan. So, if it's not working check: the green wire is connected, the lever is far enough up, the 14 pin-connector is connected, the relay is getting power, and the relay itself is serviceable. At least that's my understanding of how it works. Rob mine is redundant now as I have headers on my six ,but the wire I had connected was black when I got the car from the PO. I would like to use it to as a switch for a small electric defroster I will install,did the wire colour change for different years or did I just find the wrong one on there ? |
BeatNavy |
Nov 29 2016, 04:12 AM
Post
#9
|
Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Just more info: the green wire in the tunnel under the shifter may be hiding in there. Fish it out with a dental pick or something. It should connect to the tab on the heater lever in bandjoey's picture. When the lever is pulled up far enough ("max" heat) that green wire will ground the relay that's farthest back on the relay board (IIRC) via pin 11 on the 14 pin connector. That relay then provides power to the fan. So, if it's not working check: the green wire is connected, the lever is far enough up, the 14 pin-connector is connected, the relay is getting power, and the relay itself is serviceable. At least that's my understanding of how it works. Rob mine is redundant now as I have headers on my six ,but the wire I had connected was black when I got the car from the PO. I would like to use it to as a switch for a small electric defroster I will install,did the wire colour change for different years or did I just find the wrong one on there ? Hey Porschetub! Pretty sure that wire is green/white on all years, but I could be wrong. Checking back on the wiring diagrams, I see it actually goes to pin 9 on the 14 pin connector (not 11 like I said in post above). Check the continuity between those two to be sure. |
Dave_Darling |
Nov 29 2016, 11:39 PM
Post
#10
|
914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
|
Lo-Fi Version | Time is now: 17th May 2024 - 10:00 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |