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UKed |
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#1
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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 |
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#2
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bandjoey ![]() ![]() ![]() ![]() Group: Members Posts: 4,934 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)
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steuspeed |
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#3
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,010 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.
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UKed |
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#4
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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.
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UKed |
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#5
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Newbie ![]() Group: Members Posts: 5 Joined: 5-December 14 From: United Kingdom Member No.: 18,189 Region Association: None ![]() |
and thanks to Bandjoey
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BeatNavy |
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#6
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Certified Professional Scapegoat ![]() ![]() ![]() ![]() Group: Members Posts: 2,951 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 |
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#7
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Senior Member ![]() ![]() ![]() Group: Members Posts: 707 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 |
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#8
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 4,796 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 |
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#9
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Certified Professional Scapegoat ![]() ![]() ![]() ![]() Group: Members Posts: 2,951 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 |
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#10
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914 Idiot ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 15,151 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California ![]() ![]() |
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