Hello, No I don't have a fetish for temp senders, it's just that I keep coming up with issues that I don't understand. I have a 1970 auto stick Ghia and when I look at the Bentley wiring diagram, it seems to show one transmission temperature sender and one dash transmission warning light.
Yesterday, with the engine out of the car, I was able to clean years of grime and grease off the car and found 4 electrical things screwed into the transmission. One has 3 electrical prongs and I believe it is the starter cutout switch, one has 2 prongs and is the back-up light switch. Then I see 2 units that both have one electrical prong each. They both appear to be transmission temperature senders, yet the Bentley only shows one temp sender in the diagram.
Also, if in fact they both are temperature senders for the transmission, how do they light one bulb with two sensors? I don't see any reference to it in the schematic.
Gee, I sure hope these are the last temperature sender questions I have, even I am getting tired of it!!
Thank you for your help and your patience.
Hiya auto,
This diagram might help explain what's going on in 1970............
(http://i201.photobucket.com/albums/aa85/Bookwus1/Bug/Type_1-1600_USA_from_august_1969-2.jpg)
Notice the two F13s? They are the temp sensors to which you are referring. Notice also how they are wired into the three prong switch F14. That switch trips the dashlight K9.
VW did go to a single temp sensor later on in AutoStick production (Anybody out there know what year that was?) and that's what your Bentley is referring to.
Mike,
The 1600 TP engine'd ones don't have two. So sometime in the '70/'71 production year. My '71 just has one, the GB I pulled out of the '70 donor had two.
BTW, it's the 140 Deg one that was fitted to '71's and later. 125(? or 120) is the other one.
HTH
Sean
Hiya Sean,
Quote from: volkenstein on 05 August 2009, 02:19 .....My '71 just has one,
No kidding. I had thought that change was later, like when VW added the park feature. Boy! Hang around here and you get an education.
Quote....BTW, it's the 140 Deg one that was fitted to '71's and later. 125(? or 120) is the other one.
Yeah, on the two sensor set-up that I have, one is 10 - 125C and the other is 10 to 140C
Thanks guys, now I have a better understanding of how the senders are wired. Ahh so much to learn and so little brainpower.
Hiya auto,
Make sure you take notes. There will be a quiz before recess. :o
Quote from: Bookwus on 04 August 2009, 17:20
VW did go to a single temp sensor later on in AutoStick production (Anybody out there know what year that was?) and that's what your Bentley is referring to.
Hey there all,
The dual temp sensor/temp range switch was phased out in late August of 1970. This was also the time when the ring and pinion gear was changed from a 4.375:1 to the better 4.125:1 ratio. The tranny in my '69 is the old style.
Any A/S tranny before the end of August 1970 will have the 4.375:1 ring and pinion and dual temp sensors with a temp range switch.
Any A/S tranny after the end of August 1970, will have the 4.125 ring and pinion and a single temp sensor and no temp range switch.
The newer tranny I picked up from ajcarguy72 a few months ago is the later style and it came out of a mid August 1970 bug.
Hope that helped shed some light on the matter.
-Evan.
Hi,
the two temp senders go thru a three pronged switch..
so they are switched individually... Drive one and drive 2..
later on VW found that the sender on drive One wasn;t needed..
so, that did away with two items...
see the electrical diagram from Mike... showing the two senders etc...
I have read many books on VWs... and a few show that the 1500 engine
had the 4.125 to 1 ratio Differential..... as the 4,375 to 1 was used on the 1300 engined autosticks in Europe..
but most of the info I can find says the 1500 had only 4.375 to 1 ratios...
cheers
LEE
Quote from: 68autobug on 07 August 2009, 17:56
had the 4.125 to 1 ratio Differential..... as the 4,375 to 1 was used on the 1300 engined autosticks in Europe..
but most of the info I can find says the 1500 had only 4.375 to 1 ratios...
cheers
LEE
Hey there Lee,
What year spread are you referring to? In any case, I am going off of the info I got from a few books of my own and the actual info with my 2 tranny's. The one currently in my '69 is the early 4.375:1 with 2 temp senors and a range/temp switch, and the other one is from a later 1970 bug with the 4.125:1 R&P (I checked the gears) and 1 temp sensor with no temp/range switch. My Bently bible only goes up to 1970, it does not have any of the later A/S info in it. The other off the wall books I have, briefly mentions the late A/S but won't go into any helpful detail.
Also, I have no idea the actual engine that was in mine, It had a later '74 1600cc A/S internally decimated engine in it when I got it.
-Evan.