35DegC (95F) Switches 93060611701 vs 93060611703

[ahh911]

Hello,
I could sure use some help. My 35DegC switch on my 81 911SC is broken. It is unavailable and is not superceeded. It is part number 93060611701, normally open and it closes above 35DegC. It is located on the crankcase breather lid.


Would someone be able to test or knows if 93060611703 is also a normally open switch?

The only hint I have that it is instead normally closed comes from the following link, but it is not necessarily correct as I don't know if the schematic is the right one.

http://forums.pelicanparts.com/porsche-911-technical-forum/951491-anyone-know-how-these-temp-switches-work.html

I can pick up a 93060611703 switch rebranded as TS-482 and others. I've contacted the distributors, spoke with their parts people, but they have to order the parts in and have no data at all on it.

Please let me know,
thank you,
Phil

[San Arthur]

I installed n a 1983 911SC and it works the same as before.

[ahh911]

Hi San,
Thank you for that, Is this a normally open switch? (open when below 35C)

I ended up cutting off the top, removing the internals and replacing them with a 45Deg normally open switch rated to an even higher operating max temperature and sealing back up. I called every distrubtor, napa store etc.. and they couldn't tell me if the switch you are holding was N/O or N/C, so this is one of the few areas I improvised, but I tested the switch that I "modded" in H20, just fine. But if this is the switch that you can buy at R/Auto and other places online, then wow! You'll save the next guy from underriching and then overrching (perhaps?) the mixture over operating temperatures, but only if it's N/O.

Actually, I just noticed the porsche logo, where did you buy it from? Does it have a part number? ..

Phil

[ahh911]

I stuffed this inside the old shell of the original sensor. Made sure that common was the outside of the new sensor and removed it's outer silicone sleeve. Shaved the edges down a bit, pushed it in and siliconed up the top, one wire soldered to a connector fitting, the other, common went back to the a nut on the breather cover to common/ground. 5A part, can't remember but found the max operating temp was around 150C.

Phil

[mopydick]

> Is this a normally open switch? (open when below 35C)

Yes.

Below 35degC its open.

I just happen to be going through an '83 CIS system checking the sensors.

[ahh911]

Problem was, Porsche doesn't sell this one anymore, there is a normally closed 35 switch they sell, but that would enrichen the mixture when it should be leaning and vice versa above and below 35. Maybe better off just grounding it then, don't know. I tried to find a similar switch with reasonable max operating temperature, I think there was a 70C switch, right footprint for furnaces or something, same company that manufactured the porsche one, but 70C was a little too far from 35C for my liking. R/Auto and some other retailers sell a switch that is 35C for a reasonable price, but they won't tell you if it's N/O, so I called their distributor who said they didn't have any on hand for the engineer to measure, and so on. So I just went with the 45DegC solution, the sensor I've shown fits right into the lower end of the tube, nice and snug so it's naturally grounded to it's outer shell. So it works out pretty good. I tested around 3 of them, they vary in on/off by probably +/- 5 degree and some variation in hystersesis, so test them first. I'd like to hear from someone who knows where to source the original style, like from the sellers I've mentioned and tell us if they are indeed N/O switches, that would help out the next gen of 911 builders.

Phil

[Gretz]

Ever find a solution to this? I am working on this as well, documenting here:

https://forums.pelicanparts.com/porsche-911-technical-forum/1156114-help-35-degree-temperature-switch-911sc.html

[ahh911]

Solution is still working fine. I get 75% off idle enrichment when cold. 35 or 45 degrees makes no difference, but there is a wide array of temperatures to choose from.

Again, as written above, I cut open the old sensor and stuffed an amazon sensor inside the shell (dremelled the new sensor a little on the edges so it would slide in snug), siliconed up the top and what can I say, nothing to it. Only make sure sure that the case of the sensor is ground. Some sensors have isolated outer cases, some don't.

[AndrewCologne]

VDO Part-number is: 232-011-017-148D

https://vdo-webshop.nl/en/temperature-switches/830-vdo-temperature-switch-35c-m14-410359068932.html

Quote from the page "Contact close as temperature rises"

[Gretz]

Andrew, what's the source for your information that the switch is normally open? We've all agreed that the Bentley is not a reliable source. I am having trouble confirming that it's NO, especially since workshop manual screenshots appear to show it as NC.

[AndrewCologne]

3 Options:

1. Test a working 35°C switch -> by checking the green/yellow wire from the connector on the traverse in fron of the firewall on the left side behind the engine. That connector holds all lambda control relevant wirings. here you can check using a DMM

2. If you're not sure if the switch works properly, then disconnect the green/yellow wire from that plug and drive. When on cold idling oil temp is cold/below 35° then the duty cycle from the ECU at the test port located at the left engine compartment or directly at the ECUs pin 17, the duty cycle should rise to 75% for 2 secs when hitting the throttle. if it doesn't, .... lead that wire to ground to do the inverse test

3. trust the original workshop manual:

[Gretz]

Andrew, this is definitely good info. My copy of the workshop manual does not have this diagram. I don’t have a working switch to test, so in the absence of a forum member testing this on their car, your diagram will have to serve as the most reliable reference. I’ve also reached out to Tony to confirm, as he tested a 35C switch previously. Thanks for the help.

[AndrewCologne]

Originally Posted by Gretz

Andrew, this is definitely good info. My copy of the workshop manual does not have this diagram.

http://p914-6info.net/911_Manuals/Porsche%20911%20Workshop%20Manual%201972-1983.pdf

There on page 860.