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W113 Pagoda SL Group
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Low Temperature Switch
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Topic: Low Temperature Switch (Read 711 times)
TJMart
Full Member
Silver
USA, NC, Matthews
Posts: 370
Low Temperature Switch
«
on:
October 10, 2024, 20:18:34 »
I have done some research on the 17 degree low temperature switch for my 1970 280 SL.
I have always had a slow idle when the car is first started so I tested mine and it is not working. I contacted the Classic center and it is the dreaded NLA!
Does anyone know if there is a replacement switch that will work or a source for a new one?
Thanks in advance!
Tony
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Tony
1970 280SL, 4 Speed
Pawel66
Full Member
Platinum
Poland, Mazowieckie, Konstancin-Jeziorna
Posts: 5493
Re: Low Temperature Switch
«
Reply #1 on:
October 10, 2024, 21:25:24 »
I found temperature switches for my Ponton cold start system there:
https://www.americanvolt.com/
I really had trouble finding parts from the usual suppliers (Delphi, Bosch etc.) knowing the on or off temperature, thread dimension, etc. It was easy to fin switches that are switching on cooling fans, for instance, but I needed normally closed switch with certain thread dimensions and had troubles with it.
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Pawel
280SL 1970 automatic 180G Silver
W128 220SE
W121 190SL
G-class
Bshaunessy
Full Member
Senior
Canada, British Columbia, Invermere
Posts: 126
1957 190 SL; 1970 280 SL; 1975 450 SL; 1971 300 SE
Re: Low Temperature Switch
«
Reply #2 on:
October 11, 2024, 02:55:42 »
I know my car fairly intimately (1970 280 SL,auto) but was unaware of a low temperature switch? Where, physically, is it under hood and what does it do?
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rwmastel
Full Member
Platinum
USA, OH, Canal Winchester
Posts: 4634
Pagoda SL Group: 20+ years and going strong!
Re: Low Temperature Switch
«
Reply #3 on:
October 11, 2024, 04:49:45 »
Is the low temp switch = thermo time switch?
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Rodd
Did you search the forum before asking?
2017 C43 AMG
2006 Wrangler Rubicon
1966 230SL auto "Italian"
WRe
Full Member
Platinum
Germany, Hessen, Seeheim-Jugenheim
Posts: 1453
Re: Low Temperature Switch
«
Reply #4 on:
October 11, 2024, 06:16:58 »
Hi,
the low temperature switch or 17-degree switch is part of the Emission Control System (ECS) installed in model years 1970/71 in the US.
Whereas all our vehicles have a Thermo Time Switch (TTS) which improves cold starting. See Technical Manual.
...WRe
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rwmastel
Full Member
Platinum
USA, OH, Canal Winchester
Posts: 4634
Pagoda SL Group: 20+ years and going strong!
Re: Low Temperature Switch
«
Reply #5 on:
October 11, 2024, 11:15:52 »
Oh, emissions. I was looking under starting aids. Thanks!
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Rodd
Did you search the forum before asking?
2017 C43 AMG
2006 Wrangler Rubicon
1966 230SL auto "Italian"
TJMart
Full Member
Silver
USA, NC, Matthews
Posts: 370
Re: Low Temperature Switch
«
Reply #6 on:
October 11, 2024, 18:22:33 »
Bshaunessy,
As mentioned by WRe the 17 degree switch is part of the emission control system for cars built for the US.
If you car is equipped with the Emissions system, the low temperature switch works with the relays and the 2 way valve to retard the timing and in effect increases the idle until the engine warms up. It is located above the rear of the fuel injection pump threaded into the engine block.
Take a look at the technical manual and the you tube video for a good overall explanation of the emissions system.
https://www.sl113.org/wiki/Electrical/EmissionControlSystem#Devices
Tony
«
Last Edit: October 11, 2024, 18:27:38 by TJMart
»
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Tony
1970 280SL, 4 Speed
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Low Temperature Switch