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The thermo switch on the left, top timing chain cover, is part of the CIS system, and only feeds signal to the cold start valve on the CIS system. No CIS - no need thermo switch. (Mine was replaced with a regular temp sender for the new efi.) See the top of this post. The CSV only connects to the thermo switch, and pulls power from the starter (3 wires total).
The temp switch next to the crankcase breather, is responsible for illuminating your temperature light in the dash (if the engine is too hot). The circular flat plate, next to it, is the oil cooler thermostat. No need to mess with this, unless you want to replace the o-ring, inside. This contraption, similar to the external thermostat in the right rear wheel well, used a wax plug to open the flow of oil to the engine oil cooler, once the oil is hot.
Cars/years may vary. I'm speaking to a 79 US SC.
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Doug
79 SC Targa w/ ITBs, 2004 Cayenne Turbo
Last edited by na2ub; 12-05-2022 at 09:10 PM..
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