C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Dec 6, 2017 | 11:39 AM
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Claudio Silvreti's Avatar
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Does anyone know what this part is, and what it does? It sits above the thermostat. I appresieer your reply.
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Old Dec 6, 2017 | 12:04 PM
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Thermal Vacuum Switch (TVS). It activates various emissions equipment once engine temperature rises. Aftermarket providers carry these.
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Old Dec 6, 2017 | 12:46 PM
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Hi Claudio,
Welcome!
First post!
In addition to Mike's information it looks like the top 'nipple' has been broken off the switch... I don't know if that's causing you problems or not.
Regards,
Alan
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Old Dec 6, 2017 | 12:52 PM
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Yep. Emissions related parts. A lot of people remove all emission related parts if they can get away with it. I think I have a working TVS from my '77 in the attic. It's yours if you want it. But you may just want to convert away from the emissions stuff. LMK

-Stroke
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Old Dec 6, 2017 | 05:01 PM
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They aren't cheap... don't lose them for those that take off the smog equipt. and ever want to bring it back. They run $40-$50 on eBay.

Also, what's up with the hose that comes off the tee close to the TVS switch that has a flat head screw in it (that's what it looks like in the pic)? Is it the one where the nipple is broken off that it should go on? Depends on the year/setup on how your routing should be, so you'll want to check a vacuum hose diagram out too if you're having issues.
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Old Dec 6, 2017 | 06:04 PM
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With all the above..

Here is a diagram of the hoses for the system if you need it. Also, you didn't say what year the car was and you might think about adding that to your "about me" page so that if you don't people can click on it and figure it out. I'm guessing (from the chevy orange paint) that's it's an early 77 or older.

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Old Dec 7, 2017 | 12:21 AM
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Hi,
thanks for the answers.
Its a '76 (september)
regards,
Claudio
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