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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Anybody know what this is called

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G3GM :: G3 Tech :: Engine & Driveline

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Anybody know what this is called Empty Anybody know what this is called

Post by KC77Monte Sat Apr 07, 2018 9:32 pm

Finally got around to finishing up the stuff I was doing on the monte. Changed the belts and flushed the coolant and notice this thing that sets on top of the housing is broken. Took it to the ports store and they have no clue what to call it or where to get one. I figure if anyone will know, you guys will. Thanks....

Anybody know what this is called 20180410
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Post by Limey SE Sat Apr 07, 2018 11:51 pm

Only thing I have known it called is Engine Coolant tempature sensor and has a diff one for idiot lights and Gauges

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Post by Limey SE Sat Apr 07, 2018 11:51 pm

Some Models have it in side of Block and some in the Water neck

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Post by KC77Monte Sun Apr 08, 2018 12:47 am

Thanks Limey. One more question for you. Do you think it will be alright like that, or should I try to locate a new one?
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Post by fasrnur Sun Apr 08, 2018 1:38 am

It's actually called the ported vacuum switch . It's part of the emission system. If you ask for a temp sender, you'll get something with a wire connection on it and not one for vacuum lines.
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Post by Podor Sun Apr 08, 2018 9:31 am

fasrnur wrote:It's actually called the ported vacuum switch  . It's part of the emission system. If you ask for a temp sender, you'll get something with a wire connection on it and not one for vacuum lines.

Fasrnur is right. I think it's officially called a TVS, or thermo vacuum switch. I think it keeps the EGR from functioning until the car warms up. If you aren't running an EGR, just plug it with a pipe plug.
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Post by Mcarlo77 Sun Apr 08, 2018 10:29 am

Anybody know what this is called Chevyp10

Technically, GM calls it an "Exhaust Heat Actuator Vacuum Control Switch".  EGR operated switch looks the same...but, is mounted on top of the intake manifold.  Anyway, lower port vacuum hose goes to Heat Riser and Upper port hose goes to carb vacuum.  If you are planning on replacing it, make sure you get one that is normally "Open" when cool in order to pull vacuum with a cold engine and then "Closes" when heated.  Some TVS's are just the opposite and are "Closed" until heat opens them up.  I believe the EGR switch is one of those.
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Post by KC77Monte Sun Apr 08, 2018 12:13 pm

Thanks guys. You got me closer than the parts guy did.
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Post by Mcarlo77 Sun Apr 08, 2018 1:38 pm

My '77 GM Illustrated Parts Manual shows these switches on the schematics...but, fails to give a part number. I found a couple used ones off Chevys in the JY that tested ok but, there are no meaningful numbers on either for reference.
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Post by KC77Monte Sun Apr 08, 2018 1:52 pm

Mcarlo77 wrote:My '77 GM Illustrated Parts Manual shows these switches on the schematics...but, fails to give a part number.  I found a couple used ones off Chevys in the JY that tested ok but, there are no meaningful numbers on either for reference.

The only numbers I can find on this one is HRD6.
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Post by Mcarlo77 Sun Apr 08, 2018 2:07 pm

Yeah...that's what this one I have says on it. However, I think I found the correct GM part number. The schematics in the manual reference a separate page number where the part numbers are identified. After some digging, they appear to have misprinted the location of the part number. Anyway, it would be GM #3031386. Also, the part number for the EGR switch would be #3031385 (350 engine) and #3036912 (305 engine). Hope this helps.
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Post by KC77Monte Sun Apr 08, 2018 2:21 pm

I'll google all those numbers and see whats pops up. Thanks a ton for all your work/help.
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