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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Gregg72340 on October 03, 2010, 07:23:56 pm

Title: What is this on my water neck?????
Post by: Gregg72340 on October 03, 2010, 07:23:56 pm

I have no pictures but its an 85 c-10 1/2 ton 305-auto.  On my water neck is two what looks like screw in pieces, one has vaccum lines attached to it, and the other is broken off.  I did find an electrical wire unhooked near by, does anyone know what this broken piece is????

Thanks
Gregg

Title: Re: What is this on my water neck?????
Post by: VileZambonie on October 03, 2010, 07:32:52 pm

Spell check and take pix so we can see exactly what you are talking about.

The device with the vacuum hoses is a thermostatic vacuum switching valve. (TVSV)

It's job was to allow or block vacuum depending on temperature. Don't know what you're talking about for the other one unless you can take a pic or describe it better.

Title: Re: What is this on my water neck?????
Post by: Gregg72340 on October 03, 2010, 08:42:27 pm

The truck is three hours away and I forgot to take a picture of this, I assumed it was some sort of temp sender because i found an electrical connector laying near it, and nothing else is unhooked.  It looks like some sort f sender that has been snapped off, the part is still there that is shsaped for a wrench for you to scew it in, so I guess I will take a pic when I go back in three weeks

Title: Re: What is this on my water neck?????
Post by: Irish_Alley on October 04, 2010, 01:52:27 am

http://www.delbridge.net/vacuum.html
sgtdel took some pics see if you see it in there then tell us what pic and were abouts it is

Title: Re: What is this on my water neck?????
Post by: Gregg72340 on October 04, 2010, 11:10:50 am

I looked at those pics.  There are two pieces stickin out of the water neck.  The one that is still on mine is the one that is in those pics.  I will just ahve to get a pic next time I go up and try it then

Thanks