Vaccum Switch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tblough · 12-01-2005, 08:33 PM

Hello,

I'm trying to find a part number or description for a vaccum switch on my 1984 250ci inline six. It is located almost in the center of the block on the passenger side. Any ideas how I can find it? I cannot locate it in the shop manual.

THanks,

beaterC10 · 12-02-2005, 08:38 AM

Try searching on "GM Parts Online" you should get several vendors that sell GM parts. They normally have a catalog you can look up GM part numbers in.

Slonaker · 12-02-2005, 10:55 AM

If you want to know how it works (what temp it switches at, what it controls, etc.) I have no idea. If you just want to replace it, any auto parts store should be able to provide you with a replacement. When I changed mine, they just needed to know the application, the number of ports, and the color. I think the color identified the temp at which it started working.

Slonaker

Edit: I am not positive, but I want to say that it had a part number stamped on the portion that comes in contact with the coolant.

tblough · 12-03-2005, 06:45 PM

Here is a picture of what I'm talking about http://www.geocities.com/timblough/whatisthis.html

Slonaker · 12-03-2005, 07:18 PM

I can't tell anything from the pic, and I am not familiar with 6 cylinders. Are you sure it is a vacuum switch? It looks more like a sender of some type, unless it is broken.

Slonaker

TrainD5115 · 12-03-2005, 07:24 PM

That doesn't look like a vacuum port. Ports have vacuum lines running to them. This is a vacuum port.

That looks like some sort of sensor.

tblough · 12-03-2005, 07:38 PM

It used to have a vaccum line running to it. The plastic is broken. that is why I am looking for a new one. I cracked it, the machine shop that did the rebuild finished it off. They don't know what part it is for either. Does anyone know of an old chevy dealership mechanic?

TrainD5115 · 12-03-2005, 11:46 PM

LMC Truck has all the TVS parts you can shake a stick at. Get the number off of the switch and the color. Most parts stores should have these or be able to get them. Don't forget to count the number of ports.

tblough · 12-04-2005, 12:53 AM

Finding the part information, including part number, is the problem I am having. There is no visual part number.

TrainD5115 · 12-04-2005, 02:15 AM

LMC has a catalog with pictures. You might be able to look online and match it up. If not, you can order one or try to download what you need. That's the best I can tell you. Good luck.
http://www.lmctruck.com/pdfcatalogs/...9CC099-105.pdf Scroll down to pg 104.

12-01-2005, 08:33 PM	#1
tblough Registered User Join Date: Mar 2003 Location: Ohio Posts: 42	Vaccum Switch Hello, I'm trying to find a part number or description for a vaccum switch on my 1984 250ci inline six. It is located almost in the center of the block on the passenger side. Any ideas how I can find it? I cannot locate it in the shop manual. THanks, __________________ tblough I love my Truck! '84 Custom Deluxe C10 LWB Inline 6 250ci 4.1L 2wd

12-02-2005, 08:38 AM	#2
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	Re: Vaccum Switch Try searching on "GM Parts Online" you should get several vendors that sell GM parts. They normally have a catalog you can look up GM part numbers in.

12-02-2005, 10:55 AM	#3
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: Vaccum Switch If you want to know how it works (what temp it switches at, what it controls, etc.) I have no idea. If you just want to replace it, any auto parts store should be able to provide you with a replacement. When I changed mine, they just needed to know the application, the number of ports, and the color. I think the color identified the temp at which it started working. Slonaker Edit: I am not positive, but I want to say that it had a part number stamped on the portion that comes in contact with the coolant. __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado Last edited by Slonaker; 12-02-2005 at 10:57 AM.

12-03-2005, 06:45 PM	#4
tblough Registered User Join Date: Mar 2003 Location: Ohio Posts: 42	Re: Vaccum Switch Here is a picture of what I'm talking about http://www.geocities.com/timblough/whatisthis.html __________________ tblough I love my Truck! '84 Custom Deluxe C10 LWB Inline 6 250ci 4.1L 2wd

12-03-2005, 07:18 PM	#5
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: Vaccum Switch I can't tell anything from the pic, and I am not familiar with 6 cylinders. Are you sure it is a vacuum switch? It looks more like a sender of some type, unless it is broken. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

12-03-2005, 07:24 PM	#6
TrainD5115 North Coast, baby! Join Date: Jun 2004 Location: Toledo, OH Posts: 437	Re: Vaccum Switch That doesn't look like a vacuum port. Ports have vacuum lines running to them. This is a vacuum port. That looks like some sort of sensor. __________________ Brad 79 Scottsdale C20 350/350 3.73's Still running full CA smog gear!

12-03-2005, 07:38 PM	#7
tblough Registered User Join Date: Mar 2003 Location: Ohio Posts: 42	Re: Vaccum Switch It used to have a vaccum line running to it. The plastic is broken. that is why I am looking for a new one. I cracked it, the machine shop that did the rebuild finished it off. They don't know what part it is for either. Does anyone know of an old chevy dealership mechanic? __________________ tblough I love my Truck! '84 Custom Deluxe C10 LWB Inline 6 250ci 4.1L 2wd

12-03-2005, 11:46 PM	#8
TrainD5115 North Coast, baby! Join Date: Jun 2004 Location: Toledo, OH Posts: 437	Re: Vaccum Switch LMC Truck has all the TVS parts you can shake a stick at. Get the number off of the switch and the color. Most parts stores should have these or be able to get them. Don't forget to count the number of ports. __________________ Brad 79 Scottsdale C20 350/350 3.73's Still running full CA smog gear!

12-04-2005, 12:53 AM	#9
tblough Registered User Join Date: Mar 2003 Location: Ohio Posts: 42	Re: Vaccum Switch Finding the part information, including part number, is the problem I am having. There is no visual part number. __________________ tblough I love my Truck! '84 Custom Deluxe C10 LWB Inline 6 250ci 4.1L 2wd

12-04-2005, 02:15 AM	#10
TrainD5115 North Coast, baby! Join Date: Jun 2004 Location: Toledo, OH Posts: 437	Re: Vaccum Switch LMC has a catalog with pictures. You might be able to look online and match it up. If not, you can order one or try to download what you need. That's the best I can tell you. Good luck. http://www.lmctruck.com/pdfcatalogs/...9CC099-105.pdf Scroll down to pg 104. __________________ Brad 79 Scottsdale C20 350/350 3.73's Still running full CA smog gear! Last edited by TrainD5115; 12-04-2005 at 02:22 AM.



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