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10-18-2014, 02:18 PM
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#1 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Thermal vacuum switch
The thermal vacuum switch broke on the intake manifold where in the world can I get a new one or is it even necessary
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10-18-2014, 10:42 PM
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#2 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,516
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Re: Thermal vacuum switch
I found a couple at the local pull-a-part for about $1 each. They seem to be mostly a discontinued item at the local parts stores. I think most of the GM versions are basically the same even if they may look different. So check all GM vehicles, not just the trucks. I found one in a front wheel drive car.
A properly working Thermac system does help the motor warm up faster and helps prevent carb icing when the air temps are between 30 to 60 or so and the humidity is high. Once the motor is fully warmed up, it shouldn't be needed any more. If you are having issues with the motor wanting to die/ stumble or idle poorly after driving a mile or so, a broken Thermac system might be the problem. |
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10-18-2014, 11:13 PM
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#3 |
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Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Re: Thermal vacuum switch
Do you mean on the intake manifold, or on the air cleaner body?
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Rich Weyand 1978 K10 RCSB DD. |
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10-19-2014, 07:19 AM
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#4 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
On the intake manifold. I called napa and a couple other places no one has them they also said about being different colors
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10-19-2014, 08:49 AM
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#5 |
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Senior Member
 
Join Date: Jan 2001
Location: Lincoln, Nebraska
Posts: 2,144
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Re: Thermal vacuum switch
My 86 K30 454 I just replaced the 4 port vacuum port switch on the thermostat housing and Oreilly's had a BWD replacement in stock for $28. It is gray colored. Don't have the part number on hand but they found it right off. The GM switch was discontinued.
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'66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed" |
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10-19-2014, 10:32 AM
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#6 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
No one has a 2 port purple top in stock. Can I just jb weld it back together would it still work right?
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10-19-2014, 11:43 AM
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#7 |
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Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Re: Thermal vacuum switch
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Rich Weyand 1978 K10 RCSB DD. |
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10-19-2014, 12:51 PM
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#8 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
Yeah that's what I'm looking for called all over no one has them. I'm going to jb weld it and hope it holds until I find one
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10-19-2014, 01:00 PM
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#9 |
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Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Re: Thermal vacuum switch
Is this not in stock?
http://www.ww.auto-parts-online.com/...cks-pvs45.html
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Rich Weyand 1978 K10 RCSB DD. |
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10-19-2014, 03:14 PM
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#10 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
No
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10-19-2014, 03:57 PM
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#11 |
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Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,200
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Re: Thermal vacuum switch
Bunch available on rockauto if you are not particular to having a purple one.
Blue, Black, Natural, Orange, Green, red. Under electrical & relay->ported vacuum switch. Alex. |
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10-19-2014, 04:30 PM
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#12 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
What is the color difference though. They didn't just make there with a bunch of different colors because they look cool
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10-19-2014, 09:18 PM
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#13 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
Looks like if I go with the edelbrock 2101 intake manifold that part won't be needed neither will the egr and it'll still work with the quadrajet
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10-21-2014, 06:58 PM
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#14 |
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Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,200
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Re: Thermal vacuum switch
Color = opening (or closing) temperature. So, you need to know what you are controlling and what those others controlled. ie: an EFE temp switch won't be any good in place of the EGR temp switch.
Alex. |
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10-21-2014, 10:10 PM
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#15 |
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Registered User
Join Date: Aug 2014
Location: Frederick md
Posts: 178
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Re: Thermal vacuum switch
I believe it's an egr temp switch
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10-22-2014, 10:07 PM
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#16 |
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Registered User
Join Date: Nov 2013
Location: College Station, TX
Posts: 72
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Re: Thermal vacuum switch
Not sure, but I may have been looking for the same thing and 83GMCK2500 posted a bunch of useful GM part numbers which I used to cross reference. My truck is a 80 C-10, 4.1 .
http://67-72chevytrucks.com/vboard/s...d.php?t=607323 You might also try eBay using the part number.
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1980 C10 Custom Deluxe, 250 L6, 3 in the tree. |
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