Can I remove the vacuum switches? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

andresco50 · 04-14-2008, 08:35 AM

My 2 vacuum switches I want to take them off !

andresco50 · 04-14-2008, 08:40 AM

I want to remove em 1 in the intake manifold and 1 in the water outlet

Mickey_D · 04-14-2008, 03:29 PM

Are you talking about the thermal valves? One is orange and one is a pale green?

The help correctly control the EGR valve, your torque converter lockup (if it has it), the air valve on the air cleaner horn, and sometimes vacuum secondaries on the carb. They also control the Air Injective Reaction System (better known as the smog pump, but your being a 1975 might not have it).

If you can live without all of the above, you most certainly can remove them.

LONGHAIR · 04-14-2008, 04:47 PM

On a '75, one of them might go to the vacuum advance cannister on the distributor. Back then they were "experimenting" with switching between ported and full manifold vacuum, with a thermally controlled switch.

andresco50 · 04-20-2008, 08:02 AM

Maybe im wrong here's a pic of that temp sensors

04-14-2008, 08:35 AM	#1
andresco50 Registered User Join Date: Jan 2008 Location: Lakeworth, Fl Posts: 633	Can I remove the vacuum switches? My 2 vacuum switches I want to take them off ! __________________ 2001 silverado 2wd 2003 silverado 4wd 1975 scottsdale c10 (project)

04-14-2008, 08:40 AM	#2
andresco50 Registered User Join Date: Jan 2008 Location: Lakeworth, Fl Posts: 633	Re: Can I remove the vacuum switches? I want to remove em 1 in the intake manifold and 1 in the water outlet __________________ 2001 silverado 2wd 2003 silverado 4wd 1975 scottsdale c10 (project)

04-14-2008, 03:29 PM	#3
Mickey_D Dirteh Kitteh Join Date: Nov 2006 Location: Mormon country Posts: 2,484	Re: Can I remove the vacuum switches? Are you talking about the thermal valves? One is orange and one is a pale green? The help correctly control the EGR valve, your torque converter lockup (if it has it), the air valve on the air cleaner horn, and sometimes vacuum secondaries on the carb. They also control the Air Injective Reaction System (better known as the smog pump, but your being a 1975 might not have it). If you can live without all of the above, you most certainly can remove them. __________________ Darrin 1955 Willys CJ-5 all original and the oldest CJ-5 on the road. 2001 Dodge Neon (wife's car) 1995 Jeep Grand Cherokee Limited Edition SOLD 1981 K15 Custom Deluxe 4X4, rusty but trusty wood hauler. SOLD 1993 S-10 4X4 Tahoe SOLD Sign up with the Contact List RIP ESLL

04-14-2008, 04:47 PM	#4
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	Re: Can I remove the vacuum switches? On a '75, one of them might go to the vacuum advance cannister on the distributor. Back then they were "experimenting" with switching between ported and full manifold vacuum, with a thermally controlled switch.

04-20-2008, 08:02 AM	#5
andresco50 Registered User Join Date: Jan 2008 Location: Lakeworth, Fl Posts: 633	Re: Can I remove the vacuum switches? Maybe im wrong here's a pic of that temp sensors Attached Images __________________ 2001 silverado 2wd 2003 silverado 4wd 1975 scottsdale c10 (project)



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