Thermal Vacuum Valve Hose Routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ratman90 · 08-03-2017, 03:09 PM

Hello, I looked but did not see anything in searches of forum. We recently pulled a 72 C10 2WD LWB out of a field. She runs good for 60k miles on the 307 2 BBL. Trying to replace hoses and vacuum lines. Trying to figure out what the thermal vacuum valve was that is on the thermostat housing.

Does anyone have a diagram of the correct routing on this? We are in Longmont, Colorado and it will be cold this winter and I want it to be able to warm up and idle correctly for my 16 YO son.

Using a picture that i found on here as reference.

She was last tagged and registered in 2006 and last ran in 2011 best we can tell. New battery, Gas tank, fuel pump and some tires that hold air, she is on the road again!

Larry

demian5 · 08-03-2017, 07:15 PM

Id just bypass for now. Unless you are keeping totally stock.

ratman90 · 08-03-2017, 08:00 PM

Keeping it totally stock for now. But just wanted to run well and be reliable. As it has been sitting forever I want to give it every chance.

geezer#99 · 08-03-2017, 08:36 PM

Burn us off some pics of your motor!

IIRC a '72 didn't have or need a thermal vac switch.

toolboxchev · 08-03-2017, 08:57 PM

Yea, Second that on the additional pics. To my knowledge the 307 did not have what looks like a more modern 305 thermostat housing.

Just my 2 cents.

08-03-2017, 03:09 PM	#1
ratman90 Registered User Join Date: Jul 2017 Location: Longmont, Colorado Posts: 64	Thermal Vacuum Valve Hose Routing Hello, I looked but did not see anything in searches of forum. We recently pulled a 72 C10 2WD LWB out of a field. She runs good for 60k miles on the 307 2 BBL. Trying to replace hoses and vacuum lines. Trying to figure out what the thermal vacuum valve was that is on the thermostat housing. Does anyone have a diagram of the correct routing on this? We are in Longmont, Colorado and it will be cold this winter and I want it to be able to warm up and idle correctly for my 16 YO son. Using a picture that i found on here as reference. She was last tagged and registered in 2006 and last ran in 2011 best we can tell. New battery, Gas tank, fuel pump and some tires that hold air, she is on the road again! Larry Attached Images __________________ 1972 C10 LWB 2WD 307 4 speed Rescued from Field July 2017

08-03-2017, 07:15 PM	#2
demian5 Registered User Join Date: Aug 2016 Location: Lake Forest, CA Posts: 2,177	Re: Thermal Vacuum Valve Hose Routing Id just bypass for now. Unless you are keeping totally stock. __________________ "Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC

08-03-2017, 08:00 PM	#3
ratman90 Registered User Join Date: Jul 2017 Location: Longmont, Colorado Posts: 64	Re: Thermal Vacuum Valve Hose Routing Keeping it totally stock for now. But just wanted to run well and be reliable. As it has been sitting forever I want to give it every chance. __________________ 1972 C10 LWB 2WD 307 4 speed Rescued from Field July 2017

08-03-2017, 08:36 PM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,512	Re: Thermal Vacuum Valve Hose Routing Burn us off some pics of your motor! IIRC a '72 didn't have or need a thermal vac switch.

08-03-2017, 08:57 PM	#5
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Thermal Vacuum Valve Hose Routing Yea, Second that on the additional pics. To my knowledge the 307 did not have what looks like a more modern 305 thermostat housing. Just my 2 cents.



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