A/C and heater vacuum lines? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70shortnphat · 06-28-2003, 11:01 PM

Does someone have a diagram of the vacuum connections for a 70 with factory A/C? I'm working on getting my A/C going and none of the vacuum lines are conected to anything. It was like this since I bought the truck. Im replacing the evaporater with one that has the oriface in the inlet. I got it out of an 87 Oldsmobile station wagon. It bolts right in to our trucks. Someone can have my old evap, expansion, manifold hose for free if they want it. dont know if any good or not.

70shortnphat · 06-28-2003, 11:03 PM

fits perfect.

70shortnphat · 06-29-2003, 04:29 PM

ttt

jef5150 · 06-30-2003, 12:46 AM

if you need some thing else ,let me know.I have the whole service manual for 1970

krue · 06-30-2003, 01:31 AM

I think he might be talking about the control vacuum lines.

cableguy0 · 06-30-2003, 11:51 AM

just some words of adivce go get a new accumulator and dont use that one you have laying there that accumulator is trash once they are exposed to open air they suck the moisture out of the air and become filled to capacity rendering them useless in an a/c system

70shortnphat · 06-30-2003, 06:23 PM

Thanks jef5150 but I need the vacuum control hoses locations.
Like on the back of the control head.

70shortnphat · 06-30-2003, 06:23 PM

and the heater control valve.

70shortnphat · 06-30-2003, 06:24 PM

and at the right kick panel.

70shortnphat · 06-30-2003, 06:25 PM

and the pasenger side cowl.

Wreck · 06-30-2003, 06:39 PM

#1 will go to the water valve

#2 goes to a "T" that one side goes to the vacuum reservior and the other goes to the pass door

#3 will go to the outside vent.

I know the pic is small but it helped me when did the vacuum lines.

Wreck · 06-30-2003, 06:41 PM

or if your switch only has two vacuum outlets..then use this diagram

70shortnphat · 06-30-2003, 06:41 PM

the top of the vacuumcontrol head moves. what atatches to it to move it?

Wreck · 06-30-2003, 06:46 PM

mine had the 3 vacuum outlet and nothing was atatched to the top of the control head, It is all controlled by the position of the levers frum underneath it...not sure about if on a 2 outlet control head.

70shortnphat · 06-30-2003, 06:52 PM

Mine has two and it looks like a cable should attatch to the top part and make it pivot. it turns very easily 360 degrees.

Wreck · 06-30-2003, 07:00 PM

Does that control head have anything connected underneath it?...not sure If I can help with that type, but after you figure it out, that vac diagram will help you the rest of the way.

70shortnphat · 06-30-2003, 07:10 PM

no nothing underneath. and nothing was connected on top either.
nothing connected at all since I bought the truck.

jef5150 · 06-30-2003, 07:24 PM

i have no idea how these are gonna turn out ,i had to compress them 5 times before i was aloud to send them!!!!

jef5150 · 06-30-2003, 07:28 PM

another 1

EdB · 06-30-2003, 08:23 PM

There is some good info in these posts and I
sure saved it.

Thanks,

EdB

70shortnphat · 06-30-2003, 09:29 PM

Thanks for all the help "jef5150" and "wreck."

06-30-2003, 12:46 AM	#4
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	is this what you want?????? if you need some thing else ,let me know.I have the whole service manual for 1970 Attached Images

06-30-2003, 01:31 AM	#5
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	I think he might be talking about the control vacuum lines. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

06-30-2003, 11:51 AM	#6
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	just some words of adivce go get a new accumulator and dont use that one you have laying there that accumulator is trash once they are exposed to open air they suck the moisture out of the air and become filled to capacity rendering them useless in an a/c system __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

06-30-2003, 06:23 PM	#7
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	Thanks jef5150 but I need the vacuum control hoses locations. Like on the back of the control head. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-30-2003, 06:23 PM	#8
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	and the heater control valve. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-28-2003, 11:01 PM	#1
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	A/C and heater vacuum lines? Does someone have a diagram of the vacuum connections for a 70 with factory A/C? I'm working on getting my A/C going and none of the vacuum lines are conected to anything. It was like this since I bought the truck. Im replacing the evaporater with one that has the oriface in the inlet. I got it out of an 87 Oldsmobile station wagon. It bolts right in to our trucks. Someone can have my old evap, expansion, manifold hose for free if they want it. dont know if any good or not. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-28-2003, 11:03 PM	#2
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	Hear is the evap going in fits perfect. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-29-2003, 04:29 PM	#3
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	ttt __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-30-2003, 06:24 PM	#9
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	and at the right kick panel. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-30-2003, 06:25 PM	#10
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	and the pasenger side cowl. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-30-2003, 06:39 PM	#11
Wreck Registered User Join Date: May 2003 Location: Paris, TX Posts: 60	#1 will go to the water valve #2 goes to a "T" that one side goes to the vacuum reservior and the other goes to the pass door #3 will go to the outside vent. I know the pic is small but it helped me when did the vacuum lines.

06-30-2003, 06:41 PM	#12
Wreck Registered User Join Date: May 2003 Location: Paris, TX Posts: 60	or if your switch only has two vacuum outlets..then use this diagram

06-30-2003, 06:46 PM	#14
Wreck Registered User Join Date: May 2003 Location: Paris, TX Posts: 60	mine had the 3 vacuum outlet and nothing was atatched to the top of the control head, It is all controlled by the position of the levers frum underneath it...not sure about if on a 2 outlet control head.

06-30-2003, 06:52 PM	#15
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	Mine has two and it looks like a cable should attatch to the top part and make it pivot. it turns very easily 360 degrees. Attached Images __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-30-2003, 07:00 PM	#16
Wreck Registered User Join Date: May 2003 Location: Paris, TX Posts: 60	Does that control head have anything connected underneath it?...not sure If I can help with that type, but after you figure it out, that vac diagram will help you the rest of the way.



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06-30-2003, 07:10 PM	#17
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	no nothing underneath. and nothing was connected on top either. nothing connected at all since I bought the truck. __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

06-30-2003, 07:24 PM	#18
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	hope these work ,,, i have no idea how these are gonna turn out ,i had to compress them 5 times before i was aloud to send them!!!! Attached Images

06-30-2003, 07:28 PM	#19
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	kinda fuzzy another 1 Attached Images

06-30-2003, 08:23 PM	#20
EdB Registered User Join Date: Jan 2003 Location: Gulfport Ms Posts: 401	There is some good info in these posts and I sure saved it. Thanks, EdB

06-30-2003, 09:29 PM	#21
70shortnphat "See the U.S.A....." Join Date: Apr 2002 Location: Richmond TX. Posts: 269	Thanks for all the help "jef5150" and "wreck." __________________ 1970 short bed fleetside 1949 all origional chevy 3600 1974 camaro Richmond , Texas(just S.W.of Houston)

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