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Topic: expansion tank

in Forum: C3 Cooling and Heating Systems


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expansion tank (1/14)
 7/22/07 8:02am
engineguy63
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Easthampton, MA - USA

Vette(s):
1970 corvette conv, 350 auto.


Joined: 5/27/2007
Posts: 114

Hey guy's....wow, always more questions.  I have a 70 vert, with factory air, and there is no expansion tank...just a tube running down side of radiator. I guy at a show mentioned to me that he just stuck a plastic bottle down on the side were it wedges in and ran his tube into that so he does not see any anyoying dribbles, and the radiator pulls back in what it needs..........I just found a small amount of floid has come out the tube on mine, and I would like to use the same simple solution...do I need a special radiator cap or something, or do they all work the same ( my currant cap has a flip down lock lever) THANKS AGAIN!!
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expansion tank (2/14)
 7/22/07 8:47am
rick d
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williamston, NC - USA

Vette(s):
1969 coupe, 350, m22 trans, ac, black on black,


Joined: 1/19/2006
Posts: 353

 you need an expansion tank, the overflow lines feed from the bottom of the tank, you can buy one from eklers for a few bucks,rd
expansion tank (3/14)
 7/22/07 10:37pm
eddie20875Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c


Joined: 12/21/2006
Posts: 828

technically you can use any bottle just make sure the hose is at the bottom of the bottle. on my 75 the tube from rad connects to the top and inside tank hose goes to bottom and tank has about a quarter of it filled with antifreeze. it will suck in any antifreeze it needs and any that comes out when hot goes in the bottle.

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expansion tank (4/14)
 7/22/07 11:49pm
VNCRUISER
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North Hills, CA - USA

Vette(s):
1972 T-Top


Joined: 6/12/2003
Posts: 503

        Your car did not have an expansion tank because it has factory air. I was confused about that on my '72 for a long time. There is no room for it because the compressor takes up all the room. Later years had the smaller a/c  unit and a different style tank. Your car is correct the way it is....
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expansion tank (5/14)
 7/23/07 8:30am
eddie20875Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c


Joined: 12/21/2006
Posts: 828

a lot of cars before 73 did not have them but as rd said they made aftermarket kits to add them.  a/c unit size really didn't make a difference as my 75 has the larger unit on it. they mounted the tank on the rear of the right front wheel well. the tank is only about 6" high and about as long as the wheel well.

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expansion tank (6/14)
 7/23/07 11:33am
VETTERBOBLifetime Member
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DUNEDIN, FL - USA

Vette(s):
1969 COUPE CORTEZ SILVER, BRIGHT BLUE INTERIOR 383 cu. in. 512 HP. Hooker headers w/ side pipes PS PS AC AM FM STEREO. 68,000.MILES C5 5oth Anniversary Coupe , auto.350hp


Joined: 10/22/2004
Posts: 832

EDDIIE20875   I WOULD LIKE TO SEE THAT APPLICATION. DO YOU HAVE THE BIG BALONEY AC COMPRESSOR? AS i HAVE BEEN TRYING TO FIGURE A WAY TO MOUNT AN OVERFLOW TANK MYSELF.
expansion tank (7/14)
 7/24/07 6:46am
eddie20875Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c


Joined: 12/21/2006
Posts: 828

sorry didn't get a chance to answer. will see if i can get a pic later but you can go to ecklers and see the overflow tank. look under a 75.  i think it's about 20.00.

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expansion tank (8/14)
 7/24/07 3:40pm
VETTERBOBLifetime Member
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DUNEDIN, FL - USA

Vette(s):
1969 COUPE CORTEZ SILVER, BRIGHT BLUE INTERIOR 383 cu. in. 512 HP. Hooker headers w/ side pipes PS PS AC AM FM STEREO. 68,000.MILES C5 5oth Anniversary Coupe , auto.350hp


Joined: 10/22/2004
Posts: 832

WHENEVER YOU CAN. I WOULD REALLY LIKE TO SEE YOUR PLACEMENT OF THE TANK. THANKS
expansion tank (9/14)
 7/24/07 9:02pm
eddie20875Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c


Joined: 12/21/2006
Posts: 828

here is the pic of the tank on my 75. the a/c compressor is not installed but it is the larger style. the hose comes from the radiator along side and the only thing i have not installed yet is the hose that is the overflow from the tank. that one is just routed to under car. hope this helps.
 


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expansion tank (10/14)
 7/25/07 9:01pm
dwright
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Victor, NY - USA

Vette(s):
2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe


Joined: 7/12/2004
Posts: 6833

Now I need to go look at my '82 with factory AC to see what I have.

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expansion tank (11/14)
 7/30/07 10:41am
VETTERBOBLifetime Member
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DUNEDIN, FL - USA

Vette(s):
1969 COUPE CORTEZ SILVER, BRIGHT BLUE INTERIOR 383 cu. in. 512 HP. Hooker headers w/ side pipes PS PS AC AM FM STEREO. 68,000.MILES C5 5oth Anniversary Coupe , auto.350hp


Joined: 10/22/2004
Posts: 832

Thanks for the picture David, however, i don`t think I can get one the big to fit  in my `69.
expansion tank (12/14)
 7/30/07 9:31pm
eddie20875Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c


Joined: 12/21/2006
Posts: 828

would think they had the same cubby hole in the 69. try looking in pep boys, autozone, etc. as they do make generic tanks that are different sizes. maybe you can find one that will fit.

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expansion tank (13/14)
 8/7/07 8:21pm
VetteSpecialties
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Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe


Joined: 5/24/2007
Posts: 1031

Some 70's had an expansion tank in the system, mounted behind the right front tire.  That was different from the coolant recovery tank shown in the picture.  Most modern cars have a cooant recovery tank, so you should be able to find one that you can mount.  Be sure the pick up tube goes to the bottom of the tank.  Your car should only drizzle a little coolant if it is over-full, and then should never leak again.  Maybe you just need a new radiator cap.  
expansion tank (14/14)
 8/7/07 8:45pm
eddie20875Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c


Joined: 12/21/2006
Posts: 828

larry, the tank that is in the picture was used on 74-78 vettes. they changed the design a little bit for 78-82. also the tank in the pic is mounted on the back of the right front tire wheel well. that is a brand new replacement tank.
don't know what tank you have seen.


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