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#1 |
Registered User
Join Date: Jan 2009
Location: Oakwood, Ontario, Canada
Posts: 28
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'72 C20 rad overflow recovery tank
Just started to put this vehicle ('72 C20 Long Horn) on the road and noticed rad overflow, we are having a heat wave here right now.
Anyone know if there was a recovery tank available, and is it worth installing. Looks messy seeing it out flow onto the ground |
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#2 |
Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: '72 C20 rad overflow recovery tank
That's how they used to come man, overflowed right onto the ground and then you refilled the radiator as needed. I guess it kept the stray dog population down as a bonus.
![]() The Parts Forum has a member that sells a modern copy of the OEM optional overflow tank fairly often and various companies sell a version. Summit Jegs LMC....just about any vendor carries a version or several. Use the search feature, there are threads on the site about this. Here is a good thread on it, lots of pics for ideas. I have this task coming up by next March. http://67-72chevytrucks.com/vboard/s...d.php?t=476075 |
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#3 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,644
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Re: '72 C20 rad overflow recovery tank
Coolant recovery tank is a great thing IMHO. Be sure to use a radiator cap made for a closed (or sealed) system. Without that, coolant will not be sucked back into the radiator when the system cools down.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#4 |
Registered User
Join Date: Jan 2009
Location: Oakwood, Ontario, Canada
Posts: 28
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Re: '72 C20 rad overflow recovery tank
I have just replaced the rad cap as the seal didn't look that good and following that when parked it leaked out the overflow. Now on the same day we've had the temperature skyrocket so don't know if that caused the overflow or the new cap.
So the rad cap should hold pressure yet the overflow tank doesn't need to have a sealed cap as it would need to allow air into the recovery tank, least that's my thinking |
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#5 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,644
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Re: '72 C20 rad overflow recovery tank
Quote:
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__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#6 |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: '72 C20 rad overflow recovery tank
If you are filling the radiator to the top... don't. The level in original systems is supposed to 2 or 3 inches below the neck where the cap seals. Set it there then let it seek its own level.
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#7 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,644
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Re: '72 C20 rad overflow recovery tank
Quote:
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__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#8 | |
Senior Member
![]() Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,844
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Re: '72 C20 rad overflow recovery tank
Quote:
That doesn't mean its a bad idea to have a tank though. I'm curious how much more coolant is in the radiator when it's filled to the top with a tank in use. |
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#9 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,248
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Re: '72 C20 rad overflow recovery tank
Like HO455 said, lots of information on this. I can't speak for trucks with an Aux. battery, but I think they were recovery tanks placed on top of the RH inner fender.
Without an aux. battery, these expansion tanks were factory installed, though rare. They were also dealer installed. Seems they started adding tanks around 1971ish (i.e., California requirements), and they were mandatory in all states in 1973.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 09-26-2017 at 06:24 PM. |
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