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02-13-2025, 10:45 PM
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#1 |
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Active Member
 
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 172
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Does the coolant overflow need to be a closed system
Or can it just flow and suck from a bottle? My current tank by the battery broke and it was old and just the hose stuck into the tank and the lid was loose or non-existent. I am probably going to order the washer tank to replace it but I am wanting to know if I can mount a bottle somewhere as a get me by.
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'72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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02-13-2025, 11:08 PM
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#2 |
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Registered User
Join Date: Jan 2018
Location: Anacortes. WA
Posts: 145
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Re: Does the coolant overflow need to be a closed system
The coolant recovery system is a simple bottle for expansion collection when hot. As the engine cools coolant is sucked back into the radiator. A temporary plastic bottle can be used until you replace the OEM bottle. The hose from the radiator needs to extend close to the bottom of the collection bottle.
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02-13-2025, 11:22 PM
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#3 |
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Active Member
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 172
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Re: Does the coolant overflow need to be a closed system
I just re-purposed my washer fluid container as my wipers aren't working right now anyway. I re-mounted it on the passenger side fender and it already has a cap with a nipple and suction tube in it. I have seen older trucks with a Jack Daniels bottle and cork.
__________________
'72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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02-13-2025, 11:30 PM
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#4 |
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Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,939
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Re: Does the coolant overflow need to be a closed system
The lid or cork is not sealed. It is vented.
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Yesterday, 04:01 AM
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#5 |
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Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,930
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Re: Does the coolant overflow need to be a closed system
Coolant recovery tank should be open to atmosphere. Not present on stock 67-72 trucks, but feel free to add one. I will have one in my truck.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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Yesterday, 09:18 AM
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#6 |
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Senior Member
Join Date: Oct 2015
Location: Williamston, Mi
Posts: 888
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Re: Does the coolant overflow need to be a closed system
On my truck I bought a tank from amazon, mounted it on the firewall, it's not original, but it works fine, easy to see and out of the way.
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Yesterday, 09:36 AM
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#7 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,776
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Re: Does the coolant overflow need to be a closed system
You probably already know that you'll need a radiator cap for a closed system. A conventional cap won't suck the coolant from the overflow tank as it cools.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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Yesterday, 11:10 AM
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#8 |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,217
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Re: Does the coolant overflow need to be a closed system
I bought a tank from a member here it works great.
pictures here https://67-72chevytrucks.com/vboard/...d.php?t=855434
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1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer ............. 
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Yesterday, 12:44 PM
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#9 | |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,815
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Re: Does the coolant overflow need to be a closed system
Quote:
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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Yesterday, 02:52 PM
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#10 | |
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Senior Member
Join Date: Nov 2013
Location: East Tennessee
Posts: 2,217
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Re: Does the coolant overflow need to be a closed system
Quote:
here's a full shot
__________________
1967 C10 Step side 1968 C10 Step side 1970 Chevrolet K/5 Blazer 1972 Chevrolet K/5 Blazer .............
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Yesterday, 03:07 PM
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#11 |
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Active Member
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 172
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Re: Does the coolant overflow need to be a closed system
I have the AC in mine so I am limited where I can mount a tank. I posted earlier that I just robbed the wiper tank off the driver's side and put it on the fender by the battery.
__________________
'72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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