1983 CJ7 coolant overflow/recovery bottle - JeepForum.com
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Unread 08-02-2010, 08:13 PM   #1
cjkcj7
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1983 CJ7 coolant overflow/recovery bottle

I have a 1983 CJ7 with a 258.

I did a search on JF regarding the coolant overflow/recovery system. I understand that the radiator is pressurized, but the overflow/recovery bottle is not. Is this correct?

The reason that I ask is that I need a new cap for my overflow/recovery bottle. Should this cap be vented? From what I can tell, it shouldn't be, but I wanted to double check.

Thanks in advance for the help.

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Unread 08-02-2010, 08:44 PM   #2
143hc
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The spring in the cap keeps the rad pressurized. When the coolant gets hot it expands and pushes up the spring in the cap and runs out to the overflow, then is drawn back in when the coolant cools off and the spring returns to normal. So the rad is pressurized but the overflow isn't and doesn't need venting. But the tube has to run to the bottom of the overflow so air doesn't get sucked in.
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Unread 08-03-2010, 07:19 AM   #3
cjkcj7
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That's what I figured. Thanks.
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Unread 12-22-2014, 10:32 PM   #4
vsanzbajo
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The overflow bottle cap is really loose. It does not really close properly. It is extremely easy to open. It seems like it could just open alone. Is that normal?
Thanks
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Unread 12-23-2014, 05:35 AM   #5
Mike Romain
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Quote:
Originally Posted by vsanzbajo View Post
The overflow bottle cap is really loose. It does not really close properly. It is extremely easy to open. It seems like it could just open alone. Is that normal?
Thanks
Yes it is normal. The cap is just to keep dirt out.
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Unread 12-23-2014, 05:42 AM   #6
JoeyPlatinum
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Originally Posted by vsanzbajo View Post
The overflow bottle cap is really loose. It does not really close properly. It is extremely easy to open. It seems like it could just open alone. Is that normal?
Thanks
I would want at least a little bit of positive interference. That subtle snap.
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Unread 12-23-2014, 05:56 AM   #7
RedNeckCorvette
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I replaced the one on my F-250 with a metal juice cap over twenty five years ago and it is still going strong.
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Unread 12-23-2014, 06:24 AM   #8
Matt1981CJ7
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My '81 never came with an overflow tank and has never needed one.

I don't think how tight the cap fits matters at all.

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Unread 12-23-2014, 06:37 AM   #9
keith460
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A lot of CJ's did not come with the Overflow Tank which is included with the HD cooling system. Mine doesn't either and never needed it. But the Overflow tank has venting either via a hole or the cap or loose cap. When coolant is being pushed into the tank, air in the tank must be displaced or vented. When coolant is being sucked back into the radiator, air needs to be reintroduced back in the Overflow Tank by some means of venting. If it was air tight, coolant being pushed into the tank would try to expand the tank or collapse it when coolant is being pulled back to the radiator.
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Unread 12-23-2014, 09:34 AM   #10
CSP
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Mine didn't come with an overflow, but I added one after seeing coolant dripping out of the overflow tube on several occasions. Wheeling in Moab in June when it's 105 tends to push the cooling system a bit.
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Unread 12-23-2014, 09:44 AM   #11
j33pman
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I added a generic overflow tank to mine when I did my rebuild last year. I never had a factory one.
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Unread 12-23-2014, 12:01 PM   #12
RedNeckCorvette
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My 1979 has a, utility discharge gravity to ground based drainage system. Very technical.
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Unread Yesterday, 04:34 AM   #13
dg6772
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I didn't have one either, I used a washer fluid bottle. Been working fine for 2 years. I bolted it low on the fender in front of battery tray.

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Unread Yesterday, 07:03 AM   #14
RedNeckCorvette
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Originally Posted by dg6772 View Post
I didn't have one either, I used a washer fluid bottle. Been working fine for 2 years. I bolted it low on the fender in front of battery tray.

Dave in Muskegon using JeepForum app
looks like you have given me another thing to to consider. I will be on the look out for the right container. I know we have a several OEM wind shield wash containers around here some place. Just might be the ticket.
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Unread Yesterday, 07:07 AM   #15
ADDZ71
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The overflow bottle should not be mounted low. Preferably the two fluid levels should remain about even or higher for the overflow if possible (relative to the ground). When the cap opens you want flow to be in either direction but favoring the radiator.
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