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Unread 08-02-2010, 07:13 PM   #1
cjkcj7
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1983 CJ7 
 
Join Date: Feb 2009
Location: Northeast PA
Posts: 84
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, 07:44 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, 06:19 AM   #3
cjkcj7
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Location: Northeast PA
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That's what I figured. Thanks.
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