Coolant Overflow Line/Reservoir - JeepForum.com
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post #1 of 34 Old 10-22-2021, 11:08 AM Thread Starter
jeffmcelwee
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Coolant Overflow Line/Reservoir

I finally got my 75 304 CJ5 finished and have started driving it more and more. After the longest ride get I noticed it was purging quite a bit of coolant, and tracing it down I realized the overflow line isn’t connected to a reservoir, it just sits between the grill and the radiator.

I’m assuming there’s supposed to be a reservoir somewhere, or if not is that hose supposed to be attached somewhere? I can’t imagine it’s supposed drain like that.

The only thing that did make me happy was knowing coolant is circulating! Trying to take some positive out of it.

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post #2 of 34 Old 10-22-2021, 11:12 AM Thread Starter
jeffmcelwee
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The heater code is bypassed, not sure if that info makes a difference in this case.
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post #3 of 34 Old 10-22-2021, 11:26 AM
LJameson
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AFAIK, my 76 did not come with a reservoir from the factory. At some point in its life, somebody added an aftermarket reservoir that mounted underneath the battery. But everything I read in the 76 Factory Service Manual for mine does not say anything about a reservoir, and the radiator just spews out when the radiator cap pops open.

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post #4 of 34 Old 10-22-2021, 11:35 AM Thread Starter
jeffmcelwee
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Awesome thanks for the info! I’m still relatively new to the CJ game so is this overflow something I should be concerned about? I’ll def be watching my coolant levels.

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Originally Posted by LJameson View Post
AFAIK, my 76 did not come with a reservoir from the factory. At some point in its life, somebody added an aftermarket reservoir that mounted underneath the battery. But everything I read in the 76 Factory Service Manual for mine does not say anything about a reservoir, and the radiator just spews out when the radiator cap pops open.
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post #5 of 34 Old 10-22-2021, 11:40 AM
Lockman75
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This is what I did to my ' 75 :
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post #6 of 34 Old 10-22-2021, 11:48 AM Thread Starter
jeffmcelwee
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Awesome! I was looking at overflow canisters on Quadratec, does that just bolt right on?
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This is what I did to my ' 75 :
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post #7 of 34 Old 10-22-2021, 01:06 PM
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post #8 of 34 Old 10-22-2021, 01:27 PM Thread Starter
jeffmcelwee
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Yes, yes I do.
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post #9 of 34 Old 10-22-2021, 02:09 PM
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Yes, yes I do.

They are made by a member here, Dadamsnv. A good product from a good guy.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #10 of 34 Old 10-23-2021, 04:54 AM
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Something no-one has mentioned, when you add an overflow bottle you also need the radiator cap from a year that came with a bottle. the cap that originally came with your jeep doesn't have the extra gasket that allows the coolant to be sucked back into the cooling system when it cools.
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post #11 of 34 Old 10-23-2021, 08:29 AM
bob4703
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Are you trying to keep the radiator cooling system level at full? It should be about an inch from the top of the tubes. If you let your Jeep find this level and leave it be you don't need a overflow bottle. It will burp until until it does.

Your 75 model isn't 1975 technology.

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post #12 of 34 Old 10-23-2021, 01:59 PM Thread Starter
jeffmcelwee
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I drove it around again this morning and it overflowed pretty significantly from the overflow hose...and it was in the 50's so it definitely shouldn't have gotten that hot. I'm thinking the thermostat is bad so I went ahead and ordered new hoses, t stat and housing, water pump and temp sensor. I was thinking maybe the guy before me overfilled it when he replaced the t stat but it feels like a faulty t stat to me. Went with a 180 degree so I'm hoping this at least helps the issue.
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post #13 of 34 Old 10-23-2021, 07:37 PM
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See post 2 in this link!

https://www.jeepforum.com/forum/f8/a...-leak-4429799/

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post #14 of 34 Old 10-23-2021, 08:44 PM Thread Starter
jeffmcelwee
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Post 2 is speaking my language! I was starting to be convinced I blew a head gasket (temp gauge isn’t working) but the coolant was filled to the tippy top of the radiator. Going to swap out the water pump and such because they’re all most likely original.
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See post 2 in this link!

https://www.jeepforum.com/forum/f8/an...-leak-4429799/

-----JEEPFELLER
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post #15 of 34 Old 10-24-2021, 07:16 AM Thread Starter
jeffmcelwee
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Update- after everyone’s help and some digging I saw that it’s a 14.5 quart system. I added water to bring it back to the level it had previously been to and it was exactly 1.5 quarts so the last owner almost certainly filled it with 4 gallons of coolant. I feel way better.
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