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New Radiator - overheating

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dluber View Drop Down
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    Posted: 18 June 2021 at 11:30am
Hello all,

  Long story short, my old radiator was damaged the last time I went to Raush Creek, PA so I swapped in a new Champion 3 core aluminum radiator as a replacement.  Prior to the new radiator, I was running max 180 degrees consistently.  With the new Champion, it's pushing to 220 very quickly and I think it would go higher if I didn't shut the engine down.  All new coolant and the coolant seems to be exchanging fine.  A few observations, this new radiator does not have a shroud and if I had to guess, it does not appear to hold as much coolant.  This is the first aluminum radiator I've used so I'm open to any suggestions. 

Champion Radiator CC5241.




Thanks,
Dave L.


Edited by dluber - 18 June 2021 at 11:56am
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Stev View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stev Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 12:01pm
Did you drill hole in the thermostat flange?  There could be air trapped in the head.  That would give you a 220 reading - if the coolant is not moving due to some sort of a air pocket.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote dluber Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 12:16pm
Stev,  yes, I have the 1/8" hole from the last time I replaced the thermostat. Thanks for the question.  I'm hoping it's an air pocket issue.  I'm going to give it a test again in a few minutes.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldmansimek Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 12:44pm
You need a shroud. It would appear you are 12 volts so the easiest way to accomplish that is buy a shroud with built in electric fans.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dluber Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 12:48pm
I am running 12v now, I will look into a shroud.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rocnroll Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 1:14pm
Did you 'burp' it?


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jeepinjase Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 2:51pm
I have the same radiator in my 2a.  I was having the same problem.  I went with an electric fan set up and it helped a little but didn’t take care of the whole problem.
A fan shroud made all the difference!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rick G Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 9:23pm
How many fins per inch is your new radiator?  Even though you have an extra row of tubes, you need the appropriate fins per inch (10-12) or you will run “hot”.  I had a brand new 3 row copper/brass radiator and it always ran hot due to a low fin count.  The fins (and to a degree, the type/size of the tubes) are how you dissipate the heat from the system.  This is very crucial regardless of radiator construction material.  Having a shroud is important also.  Close off the gaps between the radiator and the grill also.  You want all the air going thru the radiator and not out around it.

Edited by Rick G - 19 June 2021 at 10:00am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muley Quote  Post ReplyReply Direct Link To This Post Posted: 18 June 2021 at 9:32pm
Dave, that fan is pulling nothing thru the rad.. nothing. I put an alum rad in my 3A salad, its the exact size w/h as an orig. I pulled a shroud from a dead rad and used good ol'JB weld to "weld" it to the alum rad. 3 yrs later JB is still on the job, 160 deg tstat and I never see 180 on the gage. I've got fotos if you wanna see the rad/shroud setup..
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dluber Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2021 at 8:54pm
If you have some photos, that would be great.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2021 at 9:08pm
I have the same radiator in my jeep and when the jeep is moving it never gets above 185 with a 185 thermostat. I have my electric fans kick on at 190 and unless the jeep is stationary I never hear the fans come on.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muley Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2021 at 10:58pm
Originally posted by dluber dluber wrote:

If you have some photos, that would be great.
 
not much to see. the biggest challenge was the curve in the bottom tube (the stock rad bottom tube was straight) interfered w/shroud. Cut off the curved tube and tig'd on a straight one.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muley Quote  Post ReplyReply Direct Link To This Post Posted: 19 June 2021 at 11:03pm
the above pics are pre-JB while checking fitment-mockup. The duck tape and cardboard lends a nice touch don't you think?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dluber Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2021 at 5:48am
Thanks for the photos!  Looks like I will need to fabricate a shroud. 


Edited by dluber - 20 June 2021 at 6:00am
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