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Unread 01-17-2010, 05:12 PM   #1
Boosted98gsx
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285 Coolant direction

Which way does the coolant flow in these engines? top to bottom on the radiator, or bottom to top? Need to know which way the thermostat needs to be installed. Just did a head job on a 285 and it overheated on the first startup. Trying to eliminate variables here.

Thanks

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Unread 01-17-2010, 05:54 PM   #2
wrongway92407
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The little point faces outward. in at the top out at the bottom
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86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
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Unread 01-17-2010, 06:05 PM   #3
Boosted98gsx
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So just to be redundant, coolant comes into the radiator at the top, and exits the radiator at the bottom?
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Unread 01-17-2010, 06:10 PM   #4
VACJ7
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You said basically the sames thing as Wrongway. It flows out of the engine through the thermostat and into the radiator at the top. Out of the rad at the bottom and into the engine.
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Unread 01-17-2010, 06:12 PM   #5
Boosted98gsx
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Okay thank you, I just wanted to make sure that it was how it should be via thermal engineering. Still need to figure out why it's overheating. I guess it's time for a compression check :-\
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Unread 01-17-2010, 11:10 PM   #6
wrongway92407
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Ever notice that lower radiator hoses are usually heavier and thicker and some have a spring inside, that's so they won't collapse from the suction of the w/p
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Wrongway
My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
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Unread 01-18-2010, 06:24 AM   #7
Mike Romain
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Quote:
Originally Posted by Boosted98gsx View Post
Okay thank you, I just wanted to make sure that it was how it should be via thermal engineering. Still need to figure out why it's overheating. I guess it's time for a compression check :-\
The heads can be difficult to get all the air out of sometimes.
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Unread 01-18-2010, 09:13 AM   #8
mtbtweety
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only a few vehicles flow bottom to top (90s Camaros and maybe Vettes?). Most flow top to bottom to take advantage of gravity in the radiator.
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Unread 01-18-2010, 09:54 AM   #9
wrongway92407
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After reading mikes post, I went back to the beginning and you didn't say that you had a over heating problem. That's a different story. we need specifics. Did this happen all at once, did you change something and this is a result, is it really hot, or does the gauge say it's hot!
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Wrongway
My fleet:
86 CJ7 5.7 vortec. 4L60,D44's,OBA,Air tank bumpers w/D rings detroits,4.88,35" bfg, mt's 9500ti warn
86 CJ7 2.5 detroits, OBA 4.56, air tank bumpers, w/D rings,9500I warn 31x10.5x15, Trxus
86 CJ7 bone stock, w/factory 44 never seen the dirt soon to be for sale
87 Wrangler also never seen the dirt.
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