Overheating - JeepForum.com

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post #1 of 18 Old 06-30-2013, 12:41 PM Thread Starter
armada505
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Overheating

I have a small block chevy v8 in my jeep and on the trail it just wants to over heat. There is an aftermarket aluminum radiator there and a clutch fan. I was thinking of putting a pusher fan on the front but the trans cooler is there. anyone else have problems with overheating? any suggestions would be great

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post #2 of 18 Old 06-30-2013, 01:52 PM
LumpyGrits
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Not a fan of alum. rad. at all.
How long has it been in?
May need to pull it if a shop is will'n to do a pressure flush.
You run'n a shroud?
I have a 'pusher' fan just cause, it's nice to have.
LG
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post #3 of 18 Old 06-30-2013, 02:05 PM Thread Starter
armada505
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No fan shroud and I'm gonna try and change the thermostat and see if that helps. Any recommendations on fans?
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post #4 of 18 Old 06-30-2013, 02:06 PM
wblackm
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Make sure the clutch on the fan is not slipping.

Also, I have seen belts get a little lose and slip on the pulley attached to the fan clutch.
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post #5 of 18 Old 06-30-2013, 02:08 PM
wellmax
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after you have checked the cooling system and insure it's in near perfect condition
then you might try this material

Purple Ice – Radiator Coolant Additive


some add a secondary radiator with electric fan in the rear seat area to give the cooling system more coolant capacity.

guess that big engine just gives off more heat than the original engine
in that small engine bay.
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post #6 of 18 Old 06-30-2013, 02:10 PM
wblackm
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Also this may sound dumb, but check the orientation of the fan blades. Make sure it's pulling air into engine compartment instead of pushing it out.

I took this for granted on my jeep, but the po had the fan running the wrong direction.
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post #7 of 18 Old 06-30-2013, 02:14 PM
LumpyGrits
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Get a shroud
How far are the front of the fan blades from the rad? Should be no more than an 1 inch. 3/4" is even better.
If it's over heating, a different t'stat ain't gonna help(unless your's is bad)you at all.
LG
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post #8 of 18 Old 06-30-2013, 02:28 PM Thread Starter
armada505
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Is there a way to see if the tstat is bad or not? It kinda holds temp but after a decent trail ride it wants to jump up. I think the pusher in the front might solve my problem
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post #9 of 18 Old 06-30-2013, 02:33 PM Thread Starter
armada505
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Where would I even get a shroud that would fit?
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post #10 of 18 Old 06-30-2013, 02:40 PM
LumpyGrits
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Test the t'stat in hot water.
Google really is your friend.
You might have to have a sheet metal shop fab a shroud up.
Make sure your engine is NOT run'n lean fuel mix too.
LG
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post #11 of 18 Old 06-30-2013, 02:44 PM Thread Starter
armada505
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the jeep if anything is running rich
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post #12 of 18 Old 06-30-2013, 02:50 PM
82JeepCJ7
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Stay away from an electric fan band aid. Get a shroud, check the fan clutch (warm engine up, then shut off and see if you can spin the fan blades. There should be noticeable drag, if you can move them at all).

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #13 of 18 Old 07-07-2013, 11:50 AM Thread Starter
armada505
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okay have an update changed the thermostat to a 180 and still have the same problem just not as fast. what shroud are people using with the sbc v8 swap?
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post #14 of 18 Old 07-07-2013, 03:00 PM
LumpyGrits
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Until you do a 'rod-out' on the radiator, your wasting time and money.
BTW, I told you that change'n the t'stat would give you the results you just saw.
LG
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post #15 of 18 Old 07-07-2013, 06:16 PM Thread Starter
armada505
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now im not sure if this other problem affects this at all but the jeep idles high ~1300 rpms. either i can have a vacuum leak or the timing is off would this affect my overheating? Also the jeep is running very rich. here is my current set up this might help. I might just go with a combo unit from griffin radiator.
350 Small Chevrolet
Cam SpecsL-82 224/224 @ .050 .450/.460 114 LS
1977 Block 4 Bolt Main
Vortec Heads
Teraflex Aluminum V8 Radiator
2.5" 40 Series Flowmaster Muffler
Summit Racing Block Hugger Headers
Chevy Truck Serpentine Belt System
tbi fuel injection
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