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Unread 04-06-2010, 01:12 AM   #1
owens261
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V8 conversion running to hot!

I have a V8 yj with a crate motor Chevy 350. I have trouble with it running hot just about 210. the A/C is not hooked up yet and when it is will definitely get hotter. I have a 4 coil aluminum radiator with an electric fan. I've changed the thermostat from none, to 180 now to 160. I have done everything I can think of to help it. Please help!!!!!


Last edited by owens261; 04-06-2010 at 04:09 AM..
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Unread 04-06-2010, 04:54 AM   #2
Mark05059
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sounds like it may have air in the system somewhere... Take the cap off the radiator and let it circulate... Fill as needed while squeezing the upper hose... be sure to watch the fingers!!
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Unread 04-06-2010, 05:32 AM   #3
1998zj
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What kind of fan setup do you have and how is the shroud?
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Unread 04-06-2010, 05:37 AM   #4
dodger889
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Do not run with a thermostat. Now if you install a 160* thermostat that would be better. Without a thermostat your coolant is circulating too fast not cooling like it should. You will get what are called hot spots in the engine where there is no cooling at all.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
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Unread 04-06-2010, 07:01 AM   #5
Louie4
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What kind of gauge are your using to read the temperature? Are you sure your fan is wired correctly? Did you flush the heater core and rest of the system prior to the V8 conversion? Does it run hot at highway speeds or when sitting still or all the time?
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Unread 04-06-2010, 10:20 AM   #6
owens261
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The fan is electric and is set to come on at 180 degrees and sits in it's own shroud. There is already a 160 thermostat in it. The temperature gauges are the Phantoms made by Auto Meter run through a sending unit (not electric). I can't say on the heater core being flushed prior to the conversion, bought it with the conversion done. The temperature was usually getting warmer while at highway speeds.......and maintains at around 200. I haven't taken it trail riding for a while but at one point it did it at a flat crawl but I think I've taken care of that.
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Unread 04-06-2010, 10:39 AM   #7
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Is the radiator new did you install it your self If not it may be stopped up see if you can get hold of a IR temp gun.
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Unread 04-06-2010, 10:57 AM   #8
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There is no problem with running at 210f. With a 4 core rad an electric fan and a 180f stat you should be just fine.
My rig runs @210f all day long as do most vehicles.

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Unread 04-06-2010, 11:53 AM   #9
owens261
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This engine was said that it's optimale running temp is 200f. Why doesn't the engine cool down so that the fan is not on constantly (basically not catching up)
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Unread 04-06-2010, 03:03 PM   #10
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Quote:
Originally Posted by owens261 View Post
The temperature was usually getting warmer while at highway speeds.......and maintains at around 200.
If it's getting hot driving down the road, it might have a restriction in flow. How does it do at idle and has this been a problem since you bought it?
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Unread 04-06-2010, 06:35 PM   #11
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how many miles are on the new engine? In my experience with new engines they will run a little how on the break in due to higher friction of the internal components. Might want to put some miles on it and see what happens.
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Unread 04-06-2010, 07:33 PM   #12
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i use to build drag cars before i got into 4x4s and we would have problems with them getting hot and did everything you mentioned and the best thing we found was a good electric water pump!!! that way it will spin at full speed circulating water reguardless of engine speed
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Unread 04-06-2010, 07:49 PM   #13
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guys he's 210 that's not hot. my 350 used to run perfect at 210. Gen III engines run that hot from the factory.
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Unread 04-07-2010, 02:26 AM   #14
owens261
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If 210 is ok why won't the engine catch up to cool down. While I was at idle the fan kicked on at 180 cooled then shut down. The fan again kicked on again at 180 and never shut off again, it never was able to cool down and let the fan take a rest and stop. Basically it's not catching up temp wise.
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Unread 04-07-2010, 03:43 AM   #15
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Ok do you know which 350 you have in there? Now what mods have been done? The 350 GM has been around since back in the late 60's to present. Fuel injection (tbi, mpi )or carbed you really need to say more than 350 there are a lot of other details needed to even start to give you more information on how to say if 210 is correct or not. Like what heads on what block. Now some of the new heads will bolt to an old block and not have the right coolant flow. The wrong head gaskets can cause the problem you are talking about. Compression ratios with the wrong fuel grade, tuning and so forth. What fan do you have in CFM's. You might not have enough air flow.

Oh what you are seeing about normal . Here is something to watch now if you take it for a drive then pull up to a stop and the temperature start to rise above the 210 and not cool back down fairly quickly to the 210 then you have a problem.Or slow running like in stop and go traffic and gets hot now you have a cooling problem.
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A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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