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Old 04-12-2009, 07:26 PM   #1
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Optimizing Cooling System ?

Hello.

Yesterday I installed a new radiator. Now the temperature is always a bit below or at 210 degress at highway speeds from 50-80 mph (without the e-fan).

In the city at 0-40 mph the temperature is also at about 210 degrees. Sometimes the e-fan turns on when it gets to hot. The more traffic the more often the e-fan turns on. It turns on at 215 degrees and off at 205 degrees.

I live in a big city with very much traffic. And for me the e-fan noise is a bit annoying.
So what can I do to optimize the cooling system?

Thanks in advance.
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Old 04-12-2009, 07:32 PM   #2
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right around 210 is perfect for the 4.0. you want it to keep it at that temp BUT without the fan turning on as often? Do you still have the factory fan shroud and does your jeep still use the motor driven fan in addititon to the e-fan?

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Old 04-13-2009, 04:15 AM   #3
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I only have a Flex-A-Lite e-fan with a fan shrould.

How about a Robertshaw high flow thermostat? Is it worth the money?
Or a High Flow waterpump?
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Old 04-13-2009, 04:20 AM   #4
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So Nicolas, what are you really wanting? The fan to not kick on?

If so you might want to check this out. http://www.a1electric.com/Merchant2/...ode=FAN-PWM-V3 it gradually turns your fan on depending on the temp you set it for.
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Old 04-13-2009, 05:27 AM   #5
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My fan has an own thermostat. It turns on only when the cooling water is over 215 degrees. But in the city at slow speeds that happens too often IMO.
Thatīs why Iīm searching for a way to cool a bit better without the fan.

Is itīs a good idea to install a 180 degrees thermostat instead of the stock 195 F one?
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Old 04-13-2009, 10:51 AM   #6
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Is it a good idea to install a 180 degrees thermostat instead of the stock 195 F one?
No, never. The engine was designed to run at 210, the computer won't be happy at a lower temperature. Stick with the factory specified 195 degree thermostat.
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Old 04-13-2009, 11:11 AM   #7
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Another consideration- up to a point, engines run BETTER when warmer. Engines that are run too cool lose power, longevity, and economy. Again, the same goes for too hot, but just keep the engine in its OEM ranges (they did a wee bit of testing to get it right!), and you should be fine- 210 isn't very hot at all- Mark W.
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Old 04-13-2009, 11:54 AM   #8
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ya, your jeep is running just right, it and it sounds like your e fan is either on or off, and thats actually working properly the way you're set up. i like what jack suggested.
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Old 04-13-2009, 12:08 PM   #9
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From personal experience, if you have your Jeep running too cool (What I believe to be below 195, but could be mistaken) it actually throws an engine code and CEL for "Staying cold too long". My thermostat broke and got stuck open and with it running that cool all the time, the computer threw a fit.
On a side note, I have a buddy with an LS1 Camaro who wanted to optimize cooling past an electric water pump and new radiator so he swapped out the thermostat with the same temp. part, but he drilled two small holes on either side of it so that it would always be flowing just a little bit and it worked out great on his application. Might be worth asking around a little more on here. Because you want to keep it just a little bit cooler, not so cold that it throws a code on you.
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Old 04-13-2009, 12:27 PM   #10
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Ok thanks.

Perhaps Iīm a bit afraid. A buddy killed his VW some weeks ago because of too high temperature, only 215 degrees for about 1 hour.

Which temperature range is "safe" for a TJ?
Under normal conditions my TJ has 210-215 degrees. When I drive very fast (+80 mph) on the highway in the summer for a longer time it goes up to about 220 degrees and stays there.
Is that ok? Or too hot?

I know tht teh 4.0L runs hotter than other (European) engines. But I donīt want to damage it because of a too high temperature.
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Old 04-13-2009, 02:22 PM   #11
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that sounds fine. and i've never heard of a vw, or any vehicle getting toasted from running at 215.
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Old 04-13-2009, 03:18 PM   #12
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... i've never heard of a vw, or any vehicle getting toasted from running at 215.
Neither have I, not in 45 years of driving. 215 is nothing for an engine or engine oil.
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Old 04-13-2009, 03:54 PM   #13
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Nor I, in building racing engines for years. Also, almost all modern VW engines are aluminum block and heads- they WOULD be more susceptible to warping than an iron-block Jeep engine, BUT 215F is WAY too cold for that to happen. Also, what are you going by for readings? If anything, you SHOULD be running a bit cooler on the highway at 80ish- Mark W.
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Old 04-13-2009, 04:02 PM   #14
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My Engine runs at 212 F (100 C) at 120 kph (75 mph).
And at 220 F (105 C) at 145 kph (90 mph).
See pics below.
Is that too hot?

If itīs too hot, what can I do to improve the cooling system?



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Old 04-13-2009, 04:28 PM   #15
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Originally Posted by nicolas-eric View Post
My Engine runs at 212 F (100 C) at 120 kph (75 mph).
And at 220 F (105 C) at 145 kph (90 mph).
See pics below.
Is that too hot?
That is perfectly fine, don't worry about it so much.
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Old 04-13-2009, 04:40 PM   #16
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I'd bet the VW ran out of water, then the temp gauge didn't read the temp accurately.
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Old 04-13-2009, 05:26 PM   #17
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Quote:
Originally Posted by Jerry Bransford View Post
That is perfectly fine, don't worry about it so much.
Thanks Jerry.

The VW was a Golf MK1 with a small 1.6L engine that was tuned up to about 350 hp with a turbo and NOX for 1/4 mile races.
My buddie said that it was overheated. Normally it ran with about 180 F. The time the engine got dameged it was a bit +215 F.

Iīm not a mechanic, thatīs why I ask here. I donīt want to damage my TJīs engine...
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Old 04-13-2009, 05:28 PM   #18
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One more question.
The EU temperature gauge starts at 40 C (105 F). At the centre is 100 C (212 F). And at the right red side is 125 C (257 F).
Whatīs the white line between the centre and max? 110 C (230 F)? Or what else?
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Old 04-13-2009, 05:37 PM   #19
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One more question.
The EU temperature gauge starts at 40 C (105 F). At the centre is 100 C (212 F). And at the right red side is 125 C (257 F).
Whatīs the white line between the centre and max? 110 C (230 F)? Or what else?
112.5c is between 100c and 125c, that's what that center line indicates. Or for us Americans, 235 F.
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Old 04-13-2009, 05:38 PM   #20
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I'm totally guessing here, 234.5 deg F. Thats half way between 212 and 257.
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Old 04-13-2009, 06:08 PM   #21
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Ok Thanks.

One more Question:

Iīd like to intall a high flow Robertshaw Thermostat instead of the stock one. The guy at Quadratec.com told me that they donīt have such a thermostat for a 2006 TJ, only for TJsoo to 2002. Is that true?
Is there another high flow thermostat available for my 2006 TJ?
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Old 04-13-2009, 06:12 PM   #22
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Nicolas, I've seen that particular thermostat from Robertshaw and it opens no wider than the others I see for sale everywhere... that they call it "high flow" is just something the marketing department came up with.
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Old 04-13-2009, 06:19 PM   #23
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I like the gauge pic lol wish I could get my truck to that speed!
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Old 04-13-2009, 06:21 PM   #24
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Ok thanks again Jerry.

Now a last question:
Flowcooler.com says:

"Whether it is in stop and go traffic, a slow moving parade, in line at a car show, off road on the trails or hauling a heavy load up a grade all cars face diminished airflow through the radiator at slower speeds. FlowKooler hi flow water pumps push twice the coolant through the system at these lower speeds and help the engine transfer the heat. The result is engine temperature reductions of up to thirty degrees, increase system pressure in the engine block which reduces ping and improved flow efficiency which means more horsepower."

Is that true? A buddy told me that his temperature dropped about 10-15 degrees at slow speeds.
Is this waterpump worth the 100$ ?

Thanks!
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Old 04-13-2009, 06:32 PM   #25
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w/ that water pump you can have reduced heat in the winter, and can effect emissions and check engine light like we've already stated.

that temperature at 90 mph, might have something to do with cruising at 4500 rpm.
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Old 04-13-2009, 06:39 PM   #26
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^ I agree lol. I cruise at 65 if I am lucky
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Old 04-13-2009, 07:02 PM   #27
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That means I should get used to the annoying sound of the e-fan in stop and go traffic because the Flowkooler waterpump could cause some other problems?

But in the winter the e-fan also runs very often at slow speeds...

Yes I know that I sound crazy, but I like the sound of the 4.0L when I drive topless through the town. The sound of the e-fan is annoying IMO. Thatīs why Iīm searching for a way to cool the engine at slow speeds in stop and go traffic without the e-fan.
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Old 04-13-2009, 07:04 PM   #28
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Quote:
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^ I agree lol. I cruise at 65 if I am lucky
We donīt have a speed limit over here...
But youīre right. 90 mph is a bit too fst for a lifted TJ with 35s. Most of the time I drive at 70-75 mph.
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Old 04-13-2009, 08:32 PM   #29
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An oil cooler would probably help cool it more.
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Old 04-14-2009, 03:12 AM   #30
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I have an ATF cooler. But no engine oil cooler...

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