Continuing to obsess about staying cool... - Defender Source
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  #1  
Old August 8th, 2012, 11:26 PM
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Continuing to obsess about staying cool...

So after some hoses and reservoir changing, I *think* everything is fine but looking for ways to keep my engine running cool.

I've got a Scangauge and am reading that number. So when I run around town, stop and go, etc it stays about 186 in this summer heat... was below 180 when it was cooler out. Which is GREAT!

But when I am on the highway traveling 60mph+ and the get off and start into stop and go traffic... the temp starts to climb... as high as 205 right now. I've never allowed it to get higher than that.

Question is... if I add and/or recore my radiator, would that help bring the temp down after highway speeds or climbs?
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  #2  
Old August 9th, 2012, 12:53 AM
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Travis Graham
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I can't comment on the re-core, but IMO, one of the best ways to keep the engine temp down at idle is to install an eleven-blade fan and clutch from an RRC. It does a far superior job of cooling things down at idle over the wimpy D90 stock fan and it's a cheap mod!

Since doing that, my D90 can idle in 95-degree weather for quite a while (longer than I can tolerate the engine and exhaust noise, at least) with the air conditioning on and everything stays cool.

Travis
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Old August 9th, 2012, 07:45 AM
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Jason England
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I have the 11 blade fan with a rrc /disco 1 fan clutch ... Definitely seems better that standard.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old August 9th, 2012, 07:55 AM
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Is 205 really that hot for that engine? Running too cool is just as bad as running too hot. I would think 180-215 is fine. But I'm no expert on these v8s.
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Old August 9th, 2012, 09:10 AM
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Bill Adams
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Yah that's why the system is pressurized, so that it can run at temps over 210F. 205 is quite normal. Wouldn't worry unless you are losing coolant more than usual. Check under the water pump shaft for wetness.
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Old August 9th, 2012, 11:36 AM
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Fan clutch, water pump, radiator, AC fans --> all ok?
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Old August 9th, 2012, 12:00 PM
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Quote:
Originally Posted by aaronlam View Post
But when I am on the highway traveling 60mph+ and the get off and start into stop and go traffic... the temp starts to climb... as high as 205 right now.
Only two things besides the coolant hold thermal mass: The engine itself and the engine oil.

The temperature climbing after a highway run isn't from heat being generated by going slowly. It's most likely due to heat from the engine oil or engine itself being dissipated by the coolant. This is the way things are supposed to work.

In stop and go traffic, the cooling fan RPMs are much lower than they are on the highway. Therefore, less airflow over the radiator. Your coolant temperature gauge starts to rise.

Potential Solutions:
* Increase radiator airflow at idle. The only guaranteed way to do this is to supplement your clutch fan with an electric fan and independent temp sensor.
* Increase rate of heat transfer for a given airflow. This would be recoring the radiator or fitting a larger radiator.

Keep in mind that doubling the size of a radiator is difficult, expensive, or impossible. Doubling the airflow over the radiator is very easy.
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Old August 11th, 2012, 11:45 AM
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Yes... everything is working properly. Radiator might need a cleaning.

Thanks for the advice from everyone. I'll start with looking for an RRC fan... is that a straight replacement or a mod needed?
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Old August 11th, 2012, 01:24 PM
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RRC needs RRC fan clutch ... don't get a heavy duty one as it will constantly power the fan, make a hell of a noise and suck gas.

look for 11 blade fan
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #10  
Old August 11th, 2012, 02:25 PM
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Ray Gerber
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I can probably sort out an 11 blade Disco/RRC fan for you, hit my email ray.gerber(at)gmail.com
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