Average Engine running temp, '04 4.6 V8 - Defender Source
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  #1  
Old June 22nd, 2014, 08:42 PM
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Average Engine running temp, '04 4.6 V8

Hello All,
I'm trying to chase down a potential running hot problem and was wondering what you guys had for an average running temp on the Rover V8. 2004 4.6, usually between 200-215 with 221 as the peak on a very warm day in a hilly area. As soon as I reached the crest (and it shifted, it dropped back to ~208). I feel like this is on the high side of normal but wanted to see what the community thought.

Initially there was air in the system which I've since purged, next I'm putting in the lower temp thermostat (as recommended by a board member). But I wanted to make sure there's nothing I'm missing if I'm going to swap cars with my wife to drive the little ones around...

Any ideas?

Pics via Torque App and a bluetooth OBDII reader, so yes it relies on the factory sensor.
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  #2  
Old June 22nd, 2014, 08:49 PM
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How fast were you going?

Those temps are a little high. I'd think fan clutch.
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  #3  
Old June 22nd, 2014, 08:50 PM
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Is it holding pressure?
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  #4  
Old June 22nd, 2014, 09:12 PM
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25-30 in the hilly parts the other day. Definitely not highway speeds if that's what you were asking. Fan clutch could be suspect, but it does spin freely with a bit of resistance both directions when cold.

-

Yes it holds pressure, no leaks that I see.
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Old June 22nd, 2014, 09:17 PM
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Yep, that's what I wanted to know. I assume you were moving faster after you crested the hill?

My guess is that the clutch doesn't lock up enough after it gets warm, so at lower speeds you aren't moving enough air.
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  #6  
Old June 22nd, 2014, 09:19 PM
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A bit faster. I'd say just less load. It's worth noting this was with 5 people in the car. By myself it's a few measurable degrees less.

------ Follow up post added June 22nd, 2014 09:26 PM ------

In retrospect it definitely had a good amount of air in it which caused my initial concern. I'm just trying to lock it up after fixing that part of the issue.
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Old June 22nd, 2014, 09:30 PM
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definitely change the fan clutch. then see how it is. made a huge difference for me.
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Old June 22nd, 2014, 09:34 PM
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Have you flushed the radiator?

Have you done a pressure test ... Sometimes you only get to see a fine mist leak under pressure that's would evaporate before you see it when running.

If the fan locks up then chances are it's not the root cause ... You want to make sure everything is good before changing something that could mask the problem.

Do you know why you lost fluid in the first place?
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  #9  
Old June 22nd, 2014, 09:54 PM
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Haven't dug into it more than topping off the fluid and purging the air yet. I think there was air in the system since I've had it. There was a replacement motor put in about a month before I took ownership. I have a feeling that it wasn't purged correctly since install it just took this long for me to notice.
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Old June 22nd, 2014, 10:35 PM
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Quote:
Originally Posted by hillstrubl View Post
Haven't dug into it more than topping off the fluid and purging the air yet. I think there was air in the system since I've had it. There was a replacement motor put in about a month before I took ownership. I have a feeling that it wasn't purged correctly since install it just took this long for me to notice.
New or used motor?
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Old June 22nd, 2014, 10:44 PM
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Used, 70k or so.
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  #12  
Old June 23rd, 2014, 01:23 AM
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Those numbers look fine to me. I regularly monitor cars while driving during diagnostics. It's not unusual for these cars to run 225 on the highway. The lower temp thermostat will probably drop it a few degrees, but I wouldn't be unduly concerned.
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  #13  
Old June 23rd, 2014, 01:12 PM
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related question, I've heard BMW pink (DexCool) or flush and switch to green. What's the consensus?
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Old June 23rd, 2014, 01:29 PM
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I suggest green. Flush it thoroughly.
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  #15  
Old June 23rd, 2014, 01:45 PM
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Also fit the TD5 thermostat so it runs cooler. There is zero margin for error or spikes running at those temps.
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  #16  
Old June 24th, 2014, 09:55 AM
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Quote:
Originally Posted by evilfij View Post
Also fit the TD5 thermostat so it runs cooler. There is zero margin for error or spikes running at those temps.
New (180) t-stat came in today, fitting tomorrow.
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Old June 24th, 2014, 09:58 AM
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Quote:
Originally Posted by Roadsiderob View Post
Those numbers look fine to me. I regularly monitor cars while driving during diagnostics. It's not unusual for these cars to run 225 on the highway. The lower temp thermostat will probably drop it a few degrees, but I wouldn't be unduly concerned.
I had my ultra gauge in my acura tl and my lr3 and very rarely would either get to 200. Most of the time they stayed around 196. Never as high as 210.
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  #18  
Old June 26th, 2014, 06:44 PM
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Lower temp t-stat installed, coolant totally flushed out and replaced with green coolant (no gunk that was found). New equilibrium temp appears to be about 200. Highest I got it was 204 after a quick highway run. Immediately dropped once I let off the throttle.

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