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Old 08-10-2017, 01:55 PM   #1
3ac3
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Default 04 D2 Running hot under load

Hoping Dweb team can help provide some logical next steps to fix this issue. Planning a short trip to Baja during labor day weekend and hoping to get this problem rectified.

History and equipment:
2004 D2
Owned the truck since 2008.
Lifted with 33's, armor, winch, lights, etc
Never boiled over.
Only "overheated" once (recently). First time stock guage moved above center
Scanguage to monitor

About 4 months ago I replaced the fan/clutch, radiator (nissens), and T-stat (180* OEM). System was also flushed. Also stopped using Dex and now using Peak global lifetime. Why did I replace everything? The engine was running hotter than I wanted especially on long trips through the desert. Although it never got above 235* even at 100* outside and driving up a hill/mountain with AC on. And always cooled down. Normal temps were in the 198-208* for everyday driving.

Since I've replaced the parts the truck is running around 198 - 204 around town with AC on but when it's under load it consistently get's hot (freeway speeds, mountain, even some longer hills around town) and it will climb to 220* quickly and higher. But always cools back down and motor can idle and stat at 200*

A recent trip to Big Bear saw my first "over heating". Before climbing the mountain the engine got to 245* and stock gauge moved to 3/4. I quickly pulled over and let it cool down. It was 100* outside and AC was on. After letting it cool down I continued but with AC off then started to head up the mountain grade. It jumped to 240* and I pulled off again to let it cool. I removed the grill (a little more airflow) to try one last time and made it up the mountain going very slow. Wheeled that day and never got above 215*

What seems to be working:
Fan and clutch
Radiator (20* difference between in and out hoses). LR shop also placed cardboard to block airflow and engine temps climbed but as soon as the board is removed the motor cools down quickly.
T-stat (but maybe it's sticking?)
Block test was done by my LR shop and came back good.
System bled and I don't believe to have any air
New expansion tank cap
New waterpump (replaced 2 weeks ago)
Electric condensor fan is working
Temp sensor is new and IR therm confirmed working properly

What are the logical next steps?
LR shop wants to install a second electric fan, oil cooler, etc. But I feel like that isn't addressing the issue.
If the block test came back fine that should mean the head gaskets and any other more serious internal issues like cracked block or liner are good right?

I'm thinking of having the cats checked to make sure flow is good. Only code I get is P0327 (knock sensor) which I've had for a long time on and off.

What's next? Thanks for the help.
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Old 08-10-2017, 02:39 PM   #2
JohnB
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Default Re: 04 D2 Running hot under load

I'd check for intake leaks.
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Old 08-10-2017, 03:01 PM   #3
robertf
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Default Re: 04 D2 Running hot under load

Quote:
Only code I get is P0327 (knock sensor) which I've had for a long time on and off.
Fix this. Your ignition timing is retarding. That increases cylinder temperatures
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Old 08-10-2017, 06:26 PM   #4
squirt
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Default Re: 04 D2 Running hot under load

If you're hitting 220deg+ with any regularity, you're right that there's still something wonky. On the same grade up to Big Bear where you were topping 245deg, I never get higher than ~225 during the hottest summer days. That's with a similar setup truck, A/C on, fully loaded down with family/cargo/bikes/etc. Oh, and I'm running basically original 150k mile cooling setup with cheap-o walmart green coolant. Granted, I'm not trying to set any land speed records.

Before you replace that knock sensor, look at your timing maps. It's a good thought, but it may not be having any real impact.

If the temp drop across your radiator is consistently in the 20deg range, that's pretty good for an OE-style radiator. It tells me that your engine is probably just creating too much heat for the cooling system to overcome, which could have many causes. What do your long term fuel trims look like?
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Old 08-10-2017, 07:38 PM   #5
3ac3
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Default Re: 04 D2 Running hot under load

Quote:
Originally Posted by JohnB View Post
I'd check for intake leaks.
What type of intake leaks are you referring to?
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Old 08-10-2017, 09:29 PM   #6
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Default Re: 04 D2 Running hot under load

try a new/hd fan clutch

those temps are not right
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Old 08-11-2017, 12:46 AM   #7
3ac3
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Default Re: 04 D2 Running hot under load

Quote:
Originally Posted by squirt View Post
If you're hitting 220deg+ with any regularity, you're right that there's still something wonky. On the same grade up to Big Bear where you were topping 245deg, I never get higher than ~225 during the hottest summer days. That's with a similar setup truck, A/C on, fully loaded down with family/cargo/bikes/etc. Oh, and I'm running basically original 150k mile cooling setup with cheap-o walmart green coolant. Granted, I'm not trying to set any land speed records.

Before you replace that knock sensor, look at your timing maps. It's a good thought, but it may not be having any real impact.

If the temp drop across your radiator is consistently in the 20deg range, that's pretty good for an OE-style radiator. It tells me that your engine is probably just creating too much heat for the cooling system to overcome, which could have many causes. What do your long term fuel trims look like?
Thanks. Are you asking long term fuel mpg? I get around 11mpg but honestly never pay attention as I expect it to be bad.
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Old 08-11-2017, 12:47 AM   #8
3ac3
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Default Re: 04 D2 Running hot under load

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Originally Posted by crystalclear View Post
try a new/hd fan clutch

those temps are not right
Thought about that but likely not the issue since this happens on the freeway as well
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Old 08-11-2017, 11:34 AM   #9
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Default Re: 04 D2 Running hot under load

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Originally Posted by 3ac3 View Post
Thanks. Are you asking long term fuel mpg? I get around 11mpg but honestly never pay attention as I expect it to be bad.
Not mpg... You can look at long term fuel trim (LTFT) numbers from the ECU. (I use Torque app, may be able to use scangauge..never had one) High positive numbers means it's compensating for something by adding excess fuel. High negative numbers mean it's purpoaely holding back fuel for some reason to lean out the mix. Anywhere in the +/-3% range is pretty normal.
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Old 08-11-2017, 11:51 AM   #10
Dave03S
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Default Re: 04 D2 Running hot under load

I would open the bleed screw first thing in the morning, dead cold engine, and see first hand if there is an air bubble in there. top it off through the bleed hole if so.

Any air in the system should wind up behind the bleed screw thus an easy place to see and eliminate.
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Old 08-12-2017, 12:04 AM   #11
special ed
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Default Re: 04 D2 Running hot under load

Check your inlet and outlet temps from the heater core and see if it is blocked (air pocket trapped in there) will cause engine temps to be fine at normal driving and spike when on freeway under load.

Try bypassing the heater core and drive it!

Ran into this last year on a disco and it sent me spinning for a while till i found it.

Worst case bring it out and ill look at it for you.

Ed@IERovers.com
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Old 08-12-2017, 05:07 PM   #12
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Default Re: 04 D2 Running hot under load

Quote:
Originally Posted by 3ac3 View Post
What type of intake leaks are you referring to?
Any intake leak post Air Mass Meter can make your engine run lean and hot. Might try a smoke test.
Pull the engine fan off light a cigar and blow smoke around the intake area. If the smoke is drawn in than you have a leak. Injector seals are very common and if you have over 100K they usually need replacement.
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