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Old 09-13-2011, 05:36 PM
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Another oil cooler thread

Well, Bulletproof EGR cooler and new oil cooler and still seeing high oil temps. No idea what the hell is wrong. So I just decided to bring the truck home. It can sit here just as well as it can sit at the shop.

Okay, so I picked up the truck from the shop yesterday. Got 15 miles down the road, truck got hungry and ate the belt. Thought it might have been a bent or broken pulley or just a old belt (6 years, 85k miles.) Turns out the water pump pulley was loose. Hmmmm...call the mechanic, he says bring it in he'll put on a new belt. Done and done. $40 later I bring the truck home a second time.

It's about 95* outside 10 miles in, ECT 199-203 EOT 221 and climbing. Drive another 8 miles ECT 204 EOT 241.2* !!!!

Park in front of the house and let the truck idle. So here is a question, when the coolant flows back into the degas bottle, at idle is it a constant stream or is it like this?


Another oddity. I let the truck idle for about 10 minutes ECT dropped to 192* EOT dropped to 129.2*. I decided I'll just back it in the drive way and park it for the night. Figure it out tomorrow. The minute I hit the incline of the drive way EOT plummets to 217*.

WHAT THE HELL MAN?

Last edited by Fantom; 09-13-2011 at 05:56 PM. Reason: my fat fingers hit the wrong number
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Old 09-13-2011, 05:43 PM
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Are you saying one-hundred degree temps
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Old 09-13-2011, 05:45 PM
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In relation to?
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Old 09-13-2011, 05:48 PM
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Could possibly have been a large pocket of air in the cooling system, is the system low?
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Old 09-13-2011, 05:48 PM
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Looks like head gasket replacement may be in your future...
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Old 09-13-2011, 05:52 PM
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I hope one of the Ford techs will chime in on this but that oil temp doesn't look real. Watching mine on my Insight from a stone cold start up it takes a while for the oil temp to match the coolant temp but from that point on it never drops more than a few degrees below the coolant temp and is usually 4-7 degrees above the coolant temp. With no load on the engine the coolant is heating the oil so it can't be 117*. Sounds to me like an oil temp sender is in order to start with...and a careful check of the wiring. Make sure one on the intake bolts with the studded end isn't chaffing the harness.
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Old 09-13-2011, 05:53 PM
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Quote:
Originally Posted by codyrock87 View Post
Could possibly have been a large pocket of air in the cooling system, is the system low?
This is what I was told by another diesel shop, and that I just need to drive the truck and let it work out the air.

Quote:
Originally Posted by NYC F-350 View Post
Looks like head gasket replacement may be in your future...
So far I've driven the truck about 40 miles, and really gotten on it from time to time. No puking at all, no pressure buildup and coolant seems to be exactly where it was when it was filled.

How would a headgasket cause the oil temps to be so high? (Legitimate question, not trying to doubt you)

Quote:
Originally Posted by sargar View Post
I hope one of the Ford techs will chime in on this but that oil temp doesn't look real. Watching mine on my Insight from a stone cold start up it takes a while for the oil temp to match the coolant temp but from that point on it never drops more than a few degrees below the coolant temp and is usually 4-7 degrees above the coolant temp. With no load on the engine the coolant is heating the oil so it can't be 117*. Sounds to me like an oil temp sender is in order to start with...and a careful check of the wiring. Make sure one on the intake bolts with the studded end isn't chaffing the harness.
HAHA, you are correct sir. I meant 217*, my fat finger hit the 1 instead of the 2

Last edited by Fantom; 09-13-2011 at 05:57 PM.
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Old 09-13-2011, 05:55 PM
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I made the comment based upon watching your video of the gas bubbles in the degas bottle at idle.
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Old 09-13-2011, 06:16 PM
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That flow back into the degas bottle is a little more.... violent than I've seen. Mine looks like a good flow, but nothing explosive usually. Keep in mind that that side hose going back to the degas bottle is directly from the EGR cooler. If coolant was boiling in the EGR cooler, I'd guess that it would be quite violent on the return.

The bulletproof cooler won't prevent boiling of coolant if it sees constant hot exhaust and low coolant flow, it just won't pop and leak all into your intake generally.

Sounds like you could possibly have 'replacement oil cooler got re-gunked-up' syndrome, which really sucks
Either that, or yea... HG's... Personally I'd hope for the cooler myself.

Last edited by Dicion; 09-13-2011 at 06:21 PM.
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Old 09-13-2011, 06:18 PM
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Quote:
Originally Posted by NYC F-350 View Post
I made the comment based upon watching your video of the gas bubbles in the degas bottle at idle.
Ahhh, gotcha. I wonder if maybe there is just an air pocket in the cooling system? Or maybe a blockage in the oil side of the new oil cooler?


Quote:
Originally Posted by Dicion View Post
That flow back into the degas bottle is a little more.... violent than I've seen. Mine looks like a good flow, but nothing explosive usually. Keep in mind that that side hose going back to the degas bottle is directly from the EGR cooler. If coolant was boiling in the EGR cooler, I'd guess that it would be quite violent on the return.
I've noticed that at 1500 rpm, it's just a normal flow.
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