6.4 Coolant/Oil temps - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 07-27-2012, 05:11 PM Thread Starter
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6.4 Coolant/Oil temps

Today I was driving up a pretty steep long winding grade. I'm deleted and have an H&S on the mild tune. Anyways I got on it to merge into traffic and on my way up this grade I noticed my coolant temp began rise above the normal (192-198F) range. It was starting to get into the 210 range, then 215-220 range. my edge evo (gauges only) gave me an engine oil temp alarm at 230 degrees, shortly after this I hear the engine fan kick on hard, the coolant temp was about 220F and the oil temp was at about 230 the entire way up this hill. It was probably 90 degrees today. The minute I start going down the back side of this hill everything returned to normal.

Since then the coolant/oil temps have stayed right where they've always been 192-198F +/- 4 degree variance between both temps.

Could this be a bad oil cooler or just the fact that it was a steep grade and it was pretty warm today? Also had the A/C on full blast.

Any insight would be much appreciated!
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post #2 of 7 Old 07-27-2012, 06:23 PM
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Originally Posted by 04blackcrewcab View Post
Today I was driving up a pretty steep long winding grade. I'm deleted and have an H&S on the mild tune. Anyways I got on it to merge into traffic and on my way up this grade I noticed my coolant temp began rise above the normal (192-198F) range. It was starting to get into the 210 range, then 215-220 range. my edge evo (gauges only) gave me an engine oil temp alarm at 230 degrees, shortly after this I hear the engine fan kick on hard, the coolant temp was about 220F and the oil temp was at about 230 the entire way up this hill. It was probably 90 degrees today. The minute I start going down the back side of this hill everything returned to normal.

Since then the coolant/oil temps have stayed right where they've always been 192-198F +/- 4 degree variance between both temps.

Could this be a bad oil cooler or just the fact that it was a steep grade and it was pretty warm today? Also had the A/C on full blast.

Any insight would be much appreciated!
I would think if you had an oil cooler issue your temps would consistently be 12+ degrees apart. Towing my trailer I see 8 - 10 degree deltas. If everything came back down I wouldn't worry about it.

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post #3 of 7 Old 07-28-2012, 12:47 AM Thread Starter
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Thanks for the response. I guess I can't blame the truck if the oil cooler goes, i'm approaching 250k.
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post #4 of 7 Old 07-29-2012, 03:41 AM
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Ford has replaced my oil cooler twice all withen the last 7 months. Every time it goes out my coolant temps have been normal but the oil temp has gone over 225. They told me at ford since the blocks are casted in sand once it gets hot and the oil cooler goes because the sand blocks up the oil cooler and it will continue to happen. Which is what is happening with mine. I just got my truck back from them about 3 months ago put 2500 miles on it and it is bad again. I can drive around the city fine but as soon as i get on the highway the oil temps jump 20 degrees.

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post #5 of 7 Old 07-29-2012, 08:02 PM
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hey jp what is your coolant temp when your oil temp jumps that high? have you had the t stats replaced? how about a coolant flush?

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post #6 of 7 Old 07-30-2012, 01:25 AM
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Get a coolant filter also

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2006 F-350 Lariat, Supercab, 6.0L, 3.73's...Rhinolined Bed...6 Spd Handshaker...Mag-Hytec Diff. Covers...Smoked Recon Lights...Amsoil oils front 2 back...Optima Yellow Tops...MBRP 5" ST8 Pipe, Turbo Back...Dieselsite Coolant Filter...Amsoil/Injen CAI...SCT SF3 Canned Tunes 4 Now...CFM Intake Manifold and Boost Tube...Blue Spring Upgrade...Edge Insite CTS !!!
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post #7 of 7 Old 07-30-2012, 07:04 AM
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Originally Posted by pete37922 View Post
Get a coolant filter also

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Yup! Coolant filter should take care of the casting sand. I would do a coolant flush and add a coolant filter.

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