Overheating when towing in overdrive

[Crazytown]

Engine getting hot when towing my 31’ travel trailer. Dealer did a ride along and concluded that the fan clutch was bad and there was a restriction in the oil cooler. Replaced both, still getting hot. I’m not losing coolant. The fan is not cutting on when the temp gauge goes up. I hooked up my Superchip Flashpaq to monitor actual engine temp. Engine gets up to 242 degrees and the “check gauge” light comes on but no fan. This only happens when I am towing and it shifts into overdrive. If I punch the accelerator to make it downshift and get some more revs, the temp backs off. A/C still blows cold. Trans temp is perfect. Does anyone have an idea where to look next?

[averageguy]

Dont tow in overdrive.

But you could have a problem with a relay not turning fans on.

[dannyboy950]

Do you still have your egr valve and is it plugged in? What year is your truck,mileage?
When the cooler was changed was the system flushed? That temp was it coolant temp or oil temp? What were the actual other temps?

On the ride-a-long did the dealer scan and do a data log and give you a copy?

[Crazytown]

2004 6.0 Powerstroke 160K miles

I was waiting for the "don't tow in overdrive". Prize goes to average guy.

I had the egr cooler replaced with one of those Bulletproof ones about 25K miles ago along with the oil cooler.

Yes, the tech did a data log and gave me a copy. Don't have it with me right now. I do remember that the oil temp was a lot higher than water temp.

The system was flushed. I'm not sure what temp I was reading. It was on my Flashpaq and said "engine temp".

[averageguy]

Sorry it had to be said. On second thought I dont think there is a relay for the fan clutch. Also id freak out if my temp jumped to 242°.

[Crazytown]

Originally Posted by averageguy

Sorry it had to be said. On second thought I dont think there is a relay for the fan clutch. Also id freak out if my temp jumped to 242°.

Yup, I left the door wide open for that.

I am freaking!

[dannyboy950]

One of the reasons for asking for more info is if the flush was done after the cooler was changed you may have plugged it up againn from stuff loosened from the flush especially if a chemical flush was used. Your radiator and heater core could also be restricted.

If your haveing high delta's again that is a good possibility.

There is considerable debate amoung the varieous forums whether to flush or not to flush. No real consensus yet.

[Crazytown]

Originally Posted by dannyboy950

One of the reasons for asking for more info is if the flush was done after the cooler was changed you may have plugged it up againn from stuff loosened from the flush especially if a chemical flush was used. Your radiator and heater core could also be restricted.

If your haveing high delta's again that is a good possibility.

There is considerable debate amoung the varieous forums whether to flush or not to flush. No real consensus yet.

Gotcha. I'm pretty sure it was flushed after the the oil cooler was replaced. Man, I hope it's not clogged up again. The shop that did it is in Florida and I am in Maryland. Is there an easy way to check the temps myself or should I just take it to the dealer?

[morganbryane]

Do you have a monitor to monitor vitals (EOT/ECT deltas, temps, boost, vgt, voltages)? Scangauge II is like $160. You can probably find one at Autozone. You should invest in one especially if you are towing. What color is your coolant? Is it still gold or is it turning a rust color?

[morganbryane]

I was in your position a few months ago taking a camping trip to Niagra Falls. Except you are in a slightly better positon. Right now, you are probalby looking at replacing just the oil cooler. I had a blow egr and oil cooler and head gaskets. I would take it to the dealer and have the oil cooler checked/replaced. Otherwise, you'll be replacing the egr cooler and maybe blow your head gaskets...

My 2 cents.