Seriously, a $14 cap......or is it?

[elkarcher71]

I'll try to make this quick. I have an '04 F250 6.0 4x4 with A/T. Mods include AFE Proguard 7 OEM replacement filter, 4" turbo-back exhaust, and an Edge Juice with Attitude.

A couple of weeks ago, I started hearing a loud whistle (not the normal turbo spooling). It occured on acceleration, constant load, and after letting off the throttle. On Saturday I noticed 2 decent sized pools of coolant under my truck. I have never added a drop since the day I brought it home new, but I added just over a gallon. My commute to work is 30 miles of Interstate. Over the last 2 days I have been checking my level on arrival, and I have already dropped to the min mark from the max. My engine temps have not exceeded 180 (I live in Colorado where it hasn't been to warm lately). This morning, I saw steam coming from under the degas bottle cap. So I had an idea.....I traded my cap for one of our work truck's as a test for the night. The loud whistle is gone and not a drop of coolant under the hood tonight!

So my question is: Do you think the cap will solve my problems? Or is there a bigger problem that hasn't fully surfaced yet? Any thoughts/things to look for would be a great help. Thanks in advance.

[southern7.3]

Does it sound like a tea kettle whistle?

[dannanw]

.....stop by Centennial State Powerstrokes - Ford Powerstroke Diesel Forum and I sure hope it was only the cap.

[elkarcher71]

Originally Posted by southern7.3

Does it sound like a tea kettle whistle?

yeah, i guess that would be the best way to describe it. I'm not throwing any white smoke or experiencing loss of power either.

[Chango]

you might want to look into egr / oil cooler issues. There is alot of reading you can do here on the subject. Whats the mileage on the truck and do you still have the original coolant in it?

[elkarcher71]

Originally Posted by Chango

you might want to look into egr / oil cooler issues. There is alot of reading you can do here on the subject. Whats the mileage on the truck and do you still have the original coolant in it?

Mileage is 66,000. Coolant is original, but I test it every fall and it has always been good.

[Easy E]

My truck did the same thing (while towing though) and it had the original degass bottle cap. Ford has an updated version and haven't lost a drop of coolant since...