I wouldn't worry about it. A "couple of spots" is nothing I would worry about.

 

Theres that B- word again

 

First thing you should always do is flush out the radiator real good with a hose. All the orange sediment tends to block the lower part of the radiator and make it waaay less effective. This is one more reason not to use straight water in a car, that sediment really messes with the radiator.
If you take off one of the lower coolant lines, you will be surprised at how much garbage with come out of it. There were giant globs of orange stuff that came out the first time I flushed mine. Same thing with my jeep. Most of the sediment in my father's f250 was built up in the tranny coolant lines. The entire lines were filled with it, and even more ran up into the rad itself. I would run the water in both the upper and lower lines until it ran clear in both directions.

 

you responded to a thread from 2007.

 

LOL I didnt realize, was searching and came across this.

 

Hey, I'm new to the forum. But I have an 05 f250 6.0L it's been fully bullet proofed and everything. I'm running a hypertech max energy programmer and every now and then when I get on the throttle I'll notice some white spots of coolant around the degas bottle cap and it is a stock cap. I'm trying to figure out what that may mean. I had the gaskets looked at and its all fine could I need a new cap? Cause it will only do that every blue moon.

 

It would be best to start a new thread with your issue!

This is an old dead thread!

 

I own a 2006 Ford F350 with the 6.0L. Coolant boils out of the res. constantly. I lose about a gallon a week or after 1 hour of highway driving. I have pressure tested the system and there are no leaks. The system will hold pressure for days without a drop in the gauge. I have replaced and tested the radiator cap and it is good. I suspected head gaskets but after a test with Matco's combustion gas tester, testing for exhaust gases in the cooling system, there are no signs of leaking head gaskets. I talked it over with some friends and I removed the water pump to check it for proper operation. all seemed normal. The transmission cooler inside the radiator is not leaking and I have no contamination or mixing of fluids.

I am getting to my wits end! I am a young mechanic but I still have several years under my belt. Am I missing something?

 

The combustion gas testers don't work, many have tried.

As much as I hate to do it, this is a good video of how to test.

 

Wow, talk about raising a thread from the crypt!

Good info Jack. No judgement here.

 

I figured I give the new guy a break, and the vid was less work.

Now, if he ever returns .......