Degas Cap Leak - Ford Powerstroke Diesel Forum
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Old 08-07-2013, 09:03 PM Rookie

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Degas Cap Leak

05 F350, 105k, stock motor with a coolant filter. Oil cooler and EGR cooler replaced about 3k miles ago. Coolant filter kit installed at the same time.

Leaks slightly out of the cap and where the coolant filter hose comes into the degas bottle, leaving white residue. I have been running the coolant level slightly lower than the min mark. Not losing any significant coolant. The coolant is still completely clean. Replaced Degas bottle and Cap with aftermarket oem style. No white smoke, no hissing noises, and when the truck is warm if I release the pressure on the cap it doesn't "seem" overpressurized. I only smell it when I'm outside of the truck near the degas bottle. Doesn't matter if the truck is loaded or empty. EOT and EWT run within 5-10 degrees of each other while driving down the hwy.

I pressure checked the coolant system up to 16 psi and it checked out ok. I have not checked the cap, which will need to be done.

I took the truck to the dealer to diagnose a temperature delta and the EGR/Oil coolers were found but they also checked the head gaskets said it checked out ok. It wasn't under any factory warranty so they wouldn't be on the line for the cost of the repair. So I doubt they were trying to get out of charging me to do a head gasket job.

If they cap checks out ok any thoughts? Would seem unlikely to be the EGR/OIL cooler again after this minimal amount of miles, and seems like it would show other symptoms. Same if it were the head gaskets.

As of right now I'm just going to check the cap and probably keep driving it.
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Old 11-20-2013, 03:11 PM Rookie

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having the same problem did you every figure it out ?
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Old 11-20-2013, 03:28 PM
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the proper pressure test is with the cap on so it doesn't sound like the OP had his done correctly
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Old 11-21-2013, 01:08 PM Rookie

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same thing with Anti-freeze

Glad I'm not the only one chasing problems...

EGR delete, FiCM, oil cooler etc...but no evidence of an anti-freeze leak except I am losing it..mostly when towing (10,000lbs 200 miles = 1/2 gallon

been through 3 caps as "bad" and now mechanic is saying: compression perfect when cold and warmed up but after a 15 minute run up hills and a very quick check 8 is off about 5% but as soon as it cools even a few minutes it goes back to "perfect"..they say 8 has started "stretching the bolt(s)" and I need to do the gaskets and maybe heads, and bolts.

Questions: am I getting good thinking on the problem?

Would you drive it and just keep putting AFreeze in every 150 miles..or is that asking for a worse problem?

Thanks for the thoughts
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Old 11-25-2013, 02:41 PM
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try to get your fan clutch tested. a bad fan clutch will cause overheated coolant and or excessive pressure and ultimately lead to blown head gaskets. not saying for sure thats it, but just and option that might save you 5k for a head job.
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