Join Date: Oct 2012
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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.