Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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Yes it could be your cap. They are known to get weak over time. Even OEM caps are pretty cheap, or try an aftermarket.
Could be that your degas bottle is overfull. They will puke with too much coolant. Do you have the stcker showing the new min/max level? See the picture in the post above to set your proper level.
It could also be a blown EGR cooler. Do you have other symptoms? (lots of white smoke that smells like coolant?) You should get some gauges or an Insight to monitor your EOT and ECT differential. Once your oil cooler plugs up the EGR cooler is on the way to the same and cause head gasket problems. The root of the problem is the Ford gold coolant. May want to read on on this and consider what the best course of action is regarding flushing your system and switching to a CAT ELC coolant. Depending on where your oil coolers health is currently at, your course of action may vary. Need to read up and get familiar with the issue.
Could be headgaskets. Only sure way is to watch the pressure in the cooling system and/or buy the BlokChek kit to test for CO in the coolant.
Hope for the best, but act soon or you may regret it.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter