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Message: [QUOTE="bismic, post: 1456240, member: 1537"] The cap is a relief valve. Relief valves all tend to weaken over time and then begin to vent at an early state. Some caps last longer (stay in calibration longer) than others. Ford states to replace the cap if it ever relieves. Also, the degas bottles are plastic and they can warp with time (and heat). This can cause the cap sealing surface to not be flat. You need to put a pressure gauge on the system (tee a gauge into the radiator vent hose). That said though, if there is no pressure on the degas bottle after getting up to temperature, then you absolutely have a leak in the system ....somewhere. A sealed system will pressurize when heated. Condemning head gaskets MAY be premature. Your lack of power is another issue that needs to be addressed. You should not have problems towing. Don't wait long on deciding what to do with the oil cooler either. If in fact it is plugging, changing it before it leaks is MUCH simpler. Lastly 35 psi of boost is crazy without head studs IMO. From this I would assume you are tuned. Hopefully you don't tow with it when tuned unless you have a tow tune. Maybe it is head gaskets if you tow w/ high boost. [/QUOTE]

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