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The entire system pressurizes as the temperature increases, so the primary reason it wouldn't pressurize is if there were an outlet somewhere (read: a leak). This applies to the entire system as it all pressurizes at the same rate, being a closed-loop system, meaning that the entire system will have the same pressure; the radiator hoses won't be pressurized without the rest of the heater/turbo/etc hoses also having the same pressure. It doesn't sound like there is a noticeable leak, so it is possible there is air trapped in your system. The coolant system can be a pain to bleed on our cars, but I stick a piece of cardboard in front of the radiator while I'm bleeding so it can get nice and hot, then once the thermostat opens and I've added as much coolant as I can I kick on the heater to full blast. That pulls the coolant through the core and will generally bleed all the air out from there. Once you've filled the system and are satisfied you've added as much as you can after the thermostat is open, let the engine cool down and top up the coolant again once more. If you've done all that and it still won't pressurize, you have a leak somewhere. If your system is pressurized and holding, I'd start looking around the blower doors as one may have an issue with opening/closing, or the flow valve may be stuck. It's unlikely it would be attributed to anything with your TB/plenum bypass as that usually helps the system flow.
Cheers,
JBrobst "A life spent making mistakes is not only more honorable, but more
useful than a life spent doing nothing." George Bernard Shaw |
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