Join Date: Feb 2011
Location: Edmonton, Alberta Canada
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If its plain water, yes. The cap allows the cooling system to build pressure and the higher the pressure the higher the boiling point of the coolant. So once you relieved the pressure on the cooling system you dropped the coolant boiling point and you saw it start to boil. If you had a 50/50, or what I use, 60/40 glycol mix the boiling point would be much higher and you shouldn't see boiling when you released the pressure.
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SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.