It located behind intake manifold, the intake manifold must be removed to get to valve, once you remove intake you will see pcv valve, dumb place for it i know,good luck.
SOURCE: Cant locate pcv valve on my 2005 mazda 3
Look under the intake manifold on the backside of the throttle body. If its turbocharged, you will have to pull the intercooler out to get to it.
SOURCE: 2004 Mazda MPV vacuum line from pcv valve and
You have the wrong type hose on the pcv valvle. It isn't vacuum hose.
Testimonial: "thank you you have been very helpful i understand now but the hose that is on the new pcv valve is a vacuum hose "
SOURCE: PCV VALVE
the pcv valve will be sticking out of the valve cover in either the front or back. and as for the dexcol, i would have it flushed really well and replaced with the reg green coolant. ive seen that stuff get bad quick.
SOURCE: location of 2006 mazda 3 airbag module.
look under the cup holders in the center console - should be simple to take out once you lift the emergency brake handle up.
The PCV valve (3) is mounted into the top/right side of the intake
manifold (2). 
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