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The only thing that should cause the TCO to open is heat. There's some wax/plastic inside which keeps some spring-loaded metal bits in contact with each other. If the wax melts, then the metal bits lose contact. I don't think it provides any over current protection, it's thermal only. Of course...

I've just repaired both of my motor controllers with new TCOs (Panasonic EYP2BN134 ) purchased online for just a few pennies each. I snapped a photo with the covers off to show the difference between my original controller and the one purchased at the dealer. The one on the left is the...

I hadn't diagnosed the fuse problem with my MOSFET box before ordering a new "resistor" from the Mazda dealer. I placed that order, and then ripped the old box apart, learned about the fuse, etc... Well, the new box came in and I popped it into place without installing it into the duct, and it...

My 2009 Mazda 5 "sport" stopped blowing air through the front blower the other day. I did a bunch of research, want to share what I learned here because I didn't find the answers so easily in other places. My car has automatic climate control (9 or 10 blower speeds with an LCD display), and...