This is nuts.
I've been having an issue with a P0302 (cylinder 2 misfire) and been trying to track the source for weeks. I started by replacing the spark plugs, that didn't fix it, so the replaced the ignition coil for #2, that worked for a couple days then the CEL came back on with same code. Finally paid attention to the coolant tank which there was only a SMALL amount of coolant in the tank.
Refilled it at the OReileys, checked the tank at my next stop and guess what, only a SMALL amount of coolant was in the reservoir... WTF?? I saw NO noticeable leaks anywhere...
Engine has NOT been running hot, always normal temperature...
Funny enough my heater stopped working a couple days ago... It worked after filling the coolant reservoir... I haven't been able to check the heat again after I saw the tank was low again...
WHAT IS GOING ON!?!?! I have a service appointment for Friday so guess I'll expect to shell out some $$$... ugh.