Background info: Has around 183k miles, daily driven 80+ miles a day when I commute to work, never had an issue out of the car until recently, replaced thermostat after some questionable temps with 180Â° thermostat, and replaced upper radiator hose. I have a Bluetooth obd2 scanner that connects to my phone and I have it running any time the car is running because my speedo doesn't work and I monitor coolant temp, trans temp, battery voltage, etc constantly while driving. Coolant Temps hover between 180-220 normally, temp only gets high when sitting still like at a red light. Have seen it at 240 once and another time it skyrocketed (within 10 seconds or so) to 264 when the upper radiator hose blew. Replaced the thermostat after I saw it up at 240 and it hasn't gotten that high again. Fan is running any time I've checked about it. Had my car over a year now, always had a weird coolant disappearance going on. Every time I open the radiator it's low but not empty, if I fill up the overflow tank it's dry within days. Not exactly sure what's going on there unless the overflow has a slow leak in the bottom of it or if the system is sucking all of the fluid into the radiator as it gets low. I've never seen any coolant in the oil or oil in the coolant and never seen and smoke from the exhaust. Anyways, my worry began about three weeks ago. Coming to a red light, I notice coolant temp quickly rising. Wait 15 seconds or so for the light to change and I immediately pulled over at a gas station. Pulling in about to park, it gushed steam as the upper radiator hose spewed it's contents everywhere. Replaced the hose, filled back up with coolant and haven't had an issue since except for getting worried when the temp gets near 220. Have refilled the radiator about 5 times since then due to my dissappearing coolant issue. The other day my brother was at my house and I had my hood open and he pointed out a strange issue... I have coolant puddling up on the top of the motor. It's above where the thermostat is, more like under the front part of the intake manifold and I can see fresh coolant around one of the bolts on the inner side of the driver's side head. SO, after that long read if you even read it, I'm guessing I have a bad head gasket right? Is it a tough job to replace them? Looks like a pain in the ass from how much stuff will have to come off before the heads can be removed. Should I just replace the driver's side or is both recommended? Head gaskets a common failure?