I drove to work today and when I got here, the radiator was steaming. I open the hood and I see that the driver's side of the radiator is soaked, the battery is soaked, and there is a large puddle at the bottom of the engine. Historically, I've had an issue with the coolant leaking, but only small amounts here and there. This doesn't smell like that and my coolant levels are full. The fluid is a yellowish tint, but I can't place my finger on the smell.

Any ideas?

 

I should also note that my heater took longer to produce warm air through the vents. My coworker said that's a tell-tale sign that I probably need a new thermostate and hose. When I turned on the air I got the 'check gauge' light and I could smell the fluid through the vents so I turned it off.

 

Most likely coolant.

 

update: the mechanic said the radiator was leaking, the thermostat was broken, and the water pump was really wobbly.