Is this just bad coolant or something more serious like a blown head gasket?

I replaced it about 6 months ago, complete at-home flush. I used water hose water though, could this be it?

I don't seem to be losing any fluid.

 

flush and refill using distilled water. Tap water has minerals that will cause accelerated corosion. If brown staining in the reservoire is your only symptom than your good.

 

Yea, only thing that worries me is the brown/tan gunk stuck the the bottom of the radiator. You can see it in the 2nd picture...


Also...where do I get distilled water? lol Like from those 5 gallon refill places?

 

Honestly, it doesn't look bad.


Walmart, CVS, Target, almost any grocery store. Sells for about a buck per gallon. Cheap investment. Distilled, not spring/drinking.