orange/brown gunk in cooling system

[Ameer Antar]

Just a little update on the brown coolant problem I had: So far so good, but
it's only been a few weeks. The coolant is a little darker, but still blue. In
the mean time I found a combustion leak detector online that's supposed to
detect combustion gases in coolant from a leaky head gasket or cracked block or
head. I got it here: http://www.sjdiscounttools.com/ttibt-500.html
 
The good news is the test fluid didn't change color at all, so no combustion
leak. But I noticed the coolant level is dropping. While I was under the car
checking the AT fluid leak, I noticed blue coolant on the a/c compressor hose,
so it could be a leaky hose or something. The problem with coolant is it
doesn't really leave trail for that long, so it's hard to tell where it's
coming from. If anyone has any advice on tracking a coolant leak I'd much
appreciate it.
 
-Ameer