This is a car I have been going thu the last few months for my daughter. I noticed the last couple weeks that the coolant fluid level was down. I checked the oil dipstick and saw some brown froth residue on the end so I immediately thought blown head gasket, but not convinced. Added some more coolant to reservoir and it seems to be at same level. Engine runs fine. My daughter only drives short distances 5 or 6 miles one way to school so I am wondering if this is a condensation issue since I noticed this when it got cooler outside. Also noticed some brown residue inside the dip stick tube which could account for some as I pull the stick out. Haven't pressure tested the coolant system yet or performed compression test. I opened the reservoir tank a couple hours or so after the car was driven and it still had pressure in the system which is good news. The coolant itself is clean and clear, no oily residue. The ATF fluid is w/o the brown froth residue so I don't think the coolant is going there. Any thoughts? Want to continue improving the car but don't want to sink any more money if it is a head gasket. The car has over 200K miles. One other thing, the crank case breathing system has not been cleaned and is definitely clogged.