The 97 Accord Wagon 4-cyl. overheated Friday. I noticed the radiator coolant level was low; it took about 2 liters of water. Then it ran fine, temperature steady. However, I’m concerned about where the coolant went—though I must say, this is a very light-duty car and I haven’t checked it in probably a year or more.
I see no signs of leaks, both with engine running and stopped. The worry, of course, is an internal (head gasket) problem, but no signs of that either, so far. The heater works fine.
One question: When running for a while, the upper radiator hose gets quite hot, but the lower hose remains cold. Shouldn’t that warm up as well?