Thanks for saving me a lot of grief and money. Coolant was coming out from the timing belt cover on the passenger side, and as you suggested, the radiator hose was leaking. The radiator hose clamp broke and I guess it was installed by the previous owner, who replaced the engine with a newer one, but of course all the hoses are quite old (1999). It's not leaking anymore since I added a new hose clamp. Luckily I only drove 2-3 miles while it was leaking. Guess I should try to use an OEM clamp instead of the hose clamp.