Mr. Meehan,
Thank you very much for your reply.
Does it mean the dealer should not charge me 3 hours for labour to replace the water pump because they had already charged me $335.95 (suppose it includes the labour cost in it) for replacing the timing belt.
Regarding why I bring my car to the dealer, 1) I guess the work they perform should be reliable; 2) I am new in this city and have not established a lot of friends/neighbors yet; 3) I have no idea which independent shop in this city is good or reliable; and 4) this is the only one Toyota dealer in this city.
I appreciate very much for your comments, I will take your approach after I established more friends in future.