I poured in coolant into my coolant reservoir yesterday. But after 30 min of driving, the coolant in the reservoir is all gone. The meter didn't show that my 1993 240SX is overheating.
Could the problem be that I didn't open air relief plug when I flush and refill the coolant? Or the water pump is leaking?
http://www.240sx.org/faq/articles/coolant.htm
Thanks!