I bought this heater core about two years ago and installed it on my 2002 Montero XLS. No problems or leaks since. If you're only getting heat to the driver (left) but cold to the passenger (right), your heater core is probably partially clogged (or you may have an air pocket in the core). When replacing a core, be sure to flush the cooling system thoroughly to prevent clogging of the new core.
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