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Re: 98 3.0 Heater core
Why do you suspect your heater core? If it's leaking, you'll see coolant coming out. If it's clogged up, feel the temperature difference between the heater hose going in and one leaving. If there is no noticeable difference, then either the heater valve is not working or your core is restricted. Also check the operation of the louvres. They may not be positioning correctly in response to the switch, and of course your blower is OK?
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