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sounds like you need a new heater matrix.

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โˆ™ 2006-02-21 11:55:28
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Q: Your heater heats when air is being recycled but as soon as you open fresh air valve it turns cold The thermostat and coolant has been flushed and changed This is on a 1993 Mazda 323?
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form_title=Replace the Coolant Fluids form_header=The fluids in the cooling system need to be replaced regularly. When was the last time you go your coolant flushed?=_ If the thermostat needs to be replaced, would you like me to install a new one?= () Yes () No Have you noticed any leaks in your radiator?= () Yes () No

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