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Having an issue with the heater in my 2000 Boxster S.  It fogs up the windows when the heater is on.  If I turn the AC button on the fog stops but the air temperature is no longer hot or warm even.  The moisture coming out seems to have an odd smell to it.  It's either old nasty water or perhaps antifreeze.  Any help would be greatly appreciated.

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1 hour ago, FStallcup said:

Having an issue with the heater in my 2000 Boxster S.  It fogs up the windows when the heater is on.  If I turn the AC button on the fog stops but the air temperature is no longer hot or warm even.  The moisture coming out seems to have an odd smell to it.  It's either old nasty water or perhaps antifreeze.  Any help would be greatly appreciated.

 

It sounds like you have a failing heater core.  This can be confirmed by pressure testing the cooling system, which should not hold if the heater core is failing.  If it is bad, it is not a bad DIY job to replace it as it pulls up and out from under the front hood.

 

Good luck.

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