01-06-2015, 09:11 PM
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#2
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Motorist & Coffee Drinker
Join Date: Jul 2014
Location: Oklahoma
Posts: 3,671
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I'd suspect that the heater core is getting clogged.
I didn't see a DIY for the Boxster, but here's an Audi/VW DIY:
Audi A4 1.8T Volkswagen Heater Core Flush | Golf, Jetta, Passat & Beetle | Pelican Parts DIY Maintenance Article
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