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OK, FWIW, I am returning here just in case others have the same problem years from now and want to read through this frustrating ordeal of mine to get to the root of the problem.
Hans called tonight to say that his climate control unit, which acted the same as mine when installed in my car, works fine. He tried it on another Boxster this morning.
So, he's got me checking relays now and says that if its not a relay, it may be the fan resistor found near the fan under the passenger side of the dash.
While I'm glad it's not the $300 part (digital display controller) I am frustrated. I do not want to drive to Fredericksburg weekend after next for Boxtoberfest in blistering Texas heat. The wife will gripe both directions and wonder why I didn't cancel!
I gotta get to the root of this problem and get it fixed ASAP!
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