No way around it, you'll have to disconnect the tube to get it out of the way, just like you did the windshield wiper apparatus. I didn't have to contend with that tube when I replaced my 986's heater core recently, but it's still much easier than it is on most other cars. I had to disassemble the entire dash to get to the heater core in a Pontiac.
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2000 986 base
Arctic Silver/black
2.7 liter
5-speed manual
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