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The control head is a plug-in part. Access it by carefully prying off the plastic trim around the climate control and radio. The trim snaps on in several places. You may find control heads in junkyards, but most have the same problem with the hot on one side/cold on the other that is discussed frequently on this board. New ones aren't much better. I replaced mine under warranty at the dealer, and it was worse than the original, so I had them reinstall the old one. The issue is a design flaw with the controller and temp sensors.

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Q: Can i fix or replace Heater control system for 1998 Oldsmobile?
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