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Check basics first: is there hot water being fed to the heater core?,does the valve work (open/close)that feeds water circulation to the heater core????. Hope this helps. Alberto
The module for the heated/cooled seats is underneath the front passenger seat. Buick had a problem with poor contact on the connector plug resulting in a melted connector. The module is mounted to the bottom of the seat and although it's tight, you can remove the two nuts holding it in place and pull it out to the front of the seat to access the connectors (there are 3). I had a burned connector on the biggest connector. I found a replacement connector (12-cavity) and terminals on eBay and just finished wiring the new connector. Results are disappointing because the driver's seat still doesn't work and the passenger's seat doesn't work all the time. Guess it's time to invest in a new module.
First hook up Positive Red and Negative Black terminals to the battery in the known good car. Then hook the Red terminal on the opposite end of the jumper cables to the positive Red terminal of the battery in the known bad car. Then, carefully, without shorting out the connectors, connect the final black jumper cable to the 'frame' of the known bad car.
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