2001 Volvo S60 electrical system problems

My wife drove the 2001 volvo s60 and noticed a noxious burning smell and immediately drove it home. She thought it was something extremely wrong with the heater. I drove the car 3 days later and after 3 minutes noticed the burning smell as well. I turned off the heater, and the smell continued. I saw some smoke to my left side and noticed the seat had a hole that was melting and burning. I turned off the heated seat and ensured the seat did not burn further.

In october 2007, I inquired of fields volvo of waukesha wisconsin, about a malfunctioning temperature gage. The gage would often display a faulty reading, showing that the car was overheating when in fact it was not. When I bought my car in for an inspection of the matter, jason fischer service advisor, informed me that I needed an electronics bo ( see attached receipt). He assured me that was the problem, so I agreed to allow him to replace it and was charged $537.15 for the procedure.