general problems of the 2008 Volvo S40

After buying the vehicle on 7/9/21, the car started having problems with the cooling system. I took it to a repair shop and they said the cooling system was overfilled. The air problem continued. I took it back to the dealership who said they fixed it but it continued. I contacted the prior manufactuer service center who informed me the computer chip was recommended to be replaced when the dealer had it serviced but they declined, causing all the electrical and cooling issues. I called the dealer and they said they had the alarm disconnected also which was why the computer system wasn't working. The alarm system doesn't work and I have had to replace the key fob 3 times. I took it to another repair shop who diagnosed the following as permanent failure codes: 6 cem codes, 1 ecm code, 6 srs codes, 2 dim codes, 11 cem-hs codes, passenger and driver door codes, 4 climate control codes, 1eps code, 4 swm codes, dd11, all of which are safety hazards.