Customer has 18 y/o Carrier systems that operates for main level. System is not cooling due to failed compressor. Noticed that main level AC disconnect was in OFF position upon arrival. Tested dual capacitor and contactor. Water protection is poor. Blower wheel cleaning needed. Run capacitor is bad. Flue vent is single wall and incorrect. Informed customer of all findings. Due to age and condition of system, experiencing major component failure and no longer under warranty, advised customer to seek options to replace system. Based on our findings today, it might be time to think about getting a brand new system.