I’m looking for some help. 2000 LS and my a/c will work sometimes and not others. Scenario: I will be sitting at a stop light and the passenger side will start blowing hot air. Another Scenario: Driving down the road passenger side will start blowing hot air, then the driver side will. A minute or so later driver side a/c kicks on. Etc. This has my mechanic baffled. Any help would be appreciated.