Hi everyone,

I'm troubleshooting a couple of issues with the HVAC in my 2000 C230 (W202). It has the manual HVAC setup.

1. Blower fan blows irregularly. Basically, the only reliable settings are "OFF" or "MAX," all the settings are unreliable and will change blower speeds randomly (e.g. going over bumps). Is this the regulator or could this be a problem with the fan speed control dial?

2. The heat control is a little variable. It occasionally will suddenly blow very hot or very cold regardless of the temperature dial. Also, if I leave the temperature dial alone, the amount of heat that comes out of the vents slowly goes down over time. Any ideas on this one?