I have a 2004 Sprinter 2.2 Diesel, the heater does not get hot on the high setting (just warm) and the air conditioner does not get cold on the low setting (only cool) When I adjust the dial that adjusts air from screen to vent to floor very little air comes out of vents or to screen to demist.
I'm at a bit of a loss as to how to get into the heater controls without breaking anything, any help would be appreciated.
Could you add some background info first:
- is the engine temperature normal (thermostat OK)?
- does the AC indicator light work normally (if there is an issue, the indicator may blink shortly or remain at the off-position even when activated from the button).
Are you sure your HVAC blower motor is working fine? The regulator at the motor (or the resistor on older models) fails quite often. The result being either only some of the settings working or almost random behaviour (the fan speed may not follow the adjustment and may at times stop or even come on at full speed).