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Are you talking about no heat from the vents? Or no air coming from the vents? The most common would be that the blower motor shuts off intermittantly, and the fan will stop working. This would be caused by a faulty blower motor regulator. There has been a new one out for quite awhile, but its possible that your car never got the updated one. This can probably only be purchased from your local dealer, as they will always give you the most updated part. Its a pretty easy install if your going to do it yourself. Its located up under the dash on the passengers side.
What else can I help you with?
Why is there no heat coming out the vents on your 2003 Mercedes Benz E-320?
If there is no heat coming out of the vents, but there is air coming out on a 2003 Mercedes Benz E-320, check the thermostat to make sure it is not sticking. If this is okay, check the heater core. If the heater core is bad, there will be water on the passenger side floorboard.
What size engine does the 2003 Mercedes-Benz S-Class have?
The 2003 Mercedes-Benz S-Class has a V8 engine.
How many valves does the 2003 Mercedes-Benz M-Class have?
The 2003 Mercedes-Benz M-Class has 18 valves.
What size engine does the 2003 Mercedes-Benz SL-Class have?
The 2003 Mercedes-Benz SL-Class has a V8 engine.
How many valves does the 2003 Mercedes-Benz CL-Class have?
The 2003 Mercedes-Benz CL-Class has 24 valves.
What size engine does the 2003 Mercedes-Benz CL-Class have?
The 2003 Mercedes-Benz CL-Class has a V8 engine.
How many valves does the 2003 Mercedes-Benz G-Class have?
The 2003 Mercedes-Benz G-Class has 24 valves.
How many valves does the 2003 Mercedes-Benz S-Class have?
The 2003 Mercedes-Benz S-Class has 24 valves.
How many valves does the 2003 Mercedes-Benz E-Class have?
The 2003 Mercedes-Benz E-Class has 18 valves.
What size engine does the 2003 Mercedes-Benz M-Class have?
The 2003 Mercedes-Benz M-Class has a V6 engine.
How many valves does the 2003 Mercedes-Benz C-Class have?
The 2003 Mercedes-Benz C-Class has 16 valves.
How many valves does the 2003 Mercedes-Benz SLK-Class have?
The 2003 Mercedes-Benz SLK-Class has 16 valves.
