Question about 2001 Mercedes-Benz C-Class

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The a/c sounds like it is blowing but no air is coming out of the vents only happens on long drives

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This paticular climate control system uses stepper motors unstead of vacuum elements to control the blend door positions. The best way to diagnose this problem is to have the climate control computer scanned for codes and then you will have a beter idea of which component is failing. You can pull codes riht from the climate control head unit but you would need to purchase a factory manual to explain how to do this and what the codes mean.

Posted on Jul 21, 2009

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1 Answer

Hot air blows into car from underneath of car what is causing this


does the air blow in when the car is not moving. if it does, your heater switch is on and blowing hot air in through the bottom vent.

Apr 01, 2014 | 1997 Ford Taurus

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Heater blows hot air only out of front vents, not floor or defrost when I switch to those zones


the dampers are failing.
first check fuses.... as always.....
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the FSM covers the tests, on this. electric is hardest.
if cable drive, just look are they working>? simple it is.
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Dec 10, 2013 | 1998 Toyota Camry

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2003 ford expedition i just got it a week ago and the front heat works great but the back vents only blow cold air. How do i fix this?


With the car parked and engine idling, turn the ventilation control between windshield defroster and "open air ducts" to front and rear vents. Listen to pinpoint where the valves are that open and closes the air ducts. It sounds like the air duct to rear vents are blocked, and the cold air in rear air duct is coming from "outside ventilation." The air vent to allow hot air to the rear vent is stuck in "open ventilation" mode, like when you're driving in spring or summer months.

Nov 29, 2013 | Cars & Trucks

1 Answer

Front defogger blows out heater vent when set on DEF. All of the heater, a/c, settings work properly. One day, I turned on the DEF and the warm air blows out of the heater vents, not the defroster area. I...


Sounds like the flap valve in your vent system that allows air to go to the defrosters is either jammed or broken. Unfortunately you will have to take the vent system apart to look.

Nov 05, 2009 | 1989 Oldsmobile Cutlass Ciera

1 Answer

WHITE EXAUST SMOKE WATER VAPORE COMING THROUGH AIR VENT CUTS OUT WHEN DRIVING LIGHT COMES ON AN OF CAR ACTS UP BURNS OIL


Well, this definitely sounds like you have a blown head gasket, and maybe a busted heater core (water vapor out of air vents). Both were probably caused by the car overheating creating a lot of pressure in the cooling system and blowing the head gasket(s) and maybe the heater core. The vapor out of the vents could also be caused by external coolant leakage of the head gasket on the hot engine bringing the vapor inside the cab via the heater fan...

I'd get that checked before any major engine damage happens...

Sep 09, 2009 | 1989 Ford Mustang

1 Answer

The fan sounds like it's blowing but little air comes out.


The A/C blender doors on the 2006 Ram are defective and are prone to breaking. Call your local dealer and ask them if they've heard of this problem. My truck had the same issue and Dodge repaired it under warranty. Good luck.

Aug 19, 2009 | 2006 Dodge Ram 1500

1 Answer

A/C not working in my 2003 Nissan maxima GLE-- the gauges light up appropriately, but the fan doesn't blow. It does get cold, I can feel the refrigerated air gently blow though the vents if i'm driving...


The most likely cause of your concern would be the fan control amp. It is located behind the glove box. It controls the ground side of the blower motor. But before replacing it, check to see if you have power and ground at the blower motor.

Jul 22, 2009 | 2003 Nissan Maxima

1 Answer

Acceleration no air, foot off gas air barely blows out vents


The vent is controlled by vacuum. Check the condition of the vacuum hose associated with the vent control. What is happening is when you decelerate, the intake manifold vacuum increases, and a diaphram is slightly pulled giving you air in the vent but very little. In normal condition the diaphram wont even pull. Solution is check for a vacuum leak in the vent control trace it coming from the intake manifold.

Jun 30, 2009 | 2000 Chevrolet Lumina

1 Answer

Air not blowing out of the vents of my 2003 Dodge Durango


From what I hear it is a vacuum line issue. Mine is doing the exact same thing. So, I am going to get a diagram and try checking the vacuum lines to see if any are loose or tore

I go under the dash and feel the air flowing out the floor and it is coming out of the defrost, also. I noticed under the drivers side today that air is flowing and there seems to be a gap in between a part under there. There was some material stuff I saw around the edge of it that sticky brown stuff and it sometimes before came out my vents all the time. Anyways, not sure if my air is just not sealed good to blow out the vents but it is something that happened not long ago and we've not done anything under our dash area.

Jun 15, 2009 | 1999 Dodge Durango

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