Question about 1999 Mercedes-Benz S-Class

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Driverside a/c not cool

Automatic temp.no cool air driverside

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  • blackdog16 Jul 06, 2008

    passenger side is working ok

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You Could Have A Blockage Or **** Pipe There The Only Possible Reasons i can think of

Posted on Jul 06, 2008

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This can be a possible massive vacuum leak.
Check this link for the aircon diagnostics so you can figure out what is the real problem http://www.mercedesshop.com/Wikka/AcDiags

Hope that helps..........

Posted on Jul 06, 2008

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Check that the air conduct is not closed or obstructed, it can also be a hose out of place near the conditioner

Posted on Jul 06, 2008

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This has to do with the airflow router. It is a door that is either electronically or vacuum operated, and directs the airflow to the different ducts. If it's electronic then either the control module has gone out or a wire has come loose. With a vacuum control, it's usually a hole in a vacuum tube or a tube has come loose. It could also be that one of the ducts has come loose or is plugged.

Posted on Jul 06, 2008

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1 Answer

Ac does not cool. on max driver side air temp higher than passenger side. neither cools but Freon ok.


Sounds like the blend door is not closing all the way to seal off the heater core. Locate the plenum and the levers that are on it. Check to see which one is for MODE and which is Blend. Make sure they are not broken or loose. Also something that falls in the defrost vents can end up in the plenum and cause problems.

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Aug 25, 2010 | 2002 Chevrolet S-10

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Cold air comes out driverside but not passenger side


if it has dual climate control -- drivers and passenger temp control-----
it could be a temp blend actuator, if it has only one temp adjustment,
it could be a door concern inside the plenum behind the inst panel.

Jun 02, 2010 | 2002 Ford Explorer

1 Answer

It has dual heating and cooling. The air is on


sounds like the blend door motor is bad on the driverside, its located on the heater box, here a diagram to help you locate it.it is on the driverside of the box, heres a picture of it, this is a single zone yours is daul you will see the pass/side motor the driverside i pointed to its location on your car. hope this helps you.bae6268.gif

Jan 27, 2010 | 1998 Oldsmobile Intrigue

1 Answer

I have a 2003 Jeep Grand Cherokee Overland with automatic climate control. The drivers side blows cold air constantly. It has no heat.


sounds like the blend door motro may be bad, this motor is screwed to heater box, there are a few of these motors one for pass/side for hot/cold air then one to control position of air like defrost or vent or floor, then the driverside cold/hot air, i think this motor is on driverside part of heater box, to make sure locate each motor while moving all controls until you spot the one that doesnt move, then remove it and move door manualy to see if you get heat, then replace that motor, hope this helps,

Dec 26, 2009 | 2003 Jeep Grand Cherokee

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Overheating in my 1995 Grand Am SE.


you could try that special stuf for your toilet to flush out any debri plug one side of the radiator real thight fill it with the toilet stuf with boiling water follow the instuctions on the bottle its a thought

Jul 30, 2009 | 1995 Pontiac Grand Am

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Car runs hot at an idle. turn on the air and the fan comes on and cools off . does the ect control the fan function when the air is off? 1994 camaro 3.4.


The Cooling fan is Wired in in such a way so as to Automaticly Turn on Cooling Fan If the A/C is Switched ON. If "WITHOUT the A/C on" The Cooling Fan Doen NOT come ON Untill Engine. is @ 210-230 Degrees
There IS a Problem with the Engine COOLING SYSTEM, A Faulty Coolant Temp Sensor Will Cause this Problem. The Cooling fan is Also A Candidate For Testing.

Answering your Quwstion YES The Engine Coolant Temperture Sensor Tells the ECM What the TEMP Is and the ECM Grounds the Cooling FAN Relay to Turn ON Cooling FAN. Temp Sensor is the Usual Culpret, BUT Relay Comes in a CLOSE Second. Hope this Helps !!!

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1 Answer

No heat 1997 chevy lumina


open pasenger door there on side of dash or unde hood neer driverside windshield

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1 Answer

2004 dodge ram is over heating, the thermostat and fan clutch have been replaced.Doesn't(over heat) in cool weather,but will in mod. weather if driven over 70mph or hilly terrain due or increase of rpm,and...


Water pumps can stall out, but do you have air trapped in system.
Had you recently had the system "open" to replace hose, thermostat, temp sensor. Some Ford and GM have a bleeder screw on a high point in cooling system to bleed out trapped air.

Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

IF the engine is overheating the trans CAN overheat
IF the trans is overheating the engine CAN overheat

They share the same cooling source and trans fluid gets hotter than oil, but yet it has a wimpy cooler built into radiator. Maybe add trans oil cooler to system.

Also outside temp affects the cool down rate of the radiator, ie...hot air trying to cool down hot radiator/engine is less effecting than cool air cooling hot radiator/engine

Aug 06, 2008 | Dodge Pickup Cars & Trucks

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