Question about 1997 Mercedes-Benz Mercedes Benz S Class Coupe

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I have just purchased an s500 coupe 1997. The automatic climate control seems to function but dont feel much air being blown from the vents. Could there be a mulfunction and hoe could I diagnose this issue

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Clean the pollen filter out ,its under the dash passenger side

Posted on Oct 24, 2010

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What is an ICP - RCC - Speedometer fuse for on a 1997 ford taurus dohc ICP - RCC?


Hey Brian ,
ICP - Integrated control panel
RCC - Remote Climate Control Module
Integrated Control Panel-Electronic Automatic Temperature Control
Control Assembly The Taurus, Sable vehicles group together the following systems into a single integrated control panel:
  • AM/FM stereo radio
  • clock
  • rear window defroster switch
  • electronic automatic temperature control (EATC)
  • full-logic cassette tape player
  • compact disc player control (optional)
The remote climate control module is mounted to the A/C evaporator housing behind the integrated control panel. The integrated control panel is connected to the remote climate control module with a dedicated two-wire communication link. The integrated control panel EATC features:
  • a vacuum fluorescent display (VFD) for displaying set temperature, ambient temperature, function and diagnostic trouble codes (DTCs).
  • electro-luminescent backlighting for all buttons and graphics.
  • function override buttons.
  • temperature control and blower speed rocker switches.

Jun 08, 2015 | 1997 Ford Taurus

1 Answer

1997 Ford Taurus front defrost not working


. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ?
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
  • The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
  • Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • Vacuum Control Motors The vacuum control motors (18A318):
    • are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
    • direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
    • The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).


vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

1 Answer

Defrost not working


Hello, and welcome to fixya! The reason that you are able to hear the climate control system and not feel the air coming out of the defroster, is that the damper (this controls where the air is directed when you change the vent selection on the climate controls) is not operating as it should. The damper is controlled by vacuum pressure, and the usual culprit is that the vacuum hose running to the damper is either loose, or defective(usually dry rotted) which will create a vacuum loss. Without the vacuum pressure to operate the damper, you will lose some, but not all functionality of the vent selection. I recommend that you check the vacuum line(s) that run to the damper, making sure that the vacuum hose is connected, and free of defects, like cracks, holes, and that the connections are not loose as hoses can and will lose their elasticity, which will create a vacuum loss. If that is not the issue, I recommend that you remove the climate control vent selector and make sure that all of the connections to the control panel are secure and free of defect. If that is not the issue, you may have a faulty damper (which is rarely the case), and that will need to be replaced. As far as the climate control lights not working, that could be a simple as a blown fuse, faulty bulbs, or even as simple as a poor connection to the bulbs, or to the control selector. I highly recommend that you disconnect and reconnect all of the connections to the unit. When you check the fuse panel, remove the fuse(s) & check for faults and make sure that the connection the fuse is making in the fuse panel is making a solid connection. I hope that you have found this information useful, are able to resolve the issues you are experiencing.

Jan 27, 2014 | Dodge Avenger Cars & Trucks

1 Answer

Air conditioning will not switch from defrost vents


Vacuum control motors are used to position these airflow control doors.
SECTION 412-01: Air Distribution and Filtering 2000 Expedition/Navigator Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/17/1999 Air Distribution There are two sources of air available to the air distribution system:
  • outside air
  • recirculated air
Recirculated air is only used during MAX A/C, AUTOMATIC (if equipped with EATC) and OFF modes.
Air distribution within the vehicle is determined by the function selector switch position, if equipped with manual A/C, or is controlled by the electronic automatic temperature control system in the AUTOMATIC mode but can be overridden by the driver if desired. Airflow control doors are used to direct airflow within the heater air plenum chamber. Vacuum control motors are used to position these airflow control doors.
The air distribution system is designed to provide airflow from the defrost nozzle when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak.
Air enters the passenger compartment from the:
  • instrument panel A/C registers.
  • heater outlet floor duct.
  • windshield defroster hose nozzle.
  • side window demisters.
  • rear seat airflow duct (if equipped).
Passenger compartment air is exhausted from the vehicle through open windows or cab air vents.


expedition air flow hvac system-xvcmtr1jbqa4kfrdszeh0lpe-3-0.gif Item Part Number Description 1 18A318 Vacuum control motor - panel/defrost door 2 18A478 Panel/defrost door (full vacuum position) 3 - Defrost airflow 4 - Side window demister airflow 5 18B545 Temperature blend door (full heat position) 6 19860 A/C evaporator core 7 19A813 Air inlet duct door (full vacuum position) 8 - Outside air inlet 9 18A318 Vacuum control motor - air inlet duct door 10 - Recirculated air inlet 11 19805 Blower motor 12 - Vacuum to emission control 13 - Vacuum from the engine intake manifold 14 19A563 A/C vacuum check valve 15 19A566 A/C vacuum reservoir tank and bracket 16 19B888 A/C-heater function selector switch 17 18476 Heater core 18 18A559 Floor/panel door (full vacuum position) 19 - Floor airflow 20 18A318 Vacuum control motor - floor/panel door 21 - Panel vent airflow
Check vacuum control to the panel defrost motor ( vac,diaphragm )

Nov 01, 2017 | 2001 Ford Expedition

1 Answer

2008 ford taurus X climate control system not changing functions


I have the same car and just fixed the exact same problem you just described.
It is NOT a vacuum problem. The blend door is electronically controlled my a small motor under the dash, to the right of the steering column. The clicking is coming from a stripped gear in that small motor unit.
On my Taurus X, what caused the motor to fail was the blend doors (which open and close depending on what your vent setting is on) getting stuck. That caused the motor gears to strip out and make a clicking sound every time the automatic climate control tried to move the blend doors.
The fix required a substantial amount of the dashboard to be taken apart. The blend doors were re adjusted and the motor control unit replaced.
I had the Ford dealership do the repair and it cost me $450. (Ouch!)
To make sure that's your problem, you can follow the clicking sound. You'll have to get on your back and look under the dash on the drivers side. Have somebody press the defrost button to cause the clicking sound. Once you find the small unit you can actually feel the gears slipping when it makes the clicking sound. It's really tight under there though and you'll probably need a flashlight.

Jan 06, 2012 | 2008 Ford Taurus X

1 Answer

Trying to figure out how many blend doors are in a 1996 Chevy 1500. It does not seem like all the doors are operating properly because I feel very little thru the vents and not as strong as it should be on...


There is 1 blend door for a vehicle with a main temperature control, 2 for dual driver/passenger climate control settings etc. The vents however which open and close to switch between defrost, floor, bi level etc may not be functioning properly. You should feel the same temp in all your vent outlets, whether you're getting the volume out of each is something totally different to address

Feb 01, 2011 | 1996 Chevrolet C1500

1 Answer

Air doesn't blow out of dash vents


If it has automatic climate controls.Look to either a blend door actuator or the ac programmer. A vacuum leak at the ac programmer or actuator can also cause this if they use vacuum.

Jul 17, 2010 | 1997 Buick LeSabre

1 Answer

My blower motor never work, and it's been getting cold so it's time to get it fixed. The heat comes on, and you can hear it changing from vents to floor and feel a little heat, it just dont blow. So I took...


You can purchase a repair manual for the car on ebay motors that will have a electrical component locator for $20.00, First try looking under the dash board in the general area of the glove box to locate the heater box the fan resistor will have 3 or 4 wires going to the side of the heater box it is held on by small machine screws usually remove with a 1/4" socket wrench with the appropriate size socket usually an 8 or 9 mm hopefully you can change it yourself you may need to remove a cover underneath to gain access to the heater box if not get the cd repair manual on ebay to walk you through the repair.

Oct 02, 2009 | 1997 Chrysler Concorde

1 Answer

Need to reset climate control unit on 1997 s500


hello,good day,you can reset your all electrical system by removing the negative cable,but be sure you have radio code,or you can go your dealer to scan your fault,using hht or star to that you know what system have fault even it is temporary,ty

Jun 27, 2009 | 1997 Mercedes-Benz Mercedes Benz S Class...

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