Question about 1994 Mercedes-Benz E-Class

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Only low fan speed on my mercedes c280 with climate control

When setting the temperature fan speed is low and barely changes, if you set it on manual, it is moderatley faster but not as it should be, and this also affects the front window defroster    thank you

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You need to replace your blower resistor....

Posted on Jan 10, 2009

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Posted on Jan 02, 2017

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Need a wiring diagram of the 2 wires from the temp sending unit that controls the temp gauge and cooling fans on a 99 grand am gt. Need to see where they go They disappear behind the engine


The PCM regulates voltage to the coolant fan relays, which operate the fans. Refer to Engine Controls.

Engine Cooling Fan Description - Electric
The electric cooling fans are used to lower the temperature of the engine coolant flowing through the radiator. They are also used to cool the refrigerant (R-134a) flowing through the A/C condenser.
Operation
The electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the PCM. The cooling fan has one speed. The PCM turns the cooling fan ON by grounding the coil of the cooling fan relay when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.
Power for the cooling fan motors are supplied through Cool Fan #1 and Cool Fan #2 relays. The cooling fan relays are energized when current flows from the fuses in the Cell 23: Cooling Fan Controls , and through the relay coils to ground through the PCM. The Low Speed fans control circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The High Speed fans control circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.
Important: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.
If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 should set. A problem with the ECT sensor should set DTC P0117, P0118, P1114, or P1115. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Cooling Fan Diagnosis tables. The Cooling Fan Diagnosis tables should be used to diagnose the PCM controlled cooling fans only, if a DTC has not set.

The engine coolant temperature (ECT) sensor (3) is a thermistor, a resistor which changes value based on temperature, mounted in the engine coolant stream. Low coolant temperature produces a high resistance (100,000 ohms at -40°C) (-40°F), while high temperature causes low resistance (70 ohms at 130°C) (266°F).
The PCM supplies a 5 volt signal to the ECT sensor through a resistor in the PCM and monitors the terminal voltage. Since this forms a series circuit to ground through the ECT sensor, high sensor resistance (low temperature) will result in high PCM terminal voltage. When the resistance of the ECT sensor is low (high temperature), the terminal voltage will be drawn lower. This terminal voltage indicates engine coolant temperature to the PCM.
A hard fault in the ECT sensor circuit should set either a DTC P0117 or P0118. Remember, these DTCs indicate a malfunction in the engine coolant temperature circuit, so proper use of the DTC table may lead to either repairing a wiring problem or replacing the sensor, to properly repair a problem.

The engine coolant sensor is an input to the PCM , Two wire's both go to the PCM .An the PCM turns on the cooling fans !

DTC P0480 Cooling Fan Relay 1 Control Circuit
DTC P0481Cooling Fan Relay 2 Control Circuit
The Body Control Module (BCM) request the cooling fans. The BCM sends a Class 2 message to the PCM in order to enable the fans based on various inputs. Thebattery voltage travels to all three cooling fan relay coils. The PCM enables cooling fan relay #1 by providing the ground path. The PCM enables cooling fan relays #2 and mode control together by providing a ground path. The left and right cooling fans are connected in series. This will enable both fans on low speed when the fan #1 relay is energized. When all three fan relays are energized, both fans will operate at high speed. The high speed is possible because the fan relays are wired in a parallel circuit. When the PCM detects that certain DTCs are set, the PCM will enable the cooling fans.
The PCM will enable the engine cooling fans when certain Diagnostic Trouble Codes are set.

Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.
1
Did you perform the Instrument Cluster System Check?
--
Go to Step 2
Go to Instrument Cluster System Check
2
Turn the ignition switch to the ON position.
With the scan tool select Instrument Panel Cluster, Special Functions, Instrument Panel Cluster (IPC) gauges.
Perform the Coolant Gauge Sweep Test.
Does the coolant temperature gauge complete a full sweep when commanded?
--
Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls
Go to Step 3
3
Replace the instrument cluster. Refer to Instrument Cluster Replacement .
Did you complete the repair?
--
Go to Instrument Cluster System Check
--

Your best bet would be to take your vehicle to a qualified repair shop that knows how the system works . An has the tools to diagnose the problem .

Nov 13, 2016 | 1999 Pontiac Grand Am GT

1 Answer

Fan /blower in my Mercedes S280 1998 model not working no noises Just wont blow. All switch lights related to A/C ventilation are ok.


http://www.autozone.com/cooling-heating-and-climate-control/a-c-heater-blower-motor/everco-a-c-heater-blower-motor/mercedes-benz/c280/1998/6-cylinders-2-8l-mfi-sohc/385580_0_1526_5281/?checkfit=true

Jan 23, 2016 | Cars & Trucks

1 Answer

Unable to change temperature settings on the automatic control now


Troubleshoot Automatic Climate Control System

www.aa1car.com/library/automatic_climate_control.ht
Once you set a temperature on your car's automatic climate control system, ... you turn down the blower speed or change the position of the temperature setting. ...codes (which ordinary engine-only scan tools cannot), and a digital voltmeter to ...

Sep 12, 2015 | Cars & Trucks

1 Answer

Have a 2009 Nissan Quest I can't turn the heat off. Just stays on a high level of blowing out heat .


If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.

Feb 23, 2015 | Nissan Cars & Trucks

1 Answer

Why is the fan not working that controls my air condition and heat?


You have four possible problems. Fuse, fan motor, fan switch, or fan speed controller. The first step is to check your fuses. Actually pull the fuses for the climate control out and look at them (sometimes cracks and end corrosion don't show up until you remove the fuse). Your next step is to run the car with the A/C fan set to high and use a multimeter to check for power and ground at the blower motor. After that I need an answer to the following question diagnosis can go any further. Does your car have knobs for the climate control system or a vertical row of buttons?

Sep 30, 2014 | 1980 Mercedes-Benz 280 SLC

4 Answers

What do i need to service my car mercedes benz c200 kompressor?


i have a Mercedes Benz C200 Kompressor , I just changed the plugs, air filter and oil filter and put new oil, but it's now miss firing badly can some one out there help?

Sep 08, 2010 | 2000 Mercedes-Benz C-Class

1 Answer

A/C wont turn on


it is either the low pressure switch or the relay

Jul 04, 2009 | 1996 Mercedes-Benz C-Class

2 Answers

Climate Control buttons don't work


are you saying u can't change the air temperature? do the blower speeds work ok? can u change the locations the air comes from, i.e. dash registers, defrost, floor?

Jun 28, 2009 | 1999 Chevrolet Blazer

2 Answers

Volvo v50 2005 climate control puts out heat on driver's side and windshield when AC is on or temperature control is at low. Passenger side puts out cold air. Both sides of climate control are set at low.


I had the same problem. AC computer forgot where the adjustment flaps are.
- Start the car.
- Press Auto button on the AC (if you have this option)
- Increase fan speed (make shure it is not on minimmal setting)
- Decrease the temperature setting to the minimum -> "Lo"
- Wait about 10-20 seconds
- increase the temperature to the maximum -> "Hi"
- Wait about 10-20 seconds
- Set the temperature that you like.

With this procedure you force the AC to move the temperature regulating flaps to go to both end-positions and motors get calibrated again.


If this does not help, there must be a bad contact somewhere or the fpals may get stuck. -> repair.

Jun 22, 2009 | 2006 Volvo V50

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