BoBKa

Hi there!
I`m the one of the lucky onwers of E430 , but have some problem with air conditioner.
The problem is:
When I`m starting enginge (AC is turned on), first ten minutes goes cold air, everything is allright, but then, air becomes warmer and warmer...
I think the problem is with FANs (on radiator), because they don`t start to spin

So, is this problem is common for W210? Who had it? How to diagnose, is it problem with FAN or with any electrical equipment? Maybe be problems with some of fuses?

Thanks for attention.

P.S. I`m from Latvia, sorry for broken English.

citruspilot

Sounds like a visit to the AC shop would be a good starting point. Get an estimate. Most shops will estimate the job and tell you whats wrong for a diagnostic fee..................... Could be a simple fix. Then again, maybe not!

Good luck though............

Jeff

lexrex

Your evaporator temperature sensor is defective. Your A/C will work normally once you replace the sensor. It's an inexpensive repair.

BoBKa

Thanks guys, I`m in queue to the service till next monday I will write here the reason of the problem when I`ll fix it.

BoBKa

Hm...FAN doesn`t spin because of evaporator temperature sensor? Is this sensor is responsible for this FAN?

Musikmann

My 1998 E430 had A/C problems too and it turned out to be a leaking compressor (I hope your situation is different because that was expensive).

Your car has 2 fans; 1 is the main radiator fan (shaft driven), and the 2nd is an auxillary fan that runs off a tiny belt (it is only supposed to run when the engine gets pretty hot). It was found that my belt was missing so that might be the fan you see not turning.

Good Luck!

1benzguy

Just hold the rest button untilm the 'secret menu' comes up, advance it with the auton button.
This will tell you exactly what is wrong.
M

BoBKa

I`ve tried it already, but there were no errors, pressure is ok, looks like everything is ok, except FANs. I also tried to turn these FANs on by connecting with two wires (+/-) directly to the battery (12V), but they don`t work...Also, evaporator temp. sensor shows 60 degrees, i`ve heard that it is too high.

lexrex

Yes, the evaporator temp sensor can cause the fan not to spin. The fan doesn't spin when the compressor is off. The compressor is switched off when the evaporator temperature sensor is faulty.

Your electrical tests suggest a problem with the fan itself. The A/C should still work without the fan spinning, just not as well. Remember that you still have the engine fan and passive airflow when driving.

A/C blowing cold for 10 minutes and then becoming warm is virtually diagnostic of a bad evaporator temperature sensor. Since you don't have an error code for the sensor, the problem certainly can be something else.

BoBKa

Thanks for feedback! Anyway, on monday I`ll go to service to repair/replace FAN and evap. temp. sensor !

Air Marshall Eldritch

Hey, I didn't know about this secret. Thanks!

BoBKa

I can tell you one more secres!
Start engine
Left side: HI
Right side: LO
Then push together EC and REST, and wait for a 10 secs, the climate shuts off, then press right "AUTO" and it will show you your errors, to see next error press one more time "AUTO", to erase errors press both AUTO buttons and wait for a 10 secs.
A little bit about errors:

210 Chassis from 9/95
READING ACTUAL VALUES
1. IGNITION : Position 1
2. Press the AUTO button
3. Set both temperature selectors to 72 degrees F.
4. Press the REST button for more than 5 seconds.
5. The left display will alternately show the number "1" and the in-car temperature.
6. Press the AUTO button and the next component number and its value will be displayed.
7. Press the REST button to end the test program.
COMPONENT UNDER TEST
Number Component
01 In-Car Temperature Sensor with Aspirator Blower (B10/4)
02 Outside Temperature Sensor (B14)
03 Left Heater Core Temperature Sensor (B10/1)
04 Right Heater Core Temperature Sensor (B10/1)
05 Evaporator Temperature Sensor (B10/6)
06 Engine Coolant Temperature (ECT) Sensor (A/C) (B1/4)
07 Refrigerant Pressure in Bar
08 Refrigerant Temperature Sensor (B12/1)
10 Blower Control Voltage
11 Emissions (Refrigerant Leak) Sensor (B31)
12 Sun (Excessive Heat) Sensor (B32)
20 Control Current for Auxiliary Fan exp. : 7 = 7 mA
21 Engine RPM. example 00..99 (x100) = 9900
22 Vehicle Speed
23 PIN 58D exp. 99.0 = 99% of Battery Voltage
24 Battery Voltage : 12.8 = 12,8 Volt
40 Software Version Encoded
41 Hardware Version

210 Chassis from 9/95
FAULT DIAGNOSIS
1. IGNITION : Position 1
2. Left Temperature selector wheel : HI
Right Temperature selector wheel : LO
3. Within 20 seconds press the REST and EC buttons simultaneously for more than 5 seconds.
4. The LED in the RECIRCULATE button flashes and "dI R" appears on the display
5. Press the right AUTO button until all DTC's are displayed and recorded.
6. To erase, all codes must be read out. Press both AUTO buttons simultaneously for more than 2 seconds. "d" will be displayed
on the left and "FF" is displayed on the right. The erase can be canceled by pressing the AUTO.
7. Reset temperature selector to normal setting.
8. IGNITION : OFF to end the test program.
FAULT CODES - 210 Chassis from 9/95
DTC Readout Description
026 CAN - Communication
226 In-Car Air Temperature Sensor (B10/4)
227 Outside Air Temperature Sensor (B14)
228 Left Heater Core Temperature Sensor (B10/1)
229 Right Heater Core Temperature Sensor (B10/1)
230 Evaporator Temperature Sensor (B10/6)
231 Engine Coolant Temperature Sensor (B10/
232 Refrigerant Pressure Sensor (B12)
233 Refrigerant Temperature Sensor (B12/1)
234 Sun Sensor (B32)
235 Emissions (Refrigerant Leak) Sensor (B31)
241 Refrigerant Level
416 Coolant Circulation Pump (M13)
417 Left Duovalve (Water Valve) (Y21y1)
418 Right Duovalve (Water Valve) (Y21y2)
419 A/C Compressor Electromagnetic Clutch (A9k1)
420 Closed (Idle) Throttle Speed Increase
421 Pulse Module
422 Serial Interface Connection (K1) to Instrument Cluster (IC)
423 Switchover Valve Block (Y11)
424 Activated Charcoal Filter Actuator (A32m2) : OPEN
425 Activated Charcoal Filter Actuator (A32m2) : CLOSE
432 Maximum Heat
459 Serial Interface Connection (K2) to Instrument Cluster (IC)
462 Wide Open Throttle (WOT) Position Signal - Diesel Engine Only

Quite useful info

citruspilot

And to think those master techs went to school for many years to get this info and here it is right here!

Is this top secret?

Jeff

chadmb

awesome thanks