[lextoy35]

long time reader, first time post
my 99 clk430 seems to be gettinh warmer than usual in traffic.
i think my dual cooling fans are not running, the ones in front of the radiator.
do they always come on when the AC is turned on??? i never bothered to check before...
my temp is creeping above 80, it never did that before.
does anyone know where the relay is for the fans, and where the Tstat is for them??
i checked the fuse box, all fuses that are fan related are ok.
the fans are not jammed, they spin freely, just never go on.
what temp should they kick on at???
thx
PS
i think this problem caused my crank sensor to shut down the engine just recently, so i'm lookin for that too...
all is running well now, but want to fix fans and then see if crank sensor cuts engine again or not...

 

[Check Codes]

long time reader, first time post
my 99 clk430 seems to be gettinh warmer than usual in traffic.
i think my dual cooling fans are not running, the ones in front of the radiator.
do they always come on when the AC is turned on??? i never bothered to check before...
my temp is creeping above 80, it never did that before.
does anyone know where the relay is for the fans, and where the Tstat is for them??
i checked the fuse box, all fuses that are fan related are ok.
the fans are not jammed, they spin freely, just never go on.
what temp should they kick on at???
thx
PS
i think this problem caused my crank sensor to shut down the engine just recently, so i'm lookin for that too...
all is running well now, but want to fix fans and then see if crank sensor cuts engine again or not...

I'd unplug the fan and pass 12V to it and see if it comes on. FWIW only one has a motor, the other is driven off of a little belt from the first. If it doesn't come on when you pass 12V to the fan then you know it's the motor.

If you haven't replaced your CPS, then go ahead. Once it starts to act up (and yes overheating can trigger it) then it's toast, so don't worry about seeing how it is after the fan repair.

Take care and enjoy the ride,
Greg

 

[lextoy35]

i cant find any plugs/wires coming from the fan area. i think i might have found the wires, but they just flow right into the loom on the drivers side btw the headlight housing and radiator...
mine dont look like the 2nd is belt driven either... hmmm

 

[Check Codes]

i cant find any plugs/wires coming from the fan area. i think i might have found the wires, but they just flow right into the loom on the drivers side btw the headlight housing and radiator...
mine dont look like the 2nd is belt driven either... hmmm

My bad, I was in my 210 head, please forgive me. You do indeed have two fans, here is a pic of the right one so you can see where the connector is:

It is unlikely that they both would have stopped working at the same time, so it likely will be a relay or sensor that has failed. However, I would still check the fans first because it is possible one died and you didn't know until the second one did. Did you check for codes? There are some codes for fan circuit malfunctions and coolant sensor malfunctions that could be pending even without a CEL.

And back to an original question, yes when you turn on the AC the fans should come on. (Another test, turn on the AC with the fan unplugged and see if you're getting voltage at the connection.)

Take care and enjoy the ride,
Greg

 

[lextoy35]

yep, i found the pics of the fans with wires and connectors, but i was unable to find that connector inside the radaitor area of the car, any parts i need to remove to expose the wires/connectors??

 

[lextoy35]

update:
after searching around i found the diagnostic function by pushing the REST button.
got this
A/C Sensor Values:
Sensor 1: Inside temperature: 73
Sensor 2: OUtside temperature: 59
Sensor 3: Left Heater Core temp: 111
Sensor 4: Right Heater Core Temp: 112
Sensor 5: Evaporator Temp: 85
Sensor 6: Engine Coolant Temp: 187
Sensor 7: Refrigerant Pressure: 10
Sensor 8: Refrigerant Temp: 86
Sensor10: Blower control voltage: 6
Sensor20: aux fan control: 0

now when i held down the 2 AUTO buttons for 10 sec, my aux fans came on very obviously!!! loud swooshing sound and tons of air sucking into the grill!!!!
Sensor 20 went to reading 10.

so i know the fans work.
but they dont come on with the AC
or dont seem to come on when the engine gets above 85-90...

now so you know in my area it is still only in the 50's during the daytime, in the 30's at night... maybe some values are off because of that???

this morning temp outside was 35, and i checked sensor 7: refrigerant pressure, it was only 3 or 4. even with the AC on. however it was so cold outside, maybe even though i turned on the AC, it is an on demand system and doesnt truly turn on the compressor unless it needs to????
so where do i find relays to turn on aux fans with the Ac and when the engine starts to overheat???
all this keeps kicking out my CPS.
ordered one ove the weekend will install this week!!!!

 

[stim141]

First the climate control may be coded incorrectly. What are the last two readings when you press and hold the Rest buttons. Just press the left AUTO button and see codes (i think ) 45 and 44. Should be something like 160 or greater for the second to last. If its coded wrong it may not turn on the fans. If you don't know how to set the coding just ask. Did you run a climate control diagnostic? The info you posted isn't really the full diagnostic. All you are basically seeing is the sensor readings. The full diags will tell you if the freon is low or there are tons of other problems with the system. Set the left temp setting at Hi, right at low. Turn car off briefly then turn on, press and hold both the EC and REST buttons. Will enter diagnostic mode. Then press the right AUTO button. Inside fans will run high briefly then run the test. If you don't generate any codes the FF will display. Otherwise you'll see a b which really looks like a 6 followed by a set of 4 numerals. This is the actual code. If you get anything post it and I'll look it up. To get out of the diag mode just turn the car off and back on - there is no button to exit. If you want to clear any stored codes just press and hold both Auto buttons.

 

[lextoy35]

the codes i read for 40, 41, 42 , 43
havent run diagnostic yet, will do it tonight.

40: control module version menu status : 8
41: control moduleversion menu hardware status: 5
42: control module variant code 1st #: 200
43 variant code 2nd #: 14

i think the # you were referencing is #42, and my reading is 200, so looks ok.

 

[stim141]

I have a 2000 CLK430 Coupe and my codes are a little different: 160 and 8, also have used 236/8. Got the codes from AllData and it starts with a base number then you add based on equipment K1/K2 and electric cooling fans - also numbers are different for Cabriolet.

From AllData

Numerical Value

128 with Serial Interface K1
+8 with Serial Interface K2
+32 with electric Cooling Fan

Total either 160 or 168

Cabriolet is same just add 16

The P2 values I don't have or can't find at the moment


I think my car may have been programmed initially with the 200 value but the internal temps of the car NEVER were right so I changed the coding - now its always about 3-4 degrees from the dash settings as indicated by the REST readouts and the dash settings.

My cooling fans also come one when they need to.

Check the diags tonight and report back - maybe it will say something. It should also report if the coding is wrong.

 

[lextoy35]

ok
ran the diagnostic.
fans blew than cycled, red light blinking all teh time in the recirculation button up top.
an "E" appeared on teh left side of display, while in diagnostic mode,and then a few seconds it was done and read on teh right side of display...
"FF"
so no codes
seems the system is running ok??
i tried it twice.
1st time car was running, in park, turned key to off position, then restarted engine completely, then ran diagnostic.
2nd time car was running, in park, turned key to off position, then only turned key to accesory position, the "ding ding ding" fromt eh key stopped ina few seconds, then ran the diagnostic.
both times diagnostic worked the same way, and i got FF both times.
i think maybe everything is fine, except my crank position sensor is just going bad, and i'm not even close to overheating, highest temps i have seen were still below 100C.
and the aux fans only come on at 107C ????? i read that somewhere on here.
if thats the case, then they arent supposed to kick on yet.
i wonder if turning on the AC should turn on a fan or not??? below 107C
i tink after i replace the CPS this week i will have to wait till summer to see what the fans do in the heat!!!

 

[stim141]

I'll check mine today - temps in the 60's. Good news on the diagnostics at least you didn't throw a code - so your pressures and components are good. Did a quick check this morning before I left and the fans don't come on automatically when I set both sides to low. Note that the car isn't warm just started in the garage with the coolant temps low. Will see after driving a bit. In the summer they both kick on high when the temps are in the 90's after driving a while with the ac on. Think its temp sensor related not climate control related. In my VW GTI (no longer own) which only has an electric fan the fan will turn on when AC engaged on low speed. When driving it kicks up and down between low and med. Only jumps to high when temp of the coolant is high. Think thats the case with the CLK. Belt driven fan obviously runs continuously as a low fan then the electrics will kick in when the coolant temps get high. Since your gauge maybe showing high its possible that the coolant temp sensor may be going and not making contact to drive the fans earlier as spec calls for. Will check ALLData to see what are the specs today.

 

[lextoy35]

update.
installed my CPS and havent stalled since.
noticed as the weather gets warmer, my auxilliary fans are kicking on at about
207 degrees F, with the AC on. until then they dont run. i can watch the temps with the climate control diagnostic program.
so all is well with the AC performance and sensors. just a bad CPS throwing me on a quest to troubleshoot the entire system

 

[gn3]

stim141,

My fans are not kicking in and I got a code (Eb1227) from the diag. Can you look up the code for me.

Thanks

 

[gn3]

Ok, I found error B1227 to be the ext temp sensor. My ext temp appears to be accurate, can this be causing the fan issue?

 

[Pancho]

This might be the Prob.:
As another example of pointy headed Teutonic needless over-engineering, the cabin blower/fan regulator is linked to the electric fans in front of the radiator/condenser. If the cabin fan regulator is bad, then the external electric fans don't come on, and your aluminum engine overheats. Brilliant, huh? Cabin fan regulator goes, and your engine burns up. And to think, the Germans used to built war machines. I guess the French can sleep at night.

Here's a link to my website where I have a pictorial "how to".

Best of luck.

http://www.panchogun.com/FVWebPhotos/FV-Cars-CLK-Repair-Blower-Regulator-Cabin-Filter.jpg