No Moving Air but Fan is on - Mercedes-Benz Forum
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post #1 of 31 (permalink) Old 03-20-2018, 02:42 PM Thread Starter
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No Moving Air but Fan is on

Hi all.

I'm having this weird issue with my 2005 Clk500. Start the engine, the the blower at maximum and I can hear the blower loud and clear but then there's no air and ac. I checked the fuse, 41 and 51, I think. All are good. I'm guessing that I'll need to recharge the coolant but then why the air is not moving even though the fan sounded very clearly. Is there anything else I can check or y'all can suggest? I'm hoping it's not the blower motor or something hard or expensive to fix. 🤞. Please advise?

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post #2 of 31 (permalink) Old 03-20-2018, 05:34 PM
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Deflectors? Air diverter or whatever you call them. Are you getting any flow from the defroster? Leg area? Remove the cabin filter housing, have someone rotate the climate control knob and watch if the flapper is moving. When you remove the cabin filter housing, you'll see the blower motor as well and right above it, you should see the diverter door. I have the same issue. Need to remove the dash and replace the...the....whatsyoumacallit....thingamajig....Ru deney...chim in...for that part name....

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post #3 of 31 (permalink) Old 03-20-2018, 05:48 PM
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Try the ACC test/reset: engine running, simultaneously press and hold the FRONT DEFOG and RECIRC buttons. Release them once their indicator lights begin to flash. The lights will flash for 20-30 seconds as it test the system. If it stops, the ACC sees everything as functional. If not, shut the engine off to stop the test, and get a proper diagnostic run on the ACC (use iCarsoft, Autel or SDS - generic OBDII scanners won't do it).

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post #4 of 31 (permalink) Old 03-20-2018, 11:12 PM Thread Starter
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Benica. Yes, I got some air flow from the bottom and defroster although not a strong wind even after I turn the blower to the max and the fan sounds normal max fan. What you just explained make sense. Now I just have to open the air filter and do what you said.

Rudeney, I'll try your method as well. So far aside from whatever that item is that redirect the wind, I got the feeling the refrigerant may be finished already since I only feel hot air even though the actual is set at low temperature. Unless if the air is not moving the cool air by design is not supposed to be cooking. Damn it, hopefully not an expensive project.

I'm curious how hard is it to recharge the refrigerant gas?

I love this car very much but with the age the cost to fix this and that starting to creep up. SMH.

Benica, how much does it cost you to fix that item(whatever you call that). Just curious. But I still need to know what is the name of the item so if it's broken, I may need to order it.

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post #5 of 31 (permalink) Old 03-21-2018, 03:55 PM
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Info I received is: to replace either servo or linkage arm requires removing the entire dash.
Servo controls the doors to open and airflow to divert where you want it.
The servo from what I have found out is around $100.00 or so. Inexpensive. Labor is what kills You! $1000.00!!
I will buy the WIS and get the instructions and do it myself. Figure it will take the shop 2 days....I am in no hurry and will work on it leasurly. If it takes a week. No problem.

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post #6 of 31 (permalink) Old 03-23-2018, 03:19 AM
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Take a look at the airflow diagram below. It is from a W220 document, but is the same for your W209 CLK.

Note the two sets of filters: item 20 - dust filters, item 22 - activated charcoal filters. Remove the filters and check if the airflow is improved. If so, replace them.

Also, item 1 (fresh air flap) could be toast.
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File Type: pdf W209 a-c system airflow diagram.pdf (129.1 KB, 29 views)
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post #7 of 31 (permalink) Old 03-31-2018, 10:16 PM Thread Starter
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Thanks Benica and keyhole. I'm going to try it tomorrow Sunday afternoon. Open the filter and see how bad it is. Also I finally got the refrigerant. So I'm going to charge it and see whether that helps. Thanks everyone. You've been very helpful..

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post #8 of 31 (permalink) Old 04-01-2018, 05:46 PM Thread Starter
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Well I tried to recharged the refrigerant thinking that it's low. Nope. Plug it in the first time, pressure is acceptable but I tried to add the refrigerant anyway. Finished 1 14 oz bottle and still warm air. Removed the cabin air filter. The wind is blowing through that empty slot where the filter was but nothing passed through the rest of the blow hole. And under the dash driver side still blowing warm air even though the actual is running full force. Tried the auto air and that kicked off the compressor (I think) coz the engine sounds louder but still warm air. So I'm guessing it's the flap/damper that's an issue. What's your guys thoughts? I tried Rudeney's suggestion with the test, I hold the two button for like 1 min and it didn't even blink to run the test. So I'm not quite sure what else to try. So frustrated. SMH... Any suggestion as the next step?

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post #9 of 31 (permalink) Old 04-01-2018, 05:59 PM
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You may need to scan codes form the ACC to see what you have. A generic OBDII reader won't do it - you need one that reads MBZ's proprietary systems.

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post #10 of 31 (permalink) Old 04-02-2018, 10:15 AM Thread Starter
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Thanks Rudeney. I wonder whether company like AutoZone or O'Reilly has it and can loan it really quickly to me.. hmm..

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