Compressor/Auxillary Fans not working
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 70
Likes: 3
From: SW FL
2000 E 430
Compressor/Auxillary Fans not working
I recently bought an E 430. When I turn on the a/c, the compressor comes on but the condensor fans do not come on. The interior fan which is set for auto blows out cool air but not cold air. I had the veh at a friends shop and he ensured that the system was charged properly and didn't have any leaks. I think it could be a relay, sensor or controller but I have not idea where to start. Any suggestions?
Member
Joined: Feb 2009
Posts: 111
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98 e320
There is an awesome web site that will do the diagnositics for you, provided you obtain the error codes.
First, go to this web site to get instructions on how to obtain the fault codes:
http://www.eclassbenz.com/node/27
Then, plug in the values here:
http://www.eclassbenz.com/acdiag<!-- google_ad_section_end -->
The web site will tell what is wrong with your AC.<!-- / message --><!-- sig -->
First, go to this web site to get instructions on how to obtain the fault codes:
http://www.eclassbenz.com/node/27
Then, plug in the values here:
http://www.eclassbenz.com/acdiag<!-- google_ad_section_end -->
The web site will tell what is wrong with your AC.<!-- / message --><!-- sig -->
Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
Suspect you mean the Aux fans in front of the radiator.
They will come on when coolant temps reach 95c at idle, about the same time the fan clutch locks up. They howl so when they're on you'll know it.
They should not come on everytime the AC is turned on.
Unless your firend evacuated the system and then refilled it he has no way of knowing if it is correctly filled.
They will come on when coolant temps reach 95c at idle, about the same time the fan clutch locks up. They howl so when they're on you'll know it.
They should not come on everytime the AC is turned on.
Unless your firend evacuated the system and then refilled it he has no way of knowing if it is correctly filled.
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 70
Likes: 3
From: SW FL
2000 E 430
usaims, went to the site and ran the check for codes. They were b1234, b1422 and b1424. The latter 2 have no explanation on that website. b1234 means that the sensor in the middle of your dash for sunlight isn't working properly but this doesn't affect the performance of the a/c. Thanks for your imput.
Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
I think almost every W210 ever made has code B1234 fault.
B1422 Series interface (K1) connection to instrument cluster (A1)
B1424 Activated charcoal filler actuator (A32m2) open
My AUX fans only come on when its 100f and I exit the freeway into stop and go city driving. Coolant temp usually spikes and fans activate when ideling. Note the idiot gage on the dash is designed to go to 95C and hold that temp (even though real temp is rising) until coolant temp reaches 105C when it begins reporting accurating again. You can see this by observing coolant temp using the CCU screen while driving.
B1422 Series interface (K1) connection to instrument cluster (A1)
B1424 Activated charcoal filler actuator (A32m2) open
My AUX fans only come on when its 100f and I exit the freeway into stop and go city driving. Coolant temp usually spikes and fans activate when ideling. Note the idiot gage on the dash is designed to go to 95C and hold that temp (even though real temp is rising) until coolant temp reaches 105C when it begins reporting accurating again. You can see this by observing coolant temp using the CCU screen while driving.
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Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
Got me......I just know what they are.
Guessing I'd suspect the 1422 might have been a low voltage situation where the CCu lost communication? Any batt probs in the the past?
1424 is the Recir button on? Filter been changed recently? Any vacuum pod issues witht the AC? Checked the recir vent door to see if it is stuck open?
I'd prob clear all of them and then check it again after running it with AC on a few hours and go from there.
If it won't blow cold, post your actual values. AC set tp auto and 72F, fully warmed up. The AUX fans have little to do with that right now, unless you are located in a desert and its over 100f today.
Guessing I'd suspect the 1422 might have been a low voltage situation where the CCu lost communication? Any batt probs in the the past?
1424 is the Recir button on? Filter been changed recently? Any vacuum pod issues witht the AC? Checked the recir vent door to see if it is stuck open?
I'd prob clear all of them and then check it again after running it with AC on a few hours and go from there.
If it won't blow cold, post your actual values. AC set tp auto and 72F, fully warmed up. The AUX fans have little to do with that right now, unless you are located in a desert and its over 100f today.
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 70
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From: SW FL
2000 E 430
sorry #1 is 71 #2 is 64, #3 is 75, #4 is 73, #5 is 73, #6 is 197, #7 is 05 and #8 is 89. Error codes wer b1234, b1422, and b1424. I will check to see how to clear them. I am used to American Vehicles where the aux fans come on when you turn on the a/c. My fans don't come on probably due to the weather. My compressor comes on and stays on but I don't feel any cold air when I turn it to LO. Thanks!
Member
Joined: Feb 2009
Posts: 111
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98 e320
usaims, went to the site and ran the check for codes. They were b1234, b1422 and b1424. The latter 2 have no explanation on that website. b1234 means that the sensor in the middle of your dash for sunlight isn't working properly but this doesn't affect the performance of the a/c. Thanks for your imput.
Member
Joined: Feb 2009
Posts: 111
Likes: 0
98 e320
sorry #1 is 71 #2 is 64, #3 is 75, #4 is 73, #5 is 73, #6 is 197, #7 is 05 and #8 is 89. Error codes wer b1234, b1422, and b1424. I will check to see how to clear them. I am used to American Vehicles where the aux fans come on when you turn on the a/c. My fans don't come on probably due to the weather. My compressor comes on and stays on but I don't feel any cold air when I turn it to LO. Thanks!
Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
Ambient temp was lower than the CCU temp setting. No cooling was taking place.
Try again when it warms up some.
I believe you depress both auto buttons 3-5 secs to erase the codes. I'll check at home tonight if that is incorrect. FF means end of/or no codes.
Try again when it warms up some.
I believe you depress both auto buttons 3-5 secs to erase the codes. I'll check at home tonight if that is incorrect. FF means end of/or no codes.
Last edited by TMAllison; Mar 30, 2009 at 01:02 PM.
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 70
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From: SW FL
2000 E 430
I'll take it back to the shop. The self diagnosis states that pressure is low due to not enough r134. My friend/mechanic is from the old school. He may have not have put enough in. He says that he goes on pressures. I read that the pressure in this system is variable and you must have the right amount of coolant to begin with. TM if you find out how to clear the codes let me know, thanks.
Super Member
Joined: Jun 2008
Posts: 835
Likes: 2
From: Bay Area, CA
09' E320
Hold both auto buttons to clear codes while viewing the codes.
The only way to know for certain it is properly filled is to evacuate and refill. It is variable.
If its low you will usually hear a hiss or zinging sound from the center vents.
The only way to know for certain it is properly filled is to evacuate and refill. It is variable.
If its low you will usually hear a hiss or zinging sound from the center vents.
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Joined: Feb 2009
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98 e320
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 70
Likes: 3
From: SW FL
2000 E 430
Today I cleared the codes, vacummed down the system and refilled it. The 134 I used also has a leak detection chemical in it. I suspect the system has a leak under pressure and not vacumm and that's why I had this problem in the first place. The a/c works fine for now. The auxillary fans did come on too. THanks for you imputs!
Member
Joined: Feb 2009
Posts: 111
Likes: 0
98 e320
Today I cleared the codes, vacummed down the system and refilled it. The 134 I used also has a leak detection chemical in it. I suspect the system has a leak under pressure and not vacumm and that's why I had this problem in the first place. The a/c works fine for now. The auxillary fans did come on too. THanks for you imputs!
