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  #1  
Old 09-21-2008, 11:40 AM
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Climate control runs when turned off

I have a 1994 C280 with 100,000 miles on it. I took the car through a touchless carwash this morning. it was a mild morning, about 60 degrees farenheit. Since going through the wash my climate control fan is running even though the climate control is turned off. Does anyone know why that might happen?

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2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)
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  #2  
Old 09-21-2008, 11:51 AM
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Probably a bad blower regulator. Is the display active?
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Old 09-21-2008, 06:32 PM
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Yes, the display is active and works properly. I can use all of the functions of the climate control for both the automatic settings and manual settings. I can change the temperature up or down.
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2011 Mazda2
2000 E320 4Matic Wagon
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  #4  
Old 09-21-2008, 06:49 PM
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Check your owners manual for the operation of the REST function.
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  #5  
Old 09-21-2008, 07:03 PM
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Hi Steve,

It isn't the rest feature. My understanding is that rest only works when the car is turned off. In my case the climate control runs when the car is on but the climate control itself is turned off. As soon as I turn the car off, or if I just keep the key in the #1 position the fan will turn off. But as soon as the key is in the #2 (on) position, the fan runs, even with the climate control turned off. Does that point towards the blower regulator?

I do appreciate your assistance, especially taking time on a Sunday afternoon. Thank you.
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2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)
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  #6  
Old 09-21-2008, 08:04 PM
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The blower regulator is hot without the key. All it takes for it to turn on the blower is a voltage signal out of the control head or anywhere else. Some times it just thinks it is seeing control but if that was the case the key wouldn't matter.
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  #7  
Old 09-22-2008, 08:03 AM
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So does that mean you suspect a failed blower regulator?

Thanks,

Jonathan
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  #8  
Old 09-22-2008, 01:21 PM
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Since it is a simple task, I would check it out.
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  #9  
Old 09-22-2008, 01:57 PM
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Thanks Steve, I appreciate it.
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  #10  
Old 09-22-2008, 02:20 PM
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Climate control fan

jlomon;
You referr to the problem part as climate control fan. To clear things up do you mean the blower that blows air inside the car or the electric fan at the radiator? Each has a different fix.
Mike
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  #11  
Old 09-22-2008, 03:12 PM
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Quote:
Originally Posted by Mike Freeman View Post
jlomon;
You referr to the problem part as climate control fan. To clear things up do you mean the blower that blows air inside the car or the electric fan at the radiator? Each has a different fix.
Mike
Hi Mike,

I'm referring to the blower that blows air inside the car.

Jonathan
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  #12  
Old 05-11-2009, 03:30 AM
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I have actually had a similar problem with my 1998 S420 (W140 body). Last winter I went through an automatic carwash in the morning, and then drove to work. When I left work to go to lunch, the climate control blower was running, even though the car was off and all locked up. It had obviously been running for quite a long time, because the battery was almost dead...the car barely started up. After I got home and turned the car off and took out the key, I only had to sit and wait for about 45 seconds before the fan turned itself on again. When I got my head up next to the air intake vent on the top of the hood, I could hear a gurgling and bubbling sound, like one of the sprayers in the car wash had somehow aimed itself just right (or wrong) for a few seconds and forced water into a spot that it shouldn't have gone inside the air supply plenum.

I had to drive to Oregon for a 4 day trip that night, and I noticed that the air conditioner was unable to effectively dehumidify the air inside the cabin during the 5 hour drive. When I got there, I was nervous about the fan draining my battery when my car sat undriven for 4 days, especially since I was out in a very remote small town (the fan went on after I turned off the car after the long trip). I tried to pull out fuses one by one, both from the underhood fuse box and the trunk fuse box, but the blower stayed on even after I had tried every fuse! I ended up having to disconnect the battery.

When I reconnected the battery and drove back to Seattle, the problem never returned. I assume that the water that had pooled up somewhere in the underhood air supply plenum had evaporated and eliminated some kind of short circuit.

Has anyone else had this problem occur before?
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  #13  
Old 05-11-2009, 03:37 AM
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I forgot to mention that when the blower motor is running after the key is out of the car, the climate control display is completely off. If I pushed the REST button, it seemed to work correctly. Then, if I pushed REST again to turn it off, the blower would kick on again 15-20 seconds later, again with the climate contorl display off.
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  #14  
Old 07-02-2009, 10:32 AM
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Hmmm...I am experiencing the same problem on my 1997 S500 coupe. I replaced the blower regulator and everything worked fine for about two weeks. Now, I am having uncontrolled fan surges and no shut off after I turn the car off. I also replaced two of the relays that are supposed to control the blower.

Trying to figure out my next move. I need a scan tool, but I am unsure of which one will be the most useful at a reasonable price. Any help?
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  #15  
Old 07-02-2009, 06:59 PM
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Quote:
Originally Posted by Western140 View Post
I have actually had a similar problem with my 1998 S420 (W140 body). Last winter I went through an automatic carwash in the morning, and then drove to work. When I left work to go to lunch, the climate control blower was running, even though the car was off and all locked up. It had obviously been running for quite a long time, because the battery was almost dead...the car barely started up. After I got home and turned the car off and took out the key, I only had to sit and wait for about 45 seconds before the fan turned itself on again. When I got my head up next to the air intake vent on the top of the hood, I could hear a gurgling and bubbling sound, like one of the sprayers in the car wash had somehow aimed itself just right (or wrong) for a few seconds and forced water into a spot that it shouldn't have gone inside the air supply plenum.

I had to drive to Oregon for a 4 day trip that night, and I noticed that the air conditioner was unable to effectively dehumidify the air inside the cabin during the 5 hour drive. When I got there, I was nervous about the fan draining my battery when my car sat undriven for 4 days, especially since I was out in a very remote small town (the fan went on after I turned off the car after the long trip). I tried to pull out fuses one by one, both from the underhood fuse box and the trunk fuse box, but the blower stayed on even after I had tried every fuse! I ended up having to disconnect the battery.

When I reconnected the battery and drove back to Seattle, the problem never returned. I assume that the water that had pooled up somewhere in the underhood air supply plenum had evaporated and eliminated some kind of short circuit.

Has anyone else had this problem occur before?
I experienced the same issue after driving in a bad rainstorm and apparently getting water in to plenum air supply.

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