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Climate Blower Motor Turns On After Car is Shut Off

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GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Climate Blower Motor Turns On After Car is Shut Off

 
Old 02-06-2019, 08:34 PM
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Heater A/C Blower Motor Turns On After Car is Shut Off

The climate blower motor starts running on high blowing cold air after the car is shut off. Locked or unlocked it keeps running non stop. While the car is running everything is working fine. Help please?

Last edited by Dinismb; 02-06-2019 at 10:17 PM.
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Old 02-06-2019, 09:26 PM
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Anyone?

Last edited by Dinismb; 02-07-2019 at 10:46 AM. Reason: Delete
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Old 02-10-2019, 02:21 PM
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Originally Posted by Dinismb View Post
Anyone?
I would bet you have the "Rest" feature on, which allows the climate control fan to run for up to 30 minutes after you turn the car off. It os a feature to help keep the interior conditioned if you are just running into a store for a short period of time. When you turn the car off, see if the REST light is illuminated (on the a/c controls). If so, just press the rest button and it should turn off the feature.
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Old 02-10-2019, 04:58 PM
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Originally Posted by ccrobin View Post
I would bet you have the "Rest" feature on, which allows the climate control fan to run for up to 30 minutes after you turn the car off. It os a feature to help keep the interior conditioned if you are just running into a store for a short period of time. When you turn the car off, see if the REST light is illuminated (on the a/c controls). If so, just press the rest button and it should turn off the feature.
I doubt its that becuase it ran for about 3 hours before I noticed. Then the second time around I left it intentionally to replace it.

However, after I worked around, I found that either the resistor or the blower motor is bad. So I ordered a new one which the resistor is build into the blower fan.

I should get it tuesday and see if i am in luck.
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Old 02-11-2019, 02:03 PM
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There is another thread on here somewhere about this topic. I have found my HVAC blower running occasionally after I left the car.

I believe that the answer was that the system is designed to run a little bit after the car is shut off to avoid mold/mildew in the cabin filter and this was due to customer complaints about smells.
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Old 02-11-2019, 06:34 PM
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Sounds like you might already have things figured out. I can't offer any more help than what you probably already know, but is there a relay for the blower motor? It sounds like a classic symptom of a stuck relay. BUT... maybe it's built into the motor assembly? I don't know that answer - just that maybe with some research/googling/checking fuse & relay diagrams, you can see if it would end up being a simple $15 relay.
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Old 02-11-2019, 08:45 PM
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Originally Posted by DennisG01 View Post
Sounds like you might already have things figured out. I can't offer any more help than what you probably already know, but is there a relay for the blower motor? It sounds like a classic symptom of a stuck relay. BUT... maybe it's built into the motor assembly? I don't know that answer - just that maybe with some research/googling/checking fuse & relay diagrams, you can see if it would end up being a simple $15 relay.
funny enough i cant find the relay from the fuse diagram. I did find the main 40 amp fuse which is besides the battery in the battery compartment.

I will find out tomorrow when I get the new blower fan. Also, i was trying to find the resistor and little did i know that the resistor is built into the motor.

i will let you guys know tomorrow when I put in the new motor
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Old 02-11-2019, 08:47 PM
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Originally Posted by DE_Bag View Post
There is another thread on here somewhere about this topic. I have found my HVAC blower running occasionally after I left the car.

I believe that the answer was that the system is designed to run a little bit after the car is shut off to avoid mold/mildew in the cabin filter and this was due to customer complaints about smells.

i did go through the forums and i did run across it. However, my symptos are that it doesnt stop at all which for test purposes i did leave it running until i decided to pul the wire so it doesnt drain the battery.
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Old 02-13-2019, 05:57 PM
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This happens on our 2010 GL450 alot. I'm convinced that it's intentional - maybe used to dry out the air box. For us, the blower has kicked on 30-45 minutes after the truck was turned off and locked, with no keys in the vicinity. It has never caused an issue with the battery though.
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Old 02-13-2019, 09:32 PM
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My 2011 GL350 does this also. I went out to the garage one night to get something and heard a fan running. Snooping around I heard the sound coming from the grill on the hood (passenger side). Fan was running at slow speed. I am wondering if it is drying the evaporator out to keep an odor from forming? I live in a hot climate, so using the AC alot.
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Old 02-13-2019, 11:03 PM
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There is a setting in the AAC to run the fan to dry the evaporator off after the veh has been shut down for a while, it's supposed to be to prevent the moldy smells they get.

If you have the a/c off when you turn the truck off it shouldn't happen. But it's on purpose. Not for 3 hours though, that sounds bad.
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Old 02-14-2019, 01:01 AM
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Ok everyone problem solved. I just installed a new used oem blower motor and everything is ok. I did open the old one and the resistor was dry but did seem to have had dry residue from moister.
Everything is fine now. So if youre experiencing the same symptoms open up the blower motor and check out the resistor. Unlike the Audi/VW where the resistor is separate, in the GL its built in/ part of the motor.

If you need instructions on how to get to it I can take some pictures but its fairly easy to do.
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