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Unread 06-26-2012, 12:44 AM   #1
htorrescompass
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2010 Compass A/C blower runs again after key taken out

I noticed this problem when my battery was dying. I have it recharged.
So I turned off the engine, key is out but the AC knob in on, let's say, on second speed. Ok the AC stops after switch is off, key out. But I stayed in the car and after 30 seconds, the blower suddenly turns on, i feel the air coming out thru the vents, o course it's draining my battery.
If I leave the speed knob off, nothing happens after the 30 seconds, so we're safe if we don't forget to turn of the AC before turning off the engine and before leaving the car
It's my wife's 2010 Jeep Compass, so problem is that it's the second time she has forget to switch the knob off, causing the death of the battery overnight. I'm really sick about this problem and I don't want to take the Compass to the stealership. Can somebody tell if there is DYI to fix this?


Last edited by htorrescompass; 06-26-2012 at 02:43 AM..
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Unread 06-26-2012, 07:01 AM   #2
JeepCares
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I know you don't want to hear this, but a dealership is probably your best bet. I'm also working under the assumption that the vehicle is still under warranty.

I'm thinking you might need a scan tool to properly diagnose it, but someone out there might have some ideas.
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Unread 06-26-2012, 08:34 AM   #3
Gramps
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It sounds like you have a short to voltage in a connector or in the wiring. Check for chafed wires or a problem with a connector. Those are the most likely problems but diagnosis also calls for replacing the instrument panel. An Auto Parts store can pull the codes for you to help isolate where the problem could be.
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Unread 06-26-2012, 08:40 AM   #4
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I know on some vehicles if the temps are still hot enough,from say running the AC on a 100 degree+ day,the fans can start on there own even with the engine turned off to keep the coolant temps down.I do not know if the compass is one as I don't have the FSM to check.
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Unread 06-26-2012, 11:40 AM   #5
htorrescompass
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I bought this car at a Jeep dealer on December 2011 with 36K. It was a "Certified" car and came with 3 moths bumper to bumper. On February, still under that warranty, I noticed that the AC blower wasn't working at all speeds, the higher ones. On my invoice they stated that it was caused by a bad switch and it was replaced. Note says: Installed 55111132AD : control : A/C and Heater Diagn. AC Control Hed (1@$70.77 + Labor $79.80).
This job was performed on 2/20/2012.
I wonder if the current problem it's related with the switch installed, maybe a bad installation, connection or switch malfunction on this job?. Invoice doesn't say anything about how much warranty I have on this job.
As for the one saying that fans can run on their own, yes, in Arizona the high temperatures are currently above 110, but I don't think the fan starts to with engine turned off to keep coolant temps down all night long draining the battery, specially since during the night temps are below 100.
Helppp!!!
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Unread 06-26-2012, 12:13 PM   #6
tjkj2002
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Quote:
Originally Posted by htorrescompass View Post
I bought this car at a Jeep dealer on December 2011 with 36K. It was a "Certified" car and came with 3 moths bumper to bumper. On February, still under that warranty, I noticed that the AC blower wasn't working at all speeds, the higher ones. On my invoice they stated that it was caused by a bad switch and it was replaced. Note says: Installed 55111132AD : control : A/C and Heater Diagn. AC Control Hed (1@$70.77 + Labor $79.80).
This job was performed on 2/20/2012.
I wonder if the current problem it's related with the switch installed, maybe a bad installation, connection or switch malfunction on this job?. Invoice doesn't say anything about how much warranty I have on this job.
As for the one saying that fans can run on their own, yes, in Arizona the high temperatures are currently above 110, but I don't think the fan starts to with engine turned off to keep coolant temps down all night long draining the battery, specially since during the night temps are below 100.
Helppp!!!
When you 1st turn off your engine after running it for sometime with the AC on in 100 degree+ weather your coolant will continue increase in temp since it's not flowing(only slowly by thermal something or another but not very fast) and nothing is aiding it to cool.Some vehicles take that into account and will run the fan after the engine is shut down.Why you see warnings on electric fans under hoods that state "Caution fan may start at anytime".Very common on Fords and honda's for them to keep the fans on after engine shutdown for a few mins.
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Unread 06-26-2012, 03:26 PM   #7
Gramps
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The radiator fans running after the engine is powerd down I can understand but not the A/C blower fan.
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Unread 06-26-2012, 03:54 PM   #8
dirkdiggler106
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Quote:
Originally Posted by Gramps View Post
The radiator fans running after the engine is powerd down I can understand but not the A/C blower fan.
+1 Sounds like a short or bad switch to me.
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