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Mazda CX-9 Heat and Air Conditioning

73 messages,  Last post on May 24, 2012 at 8:02 AM

You are in the Mazda CX-9 Forum.

What is this discussion about? Mazda CX-9, Heating / Cooling, SUV

    

Messages Page 4 of 8

#31 of 73 Re: air conditioning stays on when car is off [bigdog19] by imamg

Nov 02, 2009 (5:21 pm)

Replying to: bigdog19 (Oct 28, 2009 4:04 pm)
There is a window of time that allows you to still use the windows, this is normal... the ac/ staying on after the car is turned off is not normal...and there's a known issue with it. There's a relay that hangs open too long. Ask your dealer about it. It's not a difficult repair.

#32 of 73 Re: air conditioning stays on when car is off [bigdog19] by 08mazdaowner

Dec 02, 2009 (12:44 pm)

Replying to: bigdog19 (Oct 28, 2009 4:04 pm)
I have a 2008 CX9 and took my car in today as it was doing the same thing...it's the relay switch and they are charging me $149 to fix it...I wish I had researched it more before paying so much!!! If you are past the 36k warranty, it's not covered...

#33 of 73 Re: air conditioning stays on when car is off [08mazdaowner] by vg33e power

Dec 02, 2009 (1:14 pm)

Replying to: 08mazdaowner (Dec 02, 2009 12:44 pm)
WOW! $149 to open hood, pop off relay box lid, remove both front and rear blower relays, install 2 X $20 relays, snap relay box lid back on, close hood and voila!!

#34 of 73 Re: air conditioning stays on when car is off [vg33e power] by ceric

Dec 02, 2009 (2:31 pm)

Replying to: vg33e power (Dec 02, 2009 1:14 pm)
There is a reason why knowing your vehicle costs you much less in maintenance.
If the same had happened to me, I would read the TSB first, and try it fix it myself if my CX9 was out of warranty.
 
Another thing people should consider is it to call MazdaUSA corporate. If you argue your case calmly, Mazda could pay for the parts, and you pay for the labor cost. It helps, but not entirely. This is especially true when your CX9 is barely beyond 36K miles.
 
Anyway, early models (2008) have more problems (already better than 2007).
Buying a 2010 model should be a much safer decision.
 
I personally am not aware of any vehicle that is problem-free. My co-worker's Lexus RX330 already had two stall issues. That is a much bigger problem than the A/C staying on. You got stranded for THAT. And, yet, he seems to still love
his "reliable" Lexus. Go figure.

#36 of 73 2008 CX9 clogged AC evaporator - wet mat by coachiz

Jul 25, 2011 (4:26 am)

I've already had the phantom "blower comes on after turning off the vehicle" problem. The dealer replaced the front blower relay (#G11567730 MSRP $15.36) in warranty & now the rear blower relay intermittently does the same thing now that the vehicle is out of warranty - make sure you have the dealer replace both if the vehicle is in warranty - live & learn from my mistake.
  
The new problem is in the AC but is totally separate of the relay problem. After many days of 90 degree weather & constantly running the AC, I began to hear a swishing sound under the dash. On left turns, the swishing sound would be accompanied by a fan & swish sound like a boat propeller entering the water. After a few days, the noises were accompanied by moisture on the passenger mat & all around the underside of the dash. After reading many posts, I determined I had a clogged AC evaporator tube. I found the tube outlet under the vehicle & blew out the obstruction with an air compressor hose. The water caught in the evaporator came gushing out. The good news is that I cleared the obstruction - the bad news is that during this entire process, my front blower has stopped working while the rear blower continues to work. The AC is working but you have to sit in the back to stay cool. I checked the relay to see if that may be the problem but it wasn't. I checked all fuses related to the front blower but they're all good.
  
Has anyone had this problem - I'm guessing I may have fried my blower motor but I want confirmation & history before I rip my dash apart?
  
Please help!!!

#37 of 73 Re: 2008 CX9 clogged AC evaporator - wet mat [coachiz] by wwest

Jul 25, 2011 (9:47 am)

Replying to: coachiz (Jul 25, 2011 4:26 am)
"..blew out the obstruction..."
 
No, you blew the "obstruction" (mouse nest??) BACK into the A/C plenum area where it is blocking the blower from turning.

#38 of 73 Re: Rear air in 3rd row [maltb] by wwest

Jul 25, 2011 (9:55 am)

Replying to: maltb (Sep 12, 2008 1:54 pm)
For many of us, maybe even the clear majority, DRY and COOLISH airflow continuously directed to the face and upper body can be discomforting, VERY discomforting. So I often override the automatic functionality and re-route cooling airflow to the footwell vents.
 
The above is especially true when the human comfort equation tilts to the heating side, COLD surrounding outside landscape, and the system still INSISTS on routing cool and DRY airflow to the face and upper body.
 
NipponDenso, Denso US, IDIOTS ALL...!!

#39 of 73 Re: Rear air in 3rd row [maltb] by wwest

Jul 25, 2011 (10:09 am)

Replying to: maltb (Sep 12, 2008 1:54 pm)
"..let's discuss how effective floor vents are for the perceived cooling of the vehicle.."
 
And now let's broaden the discussion....
 
Yes, our "perception" of rapid cooldown of the vehicle is heavily influenced by the boundiful level of cool and dry airflow that is automatically routed to our face and upper body in cooling mode. BUT ONLY IN COOLING MODE.
 
What about when the human comfort equation has tilted toward the need for HEATING, the surrounding landscape is COLD, and these systems still go into COOLING mode, coolish and DRY system airflow from the dash outlets.
 
It is at those times, mostly, that the system needs to remain in, switch into, footwell airflow outlet mode.

#40 of 73 Re: Rear air in 3rd row [ceric] by wwest

Jul 25, 2011 (10:15 am)

Replying to: ceric (Sep 12, 2008 6:20 pm)
"..I have a hard time believing it..."
 
Believe it...!
 
Most modern day climate control systems when in automatic mode and the cabin temperature is with a few degrees of system setpoint will ONLY route airflow via the dash outlets. (Doesn't mean you can't override it.)
 
If you look at the internal design of the A/C plenum area, blower, evaporator and heater core placement, you can easily see that it was designed primarily for dash outflow, "cooling" mode.

Messages Page 4 of 8

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