i searched, no definitive answer. A/C not cold on drivers side.

hkp

Member
:
cx-9
I searched, nobody really answered the question, A/C blows cold on passengers and rear but not on drivers side. 2007 Mazda CX9 GT.
 
My only two guesses are:
1) Dual climate is not set to a cold temperature on the driver's side
2) something in the system is not reading the adjustment when you turn the dial.

I'm sure you have checked 1.
 
just in case that gets erased, here is what was suggested.

"From my experience two things would cause this condition, One of them which is easier to check is low freon level, Due to the design of the dual climate control system this has become an increased concern about uneven cooling and alot of people will say what i'm saying doesn't make sense but experience pays and I'm telling you that this is where I start to check, If you have the equipment you may recover the freon from the vehicle and compare it to total capacity, If it's less then recharge the system with the correct amount and see if you still have a difference in temperature. If the recovered amount was the same as the total capacity of the A\C system then I would start looking into possible driver's side mode servo not working properly, What a servo is the motor that changes the temperature door from hot to cold, in the dual climate control there are two of these mode servos one for each side, If the driver's side servo is not moving it's door to fully cold then it will mix hot and cold and therefore push warm air.

To summarize I would start by checking the freon level, doing this will require an a\c machine to check the pressures and recover\recharge. If the freon level was low then a visual inspection will need to take place to see if you have a leak, A common place to leak is the condenser which is basically the radiator for the a\c system which is behind the grille at the front of the vehicle and is common to get hit by a rock from the street and leak out. usually you will see the leak on the condenser as a wet area or an area with unusual accumulation of dirt and dust due to the oil in the a\c system leaking out and attracting dirt.

If the A\C charge was good then the diagnosis will take a sharp turn into the complicated servos which at this point I highly suggest visiting your local Mazda dealership for repair since these servos are usually buried under the dash and are extremely complex to diagnose and use of their scan tool will help greatly in diagnosis."




the guy took it to the dealership and they recovered the freon and charged the system, the guy said his issue was fixed.

I guess it could be the problem, I had the transfer case and trans replaced so maybe they opened the system. I will throw gauges on it the next time it warms up and report back. thanks for the link dude.
 
So it was indeed low charge in the system. So now people know, with low charge, the a/c will blow cold on the passenger and rear, but not the drivers side.
 
So it was indeed low charge in the system. So now people know, with low charge, the a/c will blow cold on the passenger and rear, but not the drivers side.

thanks for the update @hkp! That is good to know for future diagnosis.
 
I have the same problem in my 2007 CX-9 Grand Touring with 260K miles. I can see the actuator motor adjusting the levers on both driver (under dash next to radio) and passenger side (next to glovebox).

I took it to the dealership and they said I need a new heater box HVAC assembly to fix a stuck flap door inside the assembly, behind the dashboard. They quoted $3,900 to repair. I am thinking about taking dashboard off myself and removing this assembly to see if anything is stuck. The low A/C charge doesn't make much sense to me. If the rear and passenger blow cold, why would the drivers side be luke warm?

I am going to try the A/C charge to see if it fixes my problem. If it doesn't, I am stuck going into the dash. I'll let you know. Thanks to all of the contributors.
 
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I have the same problem in my 2007 CX-9 Grand Touring with 260K miles. I can see the actuator motor adjusting the levers on both driver (under dash next to radio) and passenger side (next to glovebox).

I took it to the dealership and they said I need a new heater box HVAC assembly to fix a stuck flap door inside the assembly, behind the dashboard. They quoted $3,900 to repair. I am thinking about taking dashboard off myself and removing this assembly to see if anything is stuck. The low A/C charge doesn't make much sense to me. If the rear and passenger blow cold, why would the drivers side be luke warm?

I am going to try the A/C charge to see if it fixes my problem. If it doesn't, I am stuck going into the dash. I'll let you know. Thanks to all of the contributors.

I just got an A/C recharge for $49.99 and it fixed the problem. For some reason when the refrigerant starts running low the drivers side vents are the ones that blow warm. As long as there is no leak, I am golden. I can't believe the dealership did not know this!
 
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