Rear air conditioning better than the front

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Mazda cx-9 2008
Thanks for the information. In the topic above there is a link where the service is and there is one expansion valve in the diagram. I don't see the other.
 
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Mazda cx-9 2008
If there are two evaporators, there will be two expansion valves. The suction tube (large)
should be cold coming out of each evaporator.
number 1. Expansion valve. there is one, I cannot see the other.
 

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17 CX-9 GT FWD
Thanks for the information. In the topic above there is a link where the service is and there is one expansion valve in the diagram. I don't see the other.
Just looked at Rock Auto parts. They list both a front and rear expansion valve with different part #'s
 
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Mazda cx-9 2008
Air conditioning service indicates that the evaporator or its connections are leaking. I will disassemble the dashboard myself. Does anyone have videos of such work? any hints?
 
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17 CX-9 GT FWD
Air conditioning service indicates that the evaporator or its connections are leaking. I will disassemble the dashboard myself. Does anyone have videos of such work? any hints?
As both the front and rear evaporators operate off the same refrigerant system, it is important to identify the area of the leak to reduce your disassembly time. If rear was cooling well are you sure there is a leak?
 
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Mazda cx-9 2008
A few days ago, the back stopped cooling. 50gr r134a left. The sensor shows r134a in the front air vents. Diagnosis of leaky evaporator. I don't know if the O-rings are leaking or the evaporator is leaky. I have to take the cockpit down. A lot of work. I am also thinking to give a sealant for the air conditioning system? What do you think?
 
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17 CX-9 GT FWD
A few days ago, the back stopped cooling. 50gr r134a left. The sensor shows r134a in the front air vents. Diagnosis of leaky evaporator. I don't know if the O-rings are leaking or the evaporator is leaky. I have to take the cockpit down. A lot of work. I am also thinking to give a sealant for the air conditioning system? What do you think?
My profession is automotive air conditioning. If sensor is picking up R134A in front vents,
most likely a leaking coil rather than o-rings. If you are selling the car soon, give the sealant a try. If you are planning to have the car over a year, replace the coil. sealants can lead to other issues.
 
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17 CX-9 GT FWD
Sealants work by hardening when exposed to air. During a leak as the gas escapes, it hardens (seals) at the point of exit sealing the leak. If your system is not evacuated properly and contains some air after adding sealant, bad things can happen. Also in the future if the system is opened to replace a component, when the oil is exposed to air it can cause
serious issues going forward.
 
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Mazda cx-9 2008
Today I wanted to pull out the evaporator. Failed to. A lot of work. I removed the cockpit and got to the heater. To remove the heaters, unscrew the metal beam. There is a screw on one side and 3 square screws from the driver. They are welded together. I don't know how to unscrew them
 

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