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fah014 04-15-2010 06:15 AM

I need help with my grand cherokee 2002
Hello to all members, I need your help with my wj 2002, when i turn on the air conditioning not cold out, and the gas and the compressor is fine , i have seen that the fan does not spin fast and is only on low speed, i think that could be valve of the hidrulic oil that does not move position, it will be possible that this damaged,

thanks for your help :thumbsup:

StoneCold 04-15-2010 06:35 AM

Re: I need help with my grand cherokee 2002
Blower motor resistor/ blower motor possibly? How much air is coming out of the vents? Can you smell coolant?

Chaoul1 04-15-2010 09:32 AM

Re: I need help with my grand cherokee 2002
You sure there isn't a refrigerant leak? (It's not gas lol)

fah014 04-16-2010 12:40 AM

Re: I need help with my grand cherokee 2002
thaks, for your post, and the fan is not electric is hidraulic, and there are no leaks in the system, I have seen that the fan does not start in high speed only in low speed, and air vents is not cold, i think the problem is the fan that does not start at high speed i'm right or not....

Frango100 04-16-2010 08:26 AM

Re: I need help with my grand cherokee 2002
Talking about the hydraulic fan, that one has nothing to do with the airco system. It indeed runs slowly at idle to keep a minimum hydraulic flow in the system (100-500 rpm), but it revs up when engine temp gets high. The airco fan is in front of the radiator and is electrical. Does your WJ have the digital or analog airco system:confused:

Frango100 04-16-2010 10:08 AM

Re: I need help with my grand cherokee 2002
Sorry guys, made a mistake, when you have the hydraulic fan, than there´s no more electric fan in front of the radiator.
But low airconditioning performance can have many causes.
First of all, do you have normal airflow from the air outlets when not using the airco?
When you have the digital airco, see below for the procedure of retreiving fault codes.

To enter the AZC self-diagnostic mode, perform the
(1) Depress the a/c and recirc buttons at the same
time and hold. Rotate the left temperature control
knob clockwise (CW) one detent.
(2) If you continue to keep the a/c and recirc buttons
depressed, the AZC control module will perform
a Segment Test of the Vacuum Fluorescent (VF) display.
In the Segment Test you should see all of the
display segments illuminate as long as both buttons
are held. If a display segment fails to illuminate, the
vacuum fluorescent display is faulty and the a/c
heater control must be replaced.
(3) After viewing the Segment Test, release the
A/C and Recirc buttons and the display will clear
If a 0 is displayed, then no faults
are set in the system.
Should there be any faults,
"current" or "historical", all fault codes will be
displayed in ascending numerical sequence (note no
effort is made to display fault codes in chronological
order). Each fault code is displayed for one second
before the next code is displayed. Once all fault codes
have been displayed, the system will then repeat the
fault code numbers. This will continue until the left
side set temperature control is moved at least one
detent position in the CW direction or the ignition is

turned "

If you find any code, let me know and i can find the corresponding fault.

The analog system i´m not familiar with, only know that it uses blend doors which use vacuum from the engine for operation.

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