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  #1  
Old 08-26-2014, 12:32 PM
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AC Problems 2002 Laredo

I have a 2002 Grand Jeep Cherokee Laredo I purchased in Feb. 2014 which has not blown cold only cool for the entire time. I have had the condenser and evaporator both recently replaced and it still only blows cool, not cold air. The car has been recharged with freon and checked for leaks. The mechanic who did the work said my blend doors looked good. The pipes are cold, but when coming out air is only cool. Any suggestions would be greatly appreciated.

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  #2  
Old 08-27-2014, 11:31 AM
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Re: AC Problems 2002 Laredo

Your jeep being a laredo, it has the manual temperature control (single zone)? Then it has only one blend door. When you start the cold engine and soon switch the AC on, is then the air only cool and not cold? (Coolant still cool as well, so eliminating any blend door problem).
Are the AC lines cold close to the bulkhead? If so, then there must be flow through the line.
How does the compressor clutch cycle? On for a minute or so and then switching off?
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Old 08-27-2014, 06:53 PM
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Re: AC Problems 2002 Laredo

Thanks for your reply. It has only one manual control for both driver and passenger sides. It is always only cool no matter when you start the car. The mechanic who did the work said the blend door looked good. I had another mechanic verify the lines are cold from the bulkhead. I'm not sure if I totally understand your questions regarding the compressor clutch but if I had to guess I would say it stays on only a minute and then cycles off. I understand the issue is between the lines and the vent.
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Old 08-28-2014, 02:13 AM
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Re: AC Problems 2002 Laredo

When the evaporator is changed, then there should be something wrong with the blend door. Is the actuator motor moving?
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Old 08-28-2014, 10:36 AM
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Re: AC Problems 2002 Laredo

My mechanic replaced the evaporator and he told me the blend doors looked fine and were working. As far as the actuator motor moving I really can't say.
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Old 08-29-2014, 04:49 PM
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Re: AC Problems 2002 Laredo

The actuator motor moves the door, which will let the air bypass the heater core or send it (partly) through the heater core. When the blend door get stuck somewhere, it can heat up the air. But you should feel that with AC off, the air should not get hot when temperature selector is in cold position.
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Old 08-29-2014, 05:12 PM
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Re: AC Problems 2002 Laredo

The air though never changes temperature when the ac is on, it's always cool. not hot or cold. If there was an issue with the motor not moving the blend door wouldn't the temperature fluctuate and not remain constant? Thank you for your reply.
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Old 08-29-2014, 05:30 PM
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Re: AC Problems 2002 Laredo

When a blend door motor is stuck, the temperature will be constant. It should only change when selecting AC on.
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Old 08-29-2014, 09:59 PM
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Re: AC Problems 2002 Laredo

So what I understand you're saying is my actuator motor is not working and needs to be replaced. Is that behind the glove compartment and is it a fairly easy procedure that I could do myself? If it would be too difficult how much do you think it will cost me for parts and labor? Thanks for all your help.
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Old 08-30-2014, 07:37 AM
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Re: AC Problems 2002 Laredo

The blend door actuator for the manual system sits right behind the glove box door. It can be replaced by just removing the glove box door. But i would first do a test to see if it really is not working. For this test, remove the glove box door and then remove the actuator. With ignition switched to run, move the temperature selector knob and see if the actuator shaft rotates. If it does, then the actuator seems to be fine. Then rotate the blend door by hand and see if it is free to move. If you then warm up the engine, you can check the air temperature with the door manually hold in any position. If you still donīt get any cold air, i have to see what else could be wrong.
Attached two manual pages for the removal/install of the glove box and blend door actuator. With some basic knowledge you should be able to do this yourself.
Attached Files
File Type: pdf Glove box.pdf (164.5 KB, 1 views)
File Type: pdf Blend door actuator.pdf (145.1 KB, 1 views)
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Old 08-30-2014, 09:06 AM
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Re: AC Problems 2002 Laredo

Thank you so much for all your help. I don't know if it would make a difference but I verified the when switching to heat it works great, temp is very warm.
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Old 08-30-2014, 10:02 AM
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Re: AC Problems 2002 Laredo

At least it means that the blend door actuator works, otherwise the temperature will not change. The AC system is made in such a way that all air will go through the evaporator, independent on if cold air is needed or not. Only when cold air is needed, the compressor will be switched on and refrigerant will evaporate in the evaporator and cool down the passing air. Only when heat is needed, some (or all) of the air will pass through the heater core and be heated.
So since you have heat but no cold air even soon after first startup (coolant cold), the problem seems to be more in the AC circuit. It could be a fault in the AC thermal expansion valve, which sits in the engine compartment (called H-block in the attached page). I presume it was not changed together with the evaporator? Also check the AC lines in the engine compartment for any kinks or sharp bends. A restricted refrigerant flow, will reduce or stop any cooling. You most probably have to take the jeep to an AC specialist, who could measure the pressures in the AC lines and tell you for sure if the thermal expansion valve is the problem.
Attached Files
File Type: pdf H-block.pdf (127.8 KB, 2 views)
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