hi, i have no problem with my climate control on my 02 Qx4... but in this hot summer, i am not getting any cold air when i turn on the Auto Mode...
My winter went by great as the heater worked perfectly and the blower motor is fine as well.
could my A/C gas need a refil?
thank you
No cold air... Heater works...
Re: No cold air... Heater works...
Turn on A/C, does the clutch control turn on so that the compressor is energized. No compressor no cooling effect. The compressor turns off/on with the clutch control according to the head pressure of the compressor but the initialization of the clutch is via the A/C being on by you and the safeguards within.
Too low a freon will still allow the compressor to come on. Japanese A/C are generally very good. QX4 use variable plate V6 compressors, check the simple things first...like the compressor switch, the clutch, the recirculate vs fresh air, the main door vent to direct the air flow and your primary HVAC controls
Too low a freon will still allow the compressor to come on. Japanese A/C are generally very good. QX4 use variable plate V6 compressors, check the simple things first...like the compressor switch, the clutch, the recirculate vs fresh air, the main door vent to direct the air flow and your primary HVAC controls
Re: No cold air... Heater works...
hey man i tried looking at the problem but i cant figure out the clutch youre talking about... could you please explain a bit...
sorry and thanxxx
sorry and thanxxx
Re: No cold air... Heater works...
Clutch is electro mechanical device to engage the compressor. It is separate to the compressor but attached to the front of it. When your on switch is engaged to clear windshield or cool the interior the clutch is engaged to allow the drive belt from the engine to turn via the clutch the compressor which is usually a V 6 piston machine that must compress freon to make it cool the car's interior. The clutch seals up the compressor turns, you get cooled, you get too cold turn the clutch off and the drive belt turns only the free wheel part of the clutch so compressor stops compressing, no more cooling. This is done automatically with an auto HVAC system.
Do your controls work?
Does your clutch work?
Does the compressor turn?
Does the heat control shut off?
Does the thermostatic control provide heat at various temperatures?
Some times the compressor is working but you have the heat on and your 5 ton compressor cannot keep up with the heat.
So start off with the easy things, turn on /off the cooling controls with the hood up, do you hear the compressor engage and the motor speed pick up?
Do your controls work?
Does your clutch work?
Does the compressor turn?
Does the heat control shut off?
Does the thermostatic control provide heat at various temperatures?
Some times the compressor is working but you have the heat on and your 5 ton compressor cannot keep up with the heat.
So start off with the easy things, turn on /off the cooling controls with the hood up, do you hear the compressor engage and the motor speed pick up?
Re: No cold air... Heater works...
what do you say to a compressor that engages upon start up. blows cool air not necessarily cold though. Then shortly thereafter, the compressor turns on. When it turns back on its for a quick second and then turns off. It keeps doing this with the time interval varying but usually a minute. I filled it with freon, but I am thinking I may have an issue of too much freon causing the compressor to not want to stay on?????
Any help
Any help
Re: No cold air... Heater works...
Pito
The compressor only energizes if the clutch for it has a signal to come on, generally when the controls for HVAC are set to defrost the front window or the A/C is on. Check that the A/C controls are correctly set and working, check that the defrost is also correct and working. Your control buttons, levers could be OK but your contacts behind the controls are not.
I do hope that when you added freon to the compressor you drained all other freon and recaptured it, then measured the correct amount to put in. If not, there may be too much liquid freon in and the conversion to a gas is inhibited.
Compressors are like air compressors but the change of state from liquid to gas to liquid is crucial to the thermal operation. Freon has that ability to change states, at a temperature that can be used to heat or cool humans. Too much or too little makes a difference and if your compressor lost freon as a gas how much was lost, and how much to refill? This is an unknown so whatever is in there needs to be removed, oil removed, evacuated, checked for leaks, oil put in, possibly a new drier and then topped with the proper freon, then run and test at various temperatures to see if the condenser works, the evaporator works and thus the change of states are taking place.
If you used a bottle of freon prepackaged, what quantity, and why? Without knowing what was in there. Compressors, air or freon are simple machines but the controls only work if the compressor is able to compress properly and with both air and freon, that compressed gas must go someplace out of the compressor, otherwise the compressor stalls
The compressor only energizes if the clutch for it has a signal to come on, generally when the controls for HVAC are set to defrost the front window or the A/C is on. Check that the A/C controls are correctly set and working, check that the defrost is also correct and working. Your control buttons, levers could be OK but your contacts behind the controls are not.
I do hope that when you added freon to the compressor you drained all other freon and recaptured it, then measured the correct amount to put in. If not, there may be too much liquid freon in and the conversion to a gas is inhibited.
Compressors are like air compressors but the change of state from liquid to gas to liquid is crucial to the thermal operation. Freon has that ability to change states, at a temperature that can be used to heat or cool humans. Too much or too little makes a difference and if your compressor lost freon as a gas how much was lost, and how much to refill? This is an unknown so whatever is in there needs to be removed, oil removed, evacuated, checked for leaks, oil put in, possibly a new drier and then topped with the proper freon, then run and test at various temperatures to see if the condenser works, the evaporator works and thus the change of states are taking place.
If you used a bottle of freon prepackaged, what quantity, and why? Without knowing what was in there. Compressors, air or freon are simple machines but the controls only work if the compressor is able to compress properly and with both air and freon, that compressed gas must go someplace out of the compressor, otherwise the compressor stalls
Re: No cold air... Heater works...
ARKQX33V6 ... Buddy thanx for all your help...
I am having a ton of trouble turning on my AC... So far, my mechanic says that he could manually engage the AC without the Climate control. So he could turn the AC Compressor on right.. NOW he thought that my Climate Control Head unit is the problem. So today i bought a new one and checked it out...
NOTHING....
Still the same HOT AIR being blown at the coolest temp. and on AUTO.
What can i do man? there is something wrong in the middle.... which means... MY HEAD UNIT (SWITCHES) are fine, Compressor is fine. but they are both not communicating with each other...
Help me a bit please...
I am having a ton of trouble turning on my AC... So far, my mechanic says that he could manually engage the AC without the Climate control. So he could turn the AC Compressor on right.. NOW he thought that my Climate Control Head unit is the problem. So today i bought a new one and checked it out...
NOTHING....
Still the same HOT AIR being blown at the coolest temp. and on AUTO.
What can i do man? there is something wrong in the middle.... which means... MY HEAD UNIT (SWITCHES) are fine, Compressor is fine. but they are both not communicating with each other...
Help me a bit please...
Re: No cold air... Heater works...
Open up the climate control unit and find the wire to the clutch, do not ground it. With that wire that controls the clutch, put 12 V + DC to it, the clutch should engage and the compressor spins. If your heat is on even low that compressor cannot overcome the heat, so make sure the heat is off. You may have to feel with your hands the exchanger in the cabin under behind the glove box area.
Car A/C compressors are 2-3 tons, 36000 BTU but the heaters are 100,000 so the heater will over power any cooling.
When the compressor operates regardless of whether heat is on feel the discharge pipe, it must be cold (45F) If it is feel the incoming liquid side it should be warm about 100F. If so, the compressor is working.
Check that all heat is off to climate controls, put blower on high, air should be the same temperature as outside or cooler.
Keep fan on high
Engage the compressor, air from fan should be colder than outside ambient.
Try this and post results
Car A/C compressors are 2-3 tons, 36000 BTU but the heaters are 100,000 so the heater will over power any cooling.
When the compressor operates regardless of whether heat is on feel the discharge pipe, it must be cold (45F) If it is feel the incoming liquid side it should be warm about 100F. If so, the compressor is working.
Check that all heat is off to climate controls, put blower on high, air should be the same temperature as outside or cooler.
Keep fan on high
Engage the compressor, air from fan should be colder than outside ambient.
Try this and post results
Re: No cold air... Heater works...
Okay so i finally figured out everything...
I have the 03 QX4... or it is the same as the 03 or 04 Pathfinder LE....
These vehicles came with the Auto Climate Control. Which means that in the front of the car there are two ambient sensors. (for those of you that dont own the above mentioned models, check out the front ambient sensor. Tapped will be another port right beside it that sits empty) That empty port is used to plug in the other ambient sensor (totally identical) that determines whether to turn on the air conditioning or heating.
My Vehicles had been in a front bumper accident before i bought it so which ever genious fixed it didnt realize that this QX4 requires the other sensor. So today i went to the junk yard and picked up another sensor and VIOLA!!!!
MY AC WORKS NOW...
THANK YOU ARKQX33V6...
I have the 03 QX4... or it is the same as the 03 or 04 Pathfinder LE....
These vehicles came with the Auto Climate Control. Which means that in the front of the car there are two ambient sensors. (for those of you that dont own the above mentioned models, check out the front ambient sensor. Tapped will be another port right beside it that sits empty) That empty port is used to plug in the other ambient sensor (totally identical) that determines whether to turn on the air conditioning or heating.
My Vehicles had been in a front bumper accident before i bought it so which ever genious fixed it didnt realize that this QX4 requires the other sensor. So today i went to the junk yard and picked up another sensor and VIOLA!!!!
MY AC WORKS NOW...
THANK YOU ARKQX33V6...
Re: No cold air... Heater works...
Glad it is fixed!!! And thank you for telling us how it was resolved. I think knowing helps us all out.