ac not working

Hi CALCCC,

It sounds like the AC is down on charge but to be sure here is a video and guide to help us.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

and

https://youtu.be/uZrQCGwXfek

Please run down these guides and report back.

I had this problem and had to get the kit cost me $39.00 all fixed I love this site.

Hello so i have a question on how to fixy radio it doesn't catch any signle and if it does it is very staticky do you have any idea how to fix that? Also my AC only blows air but it never seems to get cold

May be an aerial earth problem for the radio and get the refrigerant charge checked, you may have a leak in the system.,

Air Conditioning problem
1998 Nissan Maxima 6 cyl Front Wheel Drive Automatic

I'm experiencing an intermittent A/C problem with my 1998 Nissan Maxima. The A/C works 8 out of 10 times. It works on most days here in South Florida. It seems that the problem occurs more frequently at night or when it rains. The A/C doesn't come on for 20-30 minutes. If it's raining outside it makes driving very dangerous because the windows fog up. I had taken it to the Dealer and they told me it was the radiator. After spending $700 dollars for a radiator the problem did not go away. I took it to another service station, friend of m y neighbor, and they told me the radiator fan and assembly needed to be replaced. I spent another $620 and the problem still did not go away. It's the strangest problem and I don't know what else to do at this point. I can't pinpoint what the issue is because the A/C will blow cold in less than 5 minutes on most days. It just seems like after or during a rain or at night some times it won't start blowing cold for a long time (20-30 mins as mentioned above) but then it just kicks and starts blowing. Any suggestions would be welcome.

Your problem appears to be pretty obviously electrical. The problem is that the electrical system cannot be troubleshooted unless the problem is resent at that time. It would be pretty easy if it was timed correctly but impossible if it is not.

Air conditioner problem: it blows cold air only at high speeds on high ways but when idle like in a traffic it blows only ordinary air.

ordinary air? lol. check to see if your fans are operating when air conditioner is on they should. if not check relays and fuse under hood. also make sure condenser is not clogged up with leaves and debris. It sounds more like a fan problem on condenser though not kicking in.

Yeah lol ordinary air, i mean its just like a fan with no cold air condition, also noted that it is working really good when at night when temperature is low, Fans are running excellent i did a full check for all the relays and fuses all are in function and working.

Condenser is not clogged and i did a air blow cleaning all the dust that was on it, but it is still the same !!!

And just for your information, the AC gauge readings are both normal for high and low pressure.

check cooling fan for working it should come on as soon as a/c is turned on check relay and fuses underhood and grounds one is marked and another may be behind rh headlight.

Yes, they work excellent and yes they work as soon as i turn the AC on, all relays are working

And another thing is that it will also blow cold air whenever the temperature outside it low

if it works good at speed then either there is not enough Freon in system if all things are working or maybe your terminal ends on battery and hvac temp actuator blend door is closing due to not enough power. you say the pressures are normal but if they are normal it should cool so things may not truthful. Is the belts tight and not worn out as recommended replacement of tensioner and belt is 60,000 mi. the whole story isn't be told here.

Well then i guess i need to replace the belts.
And the other thing is, what about the condenser, do you think it can be clogged and can cause this?

When I turn on my AC it might blow cold or warm air. If it's blowing warm I have to turn the blower off and then back on several times until it cools off. Once the air is blowing cold, it does not stay that way for very long. I have to flip the switch again to get it blowing cold. What's wrong?

Hello –

To better assist you please tell me if your model is a GLE, GXE or SE. Also the engine size in liter and the 8th digit of your VIN.

When it is blowing cold air are you driving, that is the car is moving down the road and then when you come to a stop, then it starts to blow warm air.

not the condenser but if desecant bag broke it could clog the orfice and screen what are the pressures at what temp and at about 1500 rpm.if this is auto temp control where yo set the temp then it may be a problem with that unit.

My car is a 1955 Nissan Maxima SE. It has a V6 engine (liter-?), and the 8th digit of my VIN is D.

The car can be moving or sitting still when the change in climate occurs. It can be cool and sitting still or warm and moving, and the only thing that potentially rectifies the promblem is switching the blower off and on (sometimes several times over).

Pressure is:

Low 60 PSI, High 160 PSI
Outside Temp: 40 C
Humidity: 70%

It is a Manual Temp control.

Hello –

Thanks for the info and getting back with me.

You can find out the liter of the engine by looking under the hood and it should be on a decal on the bottom of the hood, in front of the radiator etc.

Next, with the hood up, please make sure the AC/heater is off, fan and all and the engine is cool.

Locate the radiator cooling fan.

Next start the car and see if the radiator cooling fan is turning…….you don’t want it to be. Then turn on the AC, high cool and then look at the radiator cooling fan….is it spinning….

Please let me know.

your compressor may be on the way out see temp/pressure chart low side is ok but high side is to low should be higher. see pressure charts you might try letting a little Freon out as it may have to much in system.

Hello - Also, it looks like you may have some recalls on your vehicle. The dealer may fix these for free. Please contact the dealer service department, give them the VIN number of your car and have them check on these to see if they apply to you.

1999 Nissan Maxima 196000 miles

I'm looking @ buying this car, but the owner told me that the a/c doesn't work and I will need new tires. I've priced tires, but can you tell me how much it will cost to get the a/c fixed from min-max? I have a 10 mo old son, so I will definitely need the AC to work. Also, the car does have 196,000 miles, is this going to be a good reliable car that will last me awhile w/out having to keep putting money into it for repairs? I tend to do a lot of driving and can put a lot of miles on car in a short amount of time.

Hello –

To better assist you is this model a GLE, GXE or an SE…..also do you know the engine size in liter

It's an SE Limited; I do not know the engine size in liter.

Hello - Okay......thanks for the info......... The tires............not sure where you are getting them but you might try looking at TireRack and they ship them to you then you just pay, say at Walmart to have them balanced and mounted. It may be cheaper so check it out. http://www.tirerack.com/index.jsp The AC....wow................I would say about $2000............if all is bad....the quote is below on what we figure.

It also depends on what is wrong....the only way to find out for sure is if you have someone test it and they tell you...........if the compressor shelled....then you can bet you need to pretty much replace it all.................. Also I have attached what the car should cost you...............but condition is a big factor.

Okay....my opinion without looking at the car................. The car may last but with that many miles you will be having problems because it is time for things to be going....it is normal............ If I were you and with a 10month old.....I would shop around some more and see what else is out there.

Wow thank you so much for your answer and opinion. I was a little surprised at what the a/c might cost. I will definiely want to find out exactly how much that's going to cost before I decide to purchase this car. I actually googled 1999 nissan maxima tires and that same website popped up, and that is where I priced tires for this car. Thanks again, I will keep looking around to keep my options open. So in your opinion less miles the better?

Hello –

Tricky question………..less miles are better unless someone is trying to unload a problem….

You appear to need a good dependable vehicle so you and the little one don’t get stranded. Of course I purchased a vehicle – ran it on the machines did a good look over and 1000 miles later I was pulling the heads off……..

So…….you need to look around at a low mileage car and then do some research on it. Not sure what you can spend but places like CarMax or other places that can show you the history of the vehicle on a carfax……..

If you know the person and they took care of it then that is a good thing too.

Have someone that knows about vehicles go with you to look it over or take it to your dependable mechanic and have them check it over.

What are you driving now that determines to get a different car?

My air conditioning only seems to work when travelling at freeway speeds. No matter how long I drive in the city, it does not cool down the car. To try to solve the problem a year ago, I had the air conditioner serviced at the dealer, which I think involved cleaning it and charging the freon. They did not find anything else wrong with it.

Is there some specific problem that would cause the ac only to work when travelling at freeway speeds.

Thanks

Hi isaac17,

Check with AC on and engine idling,

1. compressor clutch is engaged?

2. cooling fans working?

Are the condersor or air flow restricted?

If the compressor operates at low rpm but the cooling is inefficient, you need to check the pressure. A weak compressor would cause the problem.

I had the same exact issue the dealer replaced some soilnold behind the control on the dash and now fixed cost me 199.00

My 92 maxima blows heat in the cabin, but I have to adjust the setting between 82-85 before I feel any heat. Can the calibration go bad on these units and if so can it be repaired? Also the LED light behind the temp readout once a while goes dim, then comes back bright. What's the deal????????

Hello .. thanks for the donation .. much appreciated Hope this helps .. let me know if you need any more information Automatic A/C-heater system consists of electronically controlled components added to standard air conditioning system. Automatic A/C system is controlled by the auto amplifier. See Fig. 1 Fig. 1: A/C System Control Panel ID (Auto Amplifier)

Auto amplifier unit is a switch control panel and microcomputer assembly. It processes various sensor information and controls air mix door, fan speed, outlet door, intake door, A/C compressor clutch, memory function and water cock (heater control valve) solenoid. NOTE:For A/C-heater components not covered in this article, refer to MANUAL A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT Section. OPERATION Automatic A/C-heater system controls optimum airflow (fan speed), outlet air temperature and outlet air vents to maintain vehicle interior temperature at desired setting. AIR MIX DOOR MOTOR Air mix door motor is attached to heater unit. Auto amplifier commands air mix door motor to rotate a shaft to move air mix door to a set position/angle. Air mix door position/angle is monitored by Potentiometer Balance Resistor (PBR), located inside air mix door motor. Door position/angle is continuously being fed back to auto amplifier by PBR to allow auto amplifier to move door position/angle for desired temperature. AMBIENT TEMPERATURE SENSOR Ambient temperature sensor, located below hood latch, detects ambient (outside) temperature and converts this reading into a resistance value read by the auto amplifier. See Fig. 2 . If auto amplifier detects an abrupt change, it gradually adjusts interior temperature (.6 °F per 100 seconds) until desired setting is reached. If vehicle stops in traffic after highway speeds, ambient temperature sensor detects high temperature from heat off radiator. To counteract this sudden temperature change, ambient temperature input process (inside auto amplifier) gradually adjusts interior temperature to prevent an unpleasant temperature changes. ASPIRATOR Aspirator, located on lower, front of heater unit, produces a vacuum from outlet air discharged from heater unit. This aspirator vacuum pulls air from driver's side area, through in-vehicle temperature sensor. AUTO AMPLIFIER A/C system control panel (auto amplifier), is a microcomputer that monitors and processes information from various sensors. Auto amplifier controls air mix door motor, mode door motor, intake door motor, fan motor and compressor clutch operation. Self-diagnostic functions are built into auto amplifier to check A/C system malfunctions. See Fig. 1 . Auto amplifier detects sensor voltage differences by monitoring an internal, fixed resistor for each sensor. Each sensor is fed 5-volts through the fixed resistor by a constant voltage circuit within auto amplifier. Voltage is then applied to ground through sensor resistance. This resistance value is the input read by auto amplifier. SELF-DIAGNOSTICS NOTE:During all self-diagnostic functions, ensure fresh air vent on auto amplifier is in OFF position, unless otherwise indicated. Also see TROUBLE SHOOTING in this article. SELF-DIAGNOSTIC INFORMATION PRELIMINARY INFORMATION To properly diagnose this system, self-diagnostics should be performed in the following order: Read ENTERING/EXITING SELF-DIAGNOSTICS. Perform SELF-DIAGNOSIS STEPS 1-5. Perform appropriate PRELIMINARY CHECK chart under TROUBLE SHOOTING CHARTS for symptom diagnosis. PRELIMINARY CHECK charts refer to proper DIAGNOSTIC PROCEDURE chart(s). Perform DIAGNOSTIC PROCEDURE chart(s) under TROUBLE SHOOTING CHARTS. ENTERING/EXITING SELF-DIAGNOSTICS Start engine and immediately depress and hold OFF switch on auto amplifier for at least 5 seconds. DO NOT enter self-diagnostics without engine running. Select self-diagnosis steps 1-5 by pressing temperature control switches. After selecting step 5, auxiliary mechanism test may be selected by pressing FAN switch. Auxiliary mechanism test checks temperature setting trimmer. To cancel self-diagnostics, press AUTO switch or turn ignition to OFF position. SELF-DIAGNOSIS STEP 1 Checks Light Emitting Diodes (LEDs) & Segments Step 1 starts automatically when self-diagnostics are entered. All LEDs and fluorescent display tubes should illuminate. See Fig. 1 . If all LEDs and fluorescent display tubes DO NOT illuminate, repair or replace as necessary. If LEDs and fluorescent display tubes test okay, replace auto amplifier. SELF-DIAGNOSIS STEP 2 Checks Sensors For Open/Short Circuits Position vehicle to enable sunlight to shine on sunload sensor. Enter self-diagnosis step 2 by pressing UP temperature control switch on auto amplifier. Display will illuminate a 2. If all sensor circuits are okay and no trouble codes are present, display will change to Code 20. It takes auto amplifier about 4 seconds to check all sensor circuits. If a sensor circuit is faulty, circuit code number will flash on display. Shorted circuit will have a flashing "--" in front of the number 2. Open circuit will NOT have a flashing "--". If, for example, 21 is displayed on auto amplifier by an illuminated 2 and a flashing 1, an open circuit is indicated. If two sensor circuits are faulty, each circuit code number will blink twice. See SELF-DIAGNOSIS STEP 2 CODE EXPLANATIONS TABLE to determine what a code number means. SELF-DIAGNOSIS STEP 2 CODE EXPLANATIONS Code....Sensor 20.......No Trouble Codes 21.......Ambient Temperature Sensor 22.......In-Vehicle Temperature Sensor 24.......Intake Sensor 25.......Sunload Sensor 26.......Potentiometer Balance Resistor (PBR) SELF-DIAGNOSIS STEP 5 Checks Temperature Detected By Sensors To enter self-diagnosis step 5, press UP temperature control switch on auto amplifier. Display will illuminate a 5. When DEF switch is pressed once, display will show temperature detected by ambient temperature sensor. Press DEF switch again, display will show temperature detected by in-vehicle sensor. Press DEF switch again (3rd time), display will show temperature detected by intake sensor. Press DEF switch again (4th time), display will return to 5. If temperature shown on display is greatly different from actual temperature, inspect sensor circuit. If sensor circuit is okay, check sensor. See appropriate sensor under TESTING. AUXILIARY MECHANISM SETTING Temperature Setting Trimmer Temperature setting trimmer compensates for small differences between temperature setting on display and actual temperature within a range of +/-6 °F (+/-3 °C). With system in SELF-DIAGNOSIS STEP 5, press FAN switch. System is now in auxiliary mode to set trimmer. Each time UP or DOWN temperature control switch is pressed, temperature display changes in one (1 ) degree Fahrenheit increments. NOTE:If battery is disconnected, temperature trimmer setting goes to 0 ° on both Fahrenheit and Celsius scale and will have to be reset.

I put to cans of refrigerant, and it is still not cold, what should I do next to fix the A/C ? power window do not work. I just put a new power window relay, and a new fuse, but my windows still are not working, what should I look in to next to get my windows working.

is the clutch coming on for the ac?? what are the exact pressures??

check for up and down commands from the master switch.

Roy

if its that low u have a leak.i would remove the switch and test that voltage is being sent to the motor.try holding the window button to go down and bang on the door panel with your hand.if the window starts working the motor is bad.

You have probably over charged the system an a high pressure cut out switch may have shut down the system as a safety device, refregrant is added in a precise quantity, just adding what you think is no answer to these problems, if the system was low, there will be a leak that need rectifying, A/C servicing should only be done by a qualified tech, i would go see one and get the system checked over.