I'm new to this forum, so i'm not sure exactly how to go about this, so thank you for your patience. I have a 2000 Maxima GLE, great car with 232,000 when I purchased it(1 owner). I have had the air conditioner checked 2 different times and have been told nothing is wrong with it. At low speeds it works great, but as you increase the speed of the car the air gets warmer. Any ideas as to what may be wrong would be greatly appreciated. Thanks

 

Which components have been checked?

 

Is it manual or automatic climate control?

 

Good question. I took it in to my mechanic and he ran it on and off for a day and couldn't find anything wrong it. I'm not much of a mechanic, just trying to get some ideas. It just blows hot air the faster the car goes. Thanks for your help.

 

It has both an auto control as well as an manual control. It does the same thing in either mode. It just blows hot air as the speed of the car increases. Thanks for your help.

 

That's not the question. Does your HVAC control have a DIGITAL screen or does it have a **** for fan control and slider for temperature?

 

I apologize for not understanding your question. It has a digital screen

 

I've heard that the temperature sensor can cause this problem, but I can't recall. Do some searching and see what you find.

 

condenser...... on blower motor but leaning more towards the condenser


Posted from Maxima.org App for Android

 

T_Behr may be on to something. Run the self diagnostic on the control panel and see if that runs successfully, especially part 5 which checks the temperature sensors.

The self diagnosis starts on page HA 37 in the FSM.

 

Nah, OP doesn't complain about air flow so blower motor is fine.
Condenser (radiator in front of the car) is also most likely fine as it is having harder time to cool down when car is moving slowly than when it's moving fast. The same goes for evaporator/compressor for the same reason.

I'd say something is wrong with control system. It's interesting to see how it behaves if you'd press internal circulation button- do you hear air doors moving and how air temp. depends on car speed in this case?

 

Had this same problem with my 2002 Chrysler Town and Country van that had the dual zone auto climate control. It would blow warm on one side but cold on the other. New internal temperature sensor fixed the problem and it never came back. Hope that can point you in a good direction.

-Nathan

 

No, I don't hear air doors moving. Thanks for the advice. I'll have a few things checked

 

I will thanks for your advice. I'll let you know.

 

I'm wondering if his compressor is wearing out internally.

 

His problem worsens with car speed that's why I suspect motor/mechanism controlling air door. If it doesn't shut it then he'd be getting too much outside hot air and its amount will increase with speed.

 

If it is the recirc flap that makes sence.

 

Have to admit that it sounds logical. But I don't have that problem. I drive 80 mph here in 105 plus degrees and the car is nice and cold inside. And that's without using the recirculate mode.

It is an interesting problem, I would like to hear what fixes the op's problem.

 

I asked him to put AC in recirc. mode because air door control mechanism makes a lot of movements doing so and eventually is supposed to shut off external air completely. He didn't hear anything and the problem persisted even in recirc. mode. I think, if he follows FSM AC test procedure it would fail tests related to air door control mechanism. I don't have FSM handy but something of that sort was there.