hi there
I tried to use ac 2 days ago because it was very hot.but heard that the compressor keeps engage and disengage about every 5 seconds.(cold air-warm air-cold air-warm air^^^^)I thought the gas was low so I just regassed the car. but the compressor is still doing that.
any one know whats wrong with it?

 

If yours is a 2004 within certain build dates, it's possible that you need to "reprogram the amplifier". The notice pretends that it's all about recirculation but it appears to make a major difference in the duty cycle as well, if you have one of the applicable amplifiers.

AC NOT COOL (AFTER 9/11/03 PRODUCTION)
Applicable Models
Model Starting S/N Ending S/N
2004 RX8 40118171 ********

Some customers may complain of lack of AC cooling from the vents. This may be caused by the intake air selector (recirculate / fresh) in the "FRESH" mode. Cooling the interior of the vehicle may take longerif the air intake selector is in the "FRESH" mode. Maximum cooling is acheived when the intake air selector mode is in the "RECIRC" position. The AC amplifier can be programmed to automatically default to "RECIRC" mode when the following conditions are met: 1. Ambient air temperature is 68 deg. F or higher. 2. HVAC control mode is in "FACE" mode. 3. HVAC temperature is in maximum cool setting. Customers with this concern should have their vehicle repaired using the repair procedure. NOTE: Vehicles produced before 9/11/2003 are not programmable N should have the AC amp replaced per Service Bulletin # 07-002/04 1. Verify concern. 2. Verify ignition switch is in OFF position. 3. Press and hold the front defrost and air intake selector buttons simultaneously. 4. Turn the ignition key to the "ACCY" position for 3 seconds. (Continue to hold the buttons down from step #3.) 5. Turn the ignition key to the "ON" position for 3 seconds. (Continue to hold the buttons down from step #4.) 6. Successful programming will be confirmed by the rear defrost indicator light flashing 3 times. NOTE: If vehicle's battery dies or cables are removed, the programming will not be retained and must be performed again.

 

What are your gauges reading??

 

The cycling that you described can be a symptom of low refrigerant charge (which would indicate a leak somewhere in your AC system). I'm afraid you're going to have to take it to a automotive AC shop to get it properly tested though.

 

I just regassed the car.unluckly no different at all

 

The gauges seem ok.

 

Did you try the reprogramming?

 

What pressures are they showing?

 

It recycles between cold and warm all the time its normal.

You should take the car out and drive it. I bet it works just fine.

 

i tried but it seems not working with that methord on my car

 

came back from AC automotive shop.they check the system and regassed again.thay said it was a bit low(should be 41 but only got 29 in my car.i dont know that 41 and 29 mean)
they said nothing wrong.no leaking.all the rx8 is like this
I may just leave it
thaanks all you guys for the help

 

Sounds like the low pressure saftey switch was doing it's job; glad it turned out well.