03 G35 Coupe

i recently recharged my freon because it wasnt getting cold enough, now i'm pretty sure the a/c relay needs to be replaced, as when i first turn the a/c on my fans come on and than shut off right away, i'm not overheating at all. but it is causing the air to be cold one second and than hot air blows the next, than back to cold. Can someone please point me in the right direction of which relay this is and where it is located, or how this issue can be resolved. appreciate the help.

 

What were your high and low pressure readings when you added the freon? I don't quite agree with your relay theory at this point, I would suspect a high or low pressure problem.

Refrigerant System Protection, the refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sensor, located on the condenser. If the system pressure rises above, or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage signal to the ECM. ECM makes the A/C relay go OFF and stops the compressor when pressure on the high-pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm2 , 398 psi), or below about 134 kPa (1.4 kg/cm2 , 20 psi).

See attached table for required pressures.

 

I'm going to guess you dumped a can in without really getting high and low side pressure readings.

You need those before we can diagnose further.

 

Sorry haven't had a chance to get around to messing with this until now when this wonderful florida sun actually started bothering me.... So one of my friends is the one who helped me put freon in, which is the same one that is helping me now since he has the gauges. He was saying the lbs are suppose to be at a certain level but i wanted to double check with you guys what numbers their suppose to be at on my car since he mainly deals with Hondas.

He was asking me what lbs was suppose to be on the high side??
and what level of freon is suppose to have for the low side?

never really messed with a/c before since my dad knew how but he is no longer with us. But my friend has gauges and figure i could learn. So any help is greatly appreciated..

 

Acere, it took you almost a year to respond . If you look a couple of posts back, I posted a table with the information you are looking for. I would say that in Orlando this time a year in the shade, you probably need to go with the 95 degree (F) scale.

Dale

 

yes i'm just now replying to this sorry, i usually roll windows down hense why no rush. but anyway got around to putting the guages on and it seems that my levels are within spec for 95 air ambient but still having the same issue. Its mainly an issue in the city as you can feel the air get warm (a/c fan is new i replaced it) and than kick back in, as on the highway stays pretty cool consistently. any suggestions are greatly appreciated.

 

 

Thank you Sir, I hope the info you have provided works.