I've got a M3R47-2. Fans are turning, compressor sounds to be on. Freon is good also. Blows semi cool air but maintains a 55-60 degree F temp. Any ideas? If so, do you have part #'s?

A system will only drop temp about 20 degrees from outside temp. I would have then recheck the Freon level again. To much is as bad as to little when it come to Freon. Also the oil level can be to high causing the same thing. When they changed the compressor they should have also replaced the dryer and the orfice tube/screen. If that wasn't don't you could have a obstruction in line.

Sounds like it could be low on freon I believe these units have about 1.5 pounds of freon in them and are critical in not undercharging or overcharging them if it is a freon 410 ac unit the pressures should be about 135 and both lines cold if is low on freon a service tec will need to be called to try to repair the leak if possiable

It is very possible that the A/C is not engaging part of the time. It can be overcharged. You have 2 safety switches on the A/C system. A high pressure and a Low pressure.

Pressure inside the system is dependent on the background temperature where the car sits. This means the A/C does not have to be turned on for the switches to activate. Their job is to cut off power to the compressor, so when you start your car, the power to the compressor may already be switched off.

There are charts for filling the Freon system. For sake of conversation, lets' say the low pressure cuts off at 20psi and the high at 300psi. Those are the ratings for the respective switches. You have a low charge, say 25psi at 80 degrees outside temp. Overnight or a Cold front comes in and the outside temp is 70 degrees. The system drops to 19psi as the car sits. The compressor clutch will not get power. Also for the high switch, the car sits as outside temp goes to 100 degrees. The A/C pressure climbs to 325psi as the Freon expands, the compressor clutch will not get power.

This is why many instructions tell you to bypass the pressure switches to charge the system. Your switches are constantly working to keep the pressure between 30psi and 300psi. MODERATION is key here. The longer the compressor clutch stays engaged, the more cooling you will have.

So the car makers recommend a fixed amount of Freon for each Model of car. Volume capacity is different for the length of the hoses, the size of the condenser, the chamber inside the compressor. It all is calculated so they know how many LBs of Freon will fit in the space to produce a given pressure.

Most of the pressure switches can be changed without significant loss of Freon, just a puff when the switch is removed and replaced. I have replaced more low pressure switches than the highpressure. It is probably because the springs are much weaker on the low side.

Some major autoparts stores have tool loaner programs. Manifold gauges are used to read both pressure ranges. If you did not purge the system with an electric or air powered Vacuum pump, you may have water condensation forming ice in the lines.

I hope my solution helps you.

Cooling fans working? If you notice the air getting warm mostly while stopped, probaby cooling fans not turning on. if the fans are working properly, may be low on freon and need a recharge.

You say temp fan?If you mean the cooling fans,then the ac is out of freon most likely,the freon has to be in the system,and enough to kick the compressor on,therefore turning the cooling fan on.

bad actuator

The fans are controlled with a clixon that has a cut in at 5 degrees, and cut out at 20 degrees. If the unit is running and the fans are not comng on then I would have to say you are out of freon. But your condensor fan could be running and the compressor NOT be running which could be a problem with your compressor. Find out if your compressor is running by taking an amp draw. If compressor IS running then you are low on freon. If the compressor is running and your evaporator coil is cold and your fans AREN'T coming on then your clixon is bad.

plus one on the cooling fan problem. if it was low on charge then as you slow down, condensor temps and line prressures would raise therefore it would cool at low speed and and not when moving since the incoming air would drop system temp,reducing line pressure and then cusing compressor to cycle. the auxillary cooling fans must be on whenever a/c is on, if not, thats your problem. get this taken care of because if you get stuck in traffic, your engine will overheat also if fans are not running

Hi, Does thermostat on a/c goes lower than 75? put hands close to air coming from a/c is it cold, like 50, if it's cold like 50, maybe you a/c are to small for space, check a/c b.t.u's ( british thermal units) how many b.t.u's is your a/c , there are a chart, for size of room and how many b.t.u's you'll need to cool space (room), or possible if air coming from a/c are 75, your compressor could be short cycling, it hard to tell when fans are working, listen carefully to hear if compressor makes clicking sound, place thermometer close to a/c vent and let me know temp, maybe there's freon leak. let me know temp of air coming out from a/c, then i could tell you exactly what's problem. good luck.

Its Most Likely Lost Its Freon Or The Compressor Seals Are No Good When The Unit Is On See If You Hear A Whirling Sound Alot Like Your Fridge. Put Your Hand On The Compressor To See If Its Vibrating ( Looks Like A Metal Ball) If It Is Have A Ac Repair Place Check The Freon To See If It Has Run Out Or Is Low. If It Doesn't Feel Like Its Running Have Them Check The Compressor For You. Cooling System Components Should Not Be Serviced By Anyone Who Has Not Been Properly Trained To Deal With Freon.
Sincerely,
Michael Scott