Ac blowing at 55 degrees....

All the time or first cool then warm??

First cool then warm may you need to defrost ...

 

What about a plugged up drain tube from the evap core? Seen some fill up half way with water and freeze. Air flow was still good but with only half the evap core exposed it wouldn't cool as good as it should. Is the condensor clean?

 

A couple of things...

Is it an orifice tube system or does it have an expansion valve?

Is the blend door working?

 

If it's freezing up it's one of three things.

1. Low air flow across the evaporator from a plugged up cabin air filter or plugged up evaporator fins.

2. A bad expansion valve.

3. Some systems have a separate evaporator temperature cutout switch.

 

If the pressures are good and it's an orifice tube system, 55 degrees might be all you get. Orifice tube systems are less efficient and you will usually only get 40 to 45 degrees below ambient.

If it has an expansion valve system, there is definitely a problem. You should be able to hit 40 degrees even on a very hot day with a TEV system.

Is it pissing water out the drain when it runs?