Hey guys wanted to know if anyone has cleaned their A/C Evap without removing it? I've been having an issue with the a/c's air flow. It has been severely reduced over the years and figured it's a dirty evap since the vent temperature pulls a 46 degrees reading. Any recommendations or first hand experience knowledge being shared would be much appreciate. Thanks in advance.

 

46degress is well with in specification. a plugged core would cause more of a airflow issue than temperature issue.

 

What year truck? 46 is too high for any vehicle.

 

Not when referrig to air temperature out of the vent.

 

98 f150 4.6 v8, and yes my issue is the airflow not the temp of the a/c.

 

Is it being diverted to lower vents by mistake? Do you see a change when on max/recirc?

 

If you are talking to me? 46 will never work here in Texas.


Ford has folks (owners) believing their rule of thumb, which is not supported anywhere in Ford design documentation, 1/2 of ambient plus 5 degrees should equal vent temp.


If your coil is designed to run at 36-37 degrees, why in the world would you have a vent temp of 46 degrees? 9 degree heat gain to travel 18 inches in a duct?


This is Fords way of getting by with the cycling changes for fuel economy.

 

No more than likely cleaning it will not help. The moisture created will build a paste like substance in the fins of the core.

I can tell you are way off on the actual efficiency of R134a systems. It doesnt matter what the evap core is designed to do. It can cool as efficently as the freon will allow. Also a lot depends on the style of a/c being used. In these vehicles 42-48* is completely with in Fords specifications of a correct functioning a/c system.

 

No issues with the direction of the air flow, defrost goes to defrost fents, floor goes to floor vents and so on. And yes there's a significant difference from max a/c and standard a/c settings. The flows velocity changes as should with each setting. The issue is that the overall airflow velocity is about half of what it should be and I wanted to fix that.

 

The Vent temp of 42-48 is a wide range and ford would love for you to buy into that, and unfortunately, many do! My wifes Edge and My sons Explorer will freeze you out with vent temps consistently well below 40 degrees.


These f150 with a vent temp cycling the compressor between 42-48, will never cool sufficiently!