Just wondering. is it posible to convert the standard ford tube valve design to an expansion valve style like mopar products have? you get sooooo much colder air from an expansion valve than you do a tube valve. i have a customer at my shop whos a/c we just recharged... the needle thermometer we stuck in one of the vents read 28 deg. thats awsome....

 

The humidity would begin to start freezing on the evaporator coil if the vent temps were at 28*

What temp does that thermometer read in iced water?

if you want there are *** orifice tubes, They are a variable orifice tube and work well.
As does an adjustable clutch cycling switch. You can lower its cut-out temp.

 

i know it was too low, we had to correct that, but on another note. the humidity your talking about is supposed to be tacken care of by the dryer

 

Huh?

The humidity in question is the humidity in the air that passes through the evaorator core and ends up as conditioned air in the passenger cabin.

Evap core temps below freezing cause the core to freeze up like a chunk of ice....

Cabin air then cannot pass through that chunk of ice and frost.

Ford has been using fixed orifice tubes for years. They're cheap and extremely effective.

Steve

 

The type of orifice doesn't matter anyways; Ford went to expansion valves in 2003 on the Expedition and Navigator, and lo and behold, they started getting a bunch of complaints about poor A/C performance.

And at 28 degrees at the vents, the system would freeze up and stop cooling.