Evaporator freezing up


automile

New member
Joined
Jul 2, 2019
Messages
2
Reaction score
0
Points
1
Location
cleveland ohio
Vehicle Year
2011
Make / Model
Ranger
Transmission
Automatic
I have a 2011 Ranger that has had great ac till just a few weeks ago. Now the compressor doesnt cycle off and the evaporator seems to freeze up.if you turn it off for 10 min or so it goes back to blowing cold air till it freezes again. cold it be a bad low pressure switch? if so are the on a schrader valve or do I need to open the system up? thanks everyone!
 


Rock Auto 5% Discount Code: 173A8B749AB83C Expires: January 1, 2020

adsm08

Well-known member
Supporting Member
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
31,905
Reaction score
1,240
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
A low pressure switch that is shorted does sound likely. It would be best if you could get some gauges on it and see what the low side is doing.
 

Uncle Gump

Well-known member
Supporting Member
Joined
Sep 17, 2018
Messages
1,382
Reaction score
587
Points
113
Location
Plano IL
Vehicle Year
2006
Make / Model
Ford
Engine Size
4.0L
Transmission
Automatic
2WD / 4WD
4WD
My credo
Lead, Follow or get out of my way
I do believe most are on a schrader valve.
 

RonD

Well-known member
Joined
Jun 2, 2012
Messages
13,747
Reaction score
533
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Yes, as odd as it sounds low levels of "freon" cause freeze up

AC works by compressing "freon" then allowing it to expand, the more and faster it expands the colder it gets, so when system gets low on "freon" it can expand more and faster

Low pressure switch should prevent that, but could be stuck or right at the edge of shut off
 


Top