• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' the posts that you read.

AC intermittently blows warm


Old68mustang

New member
Joined
Sep 10, 2020
Messages
3
Reaction score
1
Points
3
Location
Texas
Vehicle Year
2001
Make / Model
Ford Ranger XLT
Transmission
Automatic
When cruising for long period the AC will start blowing warm air. Kicking it to WOT then back to cruise speed will usually cure it but sometimes have to do it several times.
 


Rock Auto 5% Discount Code: 4FF3E9EEA14805 Expires: October 1st, 2020

RonD

Well-known member
Joined
Jun 2, 2012
Messages
16,550
Reaction score
2,121
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Check to see if the AC tubes are freezing in the engine bay on the heater box
That would mean you are low on "Freon", and its getting TOO COLD so flow inside the tubes stops until it "unthaws"

Could also be one of your pressure switches is failing, opening and then not closing right away when pressure is correct again

And then there is the PCM, the computer, it is what controls the AC
It has a "relay" inside it that you activate using the dash AC switch, demand signal
PCM then connects pressure switches(the ground) to the AC relay which then turns on and sends 12v to AC Clutch

When you press gas pedal to the floor(WOT) PCM turns off that internal "relay" to shut off AC for more power from the engine, which is the point of WOT

Now, since WOT seems to reset it then it may be a computer issue, but very very hard to diagnose that and the least likely issue
 

Ranger850

Well-known member
Supporting Member
TRS 20th Anniversary
Joined
Jan 24, 2018
Messages
4,843
Reaction score
1,424
Points
113
Location
Tallahassee Florida
Vehicle Year
2001
Make / Model
Ford
Engine Size
Born with a 3.0, looking for a donor V8
Transmission
Manual
2WD / 4WD
2WD
Total Lift
Stock 2"
Tire Size
Stock
My credo
Doing things wrong, until I get it right.
I had a Taurus that did this exact thing. AC worked intermittently. Replaced the A/C relay/fuse (?) under the hood and all was fixed.
 

JerryC

Member
Joined
Apr 10, 2014
Messages
206
Reaction score
17
Points
18
Location
Tennessee
Vehicle Year
1988
Make / Model
Ford
Engine Size
2.9
Transmission
Automatic
I have friend that had a similar symptom with his older Grand Cherokee. His mechanic said it was nearly clogged orifice tube.
 


Top