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Ac blows cool but not cold

B-Train

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Vehicle Year
1993
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Ford
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Hey I’ve got a 94 ranger 4.0 4x4, the AC compressor cuts on and stays running at idle, but cycles quick while driving. It blows cool but not cold as it should. The gauge shows the low pressure side at 40 psi. Everything seems to be working but not blowing extremely cold. Orifice tube is ice cold to touch, I’ve checked other posts on here and cannot figure out what’s going on, thanks in advance
 


RonD

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I would pull off/out the Blower Fan motor in engine bay and reach in and feel the Evaporator fins, see if there is any debris blocking part of it
You can also start the engine and run the AC, then feel if the whole Evaporator is cooling down, "icy cold"

1994 uses a slider switch with cable to operate the Blend Door, the TEMP control slider
The Blend Door routes the air from the blower/fan either thru the Heater core(HOT), or around the Heater core(COLD), or anywhere in between
AC can only go down to 35degF, or it can freeze internally and stop working, so it generally stays at about 38-40degF
Heater core is at 190degF

So any leakage at the Blend door would heat up the air coming out of the vents pretty quick, lol
Easy to check this
Warmed up engine, Turn AC off
Slide blend door control to COLD
Fan on HIGH
Should be outside air temp coming thru the vents
Slide control to HOT
Should get hot air coming out
Slide it back to COLD
Should cool off right away

There is an adjustment for TEMP slider, its above glove box
Fold down glove box all the way, pinch the sides
Look on top of the "air box" you will see the cable
Move the slider and you can see it moving the Blend Door arm
There is a screw that holds the cable's sheath, thats the adjustment
 
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Eddo Rogue

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skyjacker front leveling kit
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I am having this same problem and was hoping Ron would reply. I took a pic of this page on my phone for quick access when I am at the ranger lol. Thank you both.
 

B-Train

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Yeah I was reading yours and was hoping for a solution on one of them. Thank you RonD for the quick reply, I’ll check the evaporator tomorrow, it’s bamboozled me enough for today !! Lol
 

TrackAire

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Explorer 4x4
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Hi Ron,
I have a 1993 Explorer and am having the same issues with cool but not cold ac. Is the 1993 the same as 1994 when it comes to adjusting the temp slider?
Also, if I remember correctly the 1994 trucks starting using some sort of vacuum operated diverter valve to keep hot coolant from going into the heater core when the a/c is turned on. 1993 and earlier trucks did not have this. Is this something that would help make the AC more efficient and cooler? It doesn't look too hard to install. Thanks in advanced.
 

RonD

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Yes, sliders use cables in all Fords, Knobs are vacuum or electric

My 1994 Ranger 4.0l can't use a single hose valve because the flow is needed from intake back to water pump or you get random overheating
I know this because when my heater core starts to get clogged up the temp gauges starts to go above 1/2 then back down randomly, lol

A 4 hose by-pass valve could be used because flow to water pump is maintained

Heater core is 180deg, so even if air is not passing thru it(blend door closed) it will still radiate some heat in the cab
So by-passing it would allow it to cool off and not radiate as much heat inside the cab
Might help buy a few degrees cooler, but not alot
And if Blend Door was not sealing, closing all the way, it would help more since core is no longer at 180deg

The main benefit of MAX AC is cutting off outside air when its 90+deg outside
If AC can cool 90deg air down to 70deg
Then it would cool 70deg air down to 50deg

So if you recirculate the already COOLED AIR from the cab back thru the AC(evaporator) it makes the AC more efficient
 

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