Air Conditioning - Compressor Working but no cold air

CaptainXL

Original poster
Member
Dec 4, 2011
2,445
Does anyone know why I would have no cold air coming out the vents even if the compressor came on and the A/C is running? I opened the hood and the clutch is engaged when I operate the A/C button in the cab. So this means that the low pressure and high pressure switches are working. So I neither have too little nor too much refrigerant in the system. Because if those switches were tripped the compressor would not engage. Correct?
 

Simon01

Member
Dec 5, 2011
116
If the compressor turns on, can you tell if the accumulator (the silver can towards the firewall) is getting cold? If it is, then you might have an issue with the temperature actuators in the dash. If the accumulator is not getting cold, then you have an AC issue. Unless you have a set of AC gauges and know how read them, I'd suggest taking it to an experienced AC tech if the accumulator is not getting cold.
 

CaptainXL

Original poster
Member
Dec 4, 2011
2,445
Simon01 said:
If the compressor turns on, can you tell if the accumulator (the silver can towards the firewall) is getting cold? If it is, then you might have an issue with the temperature actuators in the dash. If the accumulator is not getting cold, then you have an AC issue. Unless you have a set of AC gauges and know how read them, I'd suggest taking it to an experienced AC tech if the accumulator is not getting cold.

I ran the truck parked and raised the RPM's to 2000. The A/C is definitely working and it is cooler out the vents. However the clutch disengages after only running for a few seconds and then the air coming out the vents returns to outside air temp. what would cause the compressor to kick off? If I jump the low pressure switch and it still kicks off then it would seem i have a high pressure situation. Does this sound right?
 

MichEnvoyGuy

Member
Dec 3, 2011
523
Could be the low pressure switch. Mine went bad and exhibited the same behavior.
 

CaptainXL

Original poster
Member
Dec 4, 2011
2,445
MichEnvoyGuy said:
Could be the low pressure switch. Mine went bad and exhibited the same behavior.

We I drove it around today for a couple hours and it starts getting cool after about 10 minutes of driving. But I have an issue with the air temp coming out the left two vents. Its about 20 degrees warmer than the right two passenger vents. What is going on?
 

BRomanJr

Member
Dec 9, 2011
371
CaptainXL said:
We I drove it around today for a couple hours and it starts getting cool after about 10 minutes of driving. But I have an issue with the air temp coming out the left two vents. Its about 20 degrees warmer than the right two passenger vents. What is going on?


Warmer vents on the left with Dual Zone A/C is a classic case of low freon. The compressor cycling every 2 seconds or so is also a symptom of low freon if the cycling switch is good.

You're also equipped with a rear A/C unit, how is that one working?

You probably have a slow leak, unfortunately on an XL the lines to the rear are usually first to leak due to corrosion, so that may be a place to start looking.
 

CaptainXL

Original poster
Member
Dec 4, 2011
2,445
BRomanJr said:
Warmer vents on the left with Dual Zone A/C is a classic case of low freon. The compressor cycling every 2 seconds or so is also a symptom of low freon if the cycling switch is good.

You're also equipped with a rear A/C unit, how is that one working?

You probably have a slow leak, unfortunately on an XL the lines to the rear are usually first to leak due to corrosion, so that may be a place to start looking.

Thanks roman. It took two cans and its up to 40 PSI now. The air coming out is icy cold.
 

CoreyH

Member
May 5, 2014
11
Hey guys, I noticed this is an old post but I am having some issues with my A/C as well. My clutch kicks in, I have not checked the accumulator, but I did buy a can of freon and as soon as I hooked it up, the gauge on the can jumped straight up to the red "warning" indicator. When the clutch disengages it drops down to the normal zone.....what is that about? Nothing but hot air coming from the vents even when the clutch kicks in.
 

Robbabob

Member
Dec 10, 2012
1,096
CoreyH said:
Hey guys, I noticed this is an old post but I am having some issues with my A/C as well. My clutch kicks in, I have not checked the accumulator, but I did buy a can of freon and as soon as I hooked it up, the gauge on the can jumped straight up to the red "warning" indicator. When the clutch disengages it drops down to the normal zone.....what is that about? Nothing but hot air coming from the vents even when the clutch kicks in.
Hey, you look familiar! Glad you came over. Might be best if you start a new thread. Don't worry, you'll get a fast reply here.
 

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