Automotive Air Conditioning Information Forum (Archives)

rollerstud98 on Wed August 11, 2010 7:16 PM

Year: 2003
Make: Ford
Model: F350
Engine Size: 6.0
Refrigerant Type: R134A
Ambient Temp: 27* C

Like the title says, I have an intermittent ac function. In the morning when I start my truck the air will start blowing nice and cold, probably lasts about 20 minutes and then starts to get warm and very humid feeling. When the ac is working the lines going to and from the evap can are fairly frosty but there is no water coming out of my evap can. Should add that once the air is hot, the lines to and from the evap are very hot. I have just recently replaced the condenser and therefore just had the system recharged and there are no obvious leaks from anything. Replaced the sensor on the evap can last year or so with no difference to function. Also have tried using a jumper on the harness and had the same results with the cold air turning warm. If I unplug and then plug that sensor back in I can hear the motor change as the compressor is kicking in I believe, can not actually hear the compressor itself over the sound of the motor.


If I leave the truck for a couple hours then start driving again, the air will start warm but after a couple minutes will all of a sudden start blowing cold again but only for a short period of time, again no water draining happening.

Edited: Thu August 12, 2010 at 2:15 AM by rollerstud98

Mudshack on Thu August 12, 2010 9:31 AM

Sounds like the condensor might be freezing up. Have you put a guage on the low pressure side to see what the pressure is while the A/C is actually blowing cold?

My house A/C actually froze up when the refrigerant got low.


Throw a guage on the low pressure side (the fill nozzel) and let us know what the reading is when it is blowing cold, and when it is blowing hot.

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1999 Jeep XJ Sport

rollerstud98 on Sun August 15, 2010 11:19 PM

I will do that, I don't have any gauges or of the equipment now and hot season is coming to an end here so I may just wait it out another year as it has been 2 or 3 already anyways.