AC Help Needed!
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4th Gear
Joined: Jun 2025
Posts: 4
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AC Help Needed!
2013 F250 6.2 had a few leaks. Shop decided to replace the AC lines and condenser. Still leaked to we determined it was the evap. In the meantime while waiting for a shop to get me on the scheduled, I went on ahead and refilled with some freon and noticed my AC wasn’t as cold as it USED to be…. didn’t think much of it. I ended up getting the EVAP core replaced and that cured the leaks. Shop vacuumed and filled the R-134 to proper specs… STILL the AC does not blow as cold as it used to be. The PSI is in proper range. When idle…. blows semi cold and on highway it blows colder but not ice cold as it USED to be. We then decided to replace the AC Compressor- SAME RESULTS. The low pressure line and evap is dripping with condensation but it’s still not as cold as it used to be coming out the vents. I’m leaning towards possibly the new condenser being the issue. Any thoughts?
More Turbo
Joined: Oct 2023
Posts: 607
Likes: 153
From: Canada
The Gas quality itself could be poor. If they drained all the pag and the machine is calibrated and the gas level is correct and properly leak tested it has to be the gas. When serviced they need a little dessicant filter changed, new O rings and new shcraeder valves. And the cabin air filter needs to be fresh. That dessicant filter can effect performance if fouled.
More Turbo
Joined: Oct 2023
Posts: 607
Likes: 153
From: Canada
All local shops would be getting gas at the same place. But if you already changed all the parts and used 3 different shops then I can't think of a reason other than maybe a temperature sender is sending faulty readings and disengaging the compressor clutch prematurely. Not sure it would on max tho. Guess I would manually power the compressor clutch and measure if it gets colder than baseline. Leave it engaged for several minutes. Or swap the sensor if it's cheap and in an easy spot to get at. Not sure how that system works. Clogged dessicant tube would be my next guess. But I'm sure they would have looked. Shraeder valve could leak. But they check. There could also be a fault in the pressure sensors. Change both.
So if I'm stuck and just guessing and don't have tools to check exact values. Pressure sensors and the interior temperature sensor. i haven't fixed an AC system in 7 years.
So if I'm stuck and just guessing and don't have tools to check exact values. Pressure sensors and the interior temperature sensor. i haven't fixed an AC system in 7 years.
Lead Driver
Joined: Jun 2004
Posts: 6,356
Likes: 593
From: Amarillo, TEXAS!
Is the compressor cycling or staying engaged most of the time? At 100 ambient, I'd think the high side would be a little higher than that. Can you get to the expansion valve at the firewall and give it a little tap or two and see if anything changes? The pressure line going to the txv should be pretty hot. Is the tube on the suction side of the evap coil cold, cool or warm-ish?
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Laughing Gas
Joined: Oct 2007
Posts: 964
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There is a filter online going into the evaporator .
it should be changed whenever the system has been opened .
it is a screen like fiter that sits inside the line .
I had a heck of a time finding it on my 99 v10 .
it should be changed whenever the system has been opened .
it is a screen like fiter that sits inside the line .
I had a heck of a time finding it on my 99 v10 .
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4th Gear
Joined: Jun 2025
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Is the compressor cycling or staying engaged most of the time? At 100 ambient, I'd think the high side would be a little higher than that. Can you get to the expansion valve at the firewall and give it a little tap or two and see if anything changes? The pressure line going to the txv should be pretty hot. Is the tube on the suction side of the evap coil cold, cool or warm-ish?
Lead Driver
Joined: Jun 2004
Posts: 6,356
Likes: 593
From: Amarillo, TEXAS!
If you're talking about the orifice tube, his truck doesn't have one.
Lead Driver
Joined: Jun 2004
Posts: 6,356
Likes: 593
From: Amarillo, TEXAS!
If it was a crappy condenser, I'm thinking it would drive the high side pressure higher. But, if it's a different design than OEM, it might use a different refrigerant charge amount. Even though I got my condenser from a dealer, it's redesigned and calls for about 8 ounces less refrigerant than stock.
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