Ac question not cooling
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More Turbo
Joined: Jan 2011
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Ac question not cooling
Ok the ac is going to tick me off. I recently replaced the condensor and noticed the orifice tube was full of metal shavings. So I replaced the compressor and dryer too. Blew all the lines out and put it back together. It cooled pretty good but wasn't cold enough. I stopped by a local quick kar and they pulled it down and I had the orifice checked and it was full of crap again. They where closing so they replaced the orifice and pulled the vacuum down and recharged. It was blowing pretty nice afterwards. Today on the freeway it quit cooling. When I slowed down it started cooling again. Does this sound like I need to completely flush everything again? It's cooling at idle but not at freeway speeds. I'll put gauges on it tomorrow...
Any thoughts? This thing it really starting to irritate me.
Daniel
Any thoughts? This thing it really starting to irritate me.
Daniel
Hotshot
Joined: Apr 2010
Posts: 19,055
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From: Saratoga Springs,UT
the system has a safty and will shutdown if either to HIGH or too LOW Pressure exists
the clutch wont put Metal in the system or do you think the clutch isnt working right causing the low cooling condition??
the Compressor Yes maybe could put metal
Im thinking its just contamination from the first breakdown honestly every time you go into it theres Metal it needs flushed better or something
the clutch wont put Metal in the system or do you think the clutch isnt working right causing the low cooling condition??
the Compressor Yes maybe could put metal
Im thinking its just contamination from the first breakdown honestly every time you go into it theres Metal it needs flushed better or something
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Joined: Aug 2001
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That's the angle I was thinking.. an overcharge which is exagerated at higher engine RPMs. The A/C sensor sees too high of pressure and shuts the system down.
Which could be said about a low charge as well, higher rpms and there is less to pump thru the system and you get warm air.
The third angle is with the a/c compressor clutch not holding at higher rpm. (High RPM being relative given this is a diesel after all) Being a new or rebuilt compressor it's hard to say whether the clutch is any good and whether the air gap was set properly.
Easiest is to see where the pressures are and go from there. If it cooled fine on the highway at first and then got progressively worse I would target a low pressure problem and possibly a leak.
Josh
Which could be said about a low charge as well, higher rpms and there is less to pump thru the system and you get warm air.
The third angle is with the a/c compressor clutch not holding at higher rpm. (High RPM being relative given this is a diesel after all) Being a new or rebuilt compressor it's hard to say whether the clutch is any good and whether the air gap was set properly.
Easiest is to see where the pressures are and go from there. If it cooled fine on the highway at first and then got progressively worse I would target a low pressure problem and possibly a leak.
Josh
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
wonder if it throws a DTC for pressure problem
and if it was full of metal again probaby wouldnt have A/C at ALL
Seems like 35psi on the low side rings a bell A/C ON truck at Idel I could be off to
Are you filling it with Lube to right not just 134a Freon
and if it was full of metal again probaby wouldnt have A/C at ALL
Seems like 35psi on the low side rings a bell A/C ON truck at Idel I could be off to
Are you filling it with Lube to right not just 134a Freon
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I don't believe there is a DTC for a/c.
Josh
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Fleet Owner
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From: Spanaway
I just hope that the OP did a flush of all the lines
before putting the new compressor in. It he is finding
metal shavings in the 2nd orifice I would worry that
some thing got missed.
Sean
before putting the new compressor in. It he is finding
metal shavings in the 2nd orifice I would worry that
some thing got missed.
Sean
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Hotshot
Joined: Feb 2003
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From: Long Beach, Ms.
I've had the AC clutch of my work truck fail twice in the past 4 years.
The cooling failure at highway speeds was the primary symptom.
Slowing to idle would return the clutch to a speed where it would grab and spin up the compressor.
The cooling failure at highway speeds was the primary symptom.
Slowing to idle would return the clutch to a speed where it would grab and spin up the compressor.
Junior User
Joined: Aug 2005
Posts: 65
Likes: 0
From: Atlanta
I had a similar problem. I could not figure it out, so I took it to the dealership. It took them awhile to figure it out too. Turns out the dryer bag broke filling the system with desiccant. They had to evacuate and clean the entire system to get all of the desiccant out. The desiccant would plug the orifice. I believe this isn't common, but it was expensive to repair. I am no expert on this, but I hope it might help you.
Fleet Owner
Joined: Apr 2012
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From: Spanaway
Crap that gets into the system no mater how is a PITA.
You need to disassemble as best as you can and use a
solvent flush system ment for auto A/C systems. You
flush till clean and then reassemble and pull a vacuum
and hold it for X hours. (X comes from the manufacture of the solvent)
when you sure it all good then you move onto the refill process.
Sean
You need to disassemble as best as you can and use a
solvent flush system ment for auto A/C systems. You
flush till clean and then reassemble and pull a vacuum
and hold it for X hours. (X comes from the manufacture of the solvent)
when you sure it all good then you move onto the refill process.
Sean
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