A/C issues
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New User
Joined: Mar 2011
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Update:
I topped off the refrigerant (added a little bit at a time, until it was blowing cold). In town, it blows very cold. Head out on the highway, and the compressor switches off, and won't come back on. Sitting in the parking lot, I can hang meat in here.
This really has me scratching my head. Could it be a bad relay that's shutting off the compressor at highway speeds?
I topped off the refrigerant (added a little bit at a time, until it was blowing cold). In town, it blows very cold. Head out on the highway, and the compressor switches off, and won't come back on. Sitting in the parking lot, I can hang meat in here.
This really has me scratching my head. Could it be a bad relay that's shutting off the compressor at highway speeds?
Fleet Mechanic
Joined: Dec 2015
Posts: 1,521
Likes: 412
From: Washington Coast
You need to get a pair of pressure gauges to read high and low pressure sides. The gauges on the cans are crap. If you filled it till it blew cold you’re probably overcharged and that’s as bad or worse than low charge as it can damage components like the compressor shaft seal. If it’s overcharged it won’t cool as you have to have the pressure differences while it’s operating or no heat transfer.
There is also a temperature bias you have to account for or you could be over or undercharged still.
There is also a temperature bias you have to account for or you could be over or undercharged still.
Tuned
Joined: Apr 2001
Posts: 417
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Update:
I have a 2004 F250 4x4 crew cab, with a 6.0L PSD. The air conditioning has started cutting in and out, and not cooling as well as it should. I checked the refrigerant level, and it appears to be in the middle of the charged zone. I'm wondering if I have a relay that's failing, or something else going on.
This really has me scratching my head. Could it be a bad relay that's shutting off the compressor at highway speeds?
I have a 2004 F250 4x4 crew cab, with a 6.0L PSD. The air conditioning has started cutting in and out, and not cooling as well as it should. I checked the refrigerant level, and it appears to be in the middle of the charged zone. I'm wondering if I have a relay that's failing, or something else going on.
This really has me scratching my head. Could it be a bad relay that's shutting off the compressor at highway speeds?
Same symptoms of the air gap on the clutch plate being too large. Again, look into that.
It's not engine/model specific. Mine's a v10 and the plate had worn enough to increase the gap. Reshimming fixed it and I have cold air at all speeds now.
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I'll have to find time and $$$ to get to a shop.
Still, this doesn't explain why it won't cool at highway speeds, but will freeze me out in stop and go traffic. Sitting and idling will also freeze me out.
I had a similar situation on our Honda Odyssey, and it turned out to be a bad relay, which is why I asked about that earlier. I'll have to take a day off and take it to my friend's shop. He doesn't work on diesel, but A/C should be something they can handle.
Still, this doesn't explain why it won't cool at highway speeds, but will freeze me out in stop and go traffic. Sitting and idling will also freeze me out.
I had a similar situation on our Honda Odyssey, and it turned out to be a bad relay, which is why I asked about that earlier. I'll have to take a day off and take it to my friend's shop. He doesn't work on diesel, but A/C should be something they can handle.
Tuned
Joined: Sep 2006
Posts: 436
Likes: 51
From: Southwest WA
Update:
I topped off the refrigerant (added a little bit at a time, until it was blowing cold). In town, it blows very cold. Head out on the highway, and the compressor switches off, and won't come back on. Sitting in the parking lot, I can hang meat in here.
This really has me scratching my head. Could it be a bad relay that's shutting off the compressor at highway speeds?
I topped off the refrigerant (added a little bit at a time, until it was blowing cold). In town, it blows very cold. Head out on the highway, and the compressor switches off, and won't come back on. Sitting in the parking lot, I can hang meat in here.
This really has me scratching my head. Could it be a bad relay that's shutting off the compressor at highway speeds?
Have you measured the AC compressor clutch air gap (about .020" I think is where it should be)?
Fleet Mechanic
Joined: Jan 2016
Posts: 1,804
Likes: 113
How do you know the compressor isn't engaging on the highway?? FWIW, if you over gassed it then it will go out on the high head pressure switch and the clutch won't engage.
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How do I know it's cutting out at highway speeds? Above 50mph the AC stops blowing cold. Below 50, it will freeze me out.
When I charged it, I added a little bit at a time, until I felt it get cooler. Prior to charging, it never got truly cold in the cab, at any speed. Now, at low speeds, it gets cold. Once I hit 50, not so much.
As I said, I'll have to find time and money to get her to the shop, or at least a set of gauges to check the pressures.
When I charged it, I added a little bit at a time, until I felt it get cooler. Prior to charging, it never got truly cold in the cab, at any speed. Now, at low speeds, it gets cold. Once I hit 50, not so much.
As I said, I'll have to find time and money to get her to the shop, or at least a set of gauges to check the pressures.
More Turbo
Joined: Feb 2004
Posts: 722
Likes: 22
From: New Orleans to San Diego
I have same issue
So the 7.3 airgap is easy to set as the compressor is on top of motor. The 6.0 compressor is burried deep down. Have any of you felow 6.0 guys had any luck removing shims from the compressor clutch end cap and how did you do it without removing fan shrouds?
More Turbo
Joined: Feb 2004
Posts: 722
Likes: 22
From: New Orleans to San Diego
I have same AC issue on my 6.0
Tuned
Joined: Sep 2006
Posts: 436
Likes: 51
From: Southwest WA
Is there any way to get this type of wrench on it?
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