AC only working when I am driving - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 07-10-2013, 03:12 PM Thread Starter
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AC only working when I am driving

So here is the skinny:
When I drive AC works fine awesome cold as can be.

When I parked for lunch the other day I noticed the AC stopped blowing cold air. What the heck? It has done it a couple of times now, but today while I was parked it stayed cold.... So I don't know if there is something starting to fail or what. But I always have a puddle under my truck so the line is getting cold and the compressor must work if it blows while I am driving right?

Also not sure if this means anything but every so often I will check my DTC on my insight and every so often I will get the P0528 code for fan speed circuit. But not always if I clear it, it will stay off for 500-1000 miles but pop back on. Not sure if that has anything to do with it. I call the dealer about it and they said that when I turn the truck on if the fan is spinning it is getting a signal that is why it is not throwing a hard code and only a soft code...Not sure what to think about that. But my ECT stay 190-196 depending on if it is stop and go.

your thoughts guys?

Sean
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post #2 of 17 Old 07-10-2013, 05:17 PM
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mine was doing approx the same thing. thought something was broken, then turned down the temp a couple degrees and everything has been fine since.don't know if this will be your cure but i haven't had any problem since.

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post #3 of 17 Old 07-10-2013, 05:22 PM
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mine has done the same thing i did what the above poster did and it helped mine

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post #4 of 17 Old 07-10-2013, 06:32 PM
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If you have your EGR valve unplugged, that will cause your fan speed code. Low fan speed is gonna cause A/C issues at idle because it isn't spinning fast enough to draw air across the condenser.
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post #5 of 17 Old 08-28-2014, 05:08 PM
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Anybody else have anthing? I've noticed the same symptoms as the OP since summer started.
Mine only has real good cold air on rainy or cloudy days or cool mornings. When it decides to work on a sunny day, it's just cool enough(with a trick).

-Watched my fan speed today with ac on. Never saw over 900rpms on the fan. At idle with ac, fan speed is anywhere from 380-500rpm, usually on the lower end. At idle with ac off it seems to stay in the mid to low 300 range usually. Driving with ac, fan speed would hardly change, just hold in the upper range of 380-500, sometimes higher.

-I have no overheating issues at all. EGR is stock and connected and cleaned recently. Towed my boat(~8500 lbs) real hard last weekend seeing what temps would do. Got up to max of 216 oil and 208 coolant, oil would come down to match coolant and build back up.

-Weird thing here. I'm in an Excursion with rear a/c. When only the front is on, it rarely gets cool enough. I switch on the rear a/c, rear vents blow out cooler, and then the front vents start blowing cooler, which is what makes this bearable.

-While towing, the ac blows warmer then when empty. Just started noticing this 2 weekends ago.


Hopefully someone reads all this. Thank you. Any Ideas?!? Is it worth the money putting in a new fan clutch? I have an appointment to get it done, just not sure if the $400 will make any difference here. I'm planning on finding an ac place to check out the refrigerant tomorrow to rule that out.

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Last edited by johnnybgood; 08-28-2014 at 05:14 PM.
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post #6 of 17 Old 08-29-2014, 06:04 AM
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One of my pulleys started locking up. Ac wpild barely work when stopped. Not enough toque on it.

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post #7 of 17 Old 06-06-2019, 06:26 PM
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I have had the same symptoms since I had my AC recharged about a couple of weeks ago. I had the truck down for 2 weeks while I was redoing the EGR/oil coolers. Had a leak at the compressor to AC line flange (crappy black rubber O-rings). Fixed the leak and replaced the drier -- since I didn't know how long it'd been empty. It makes and keeps pressure.

I'm tried the fan ground test (blue/green wire to ground) and the difference was hardly noticeable from having the thing unplugged entirely. However I think its fine. I don't have a scanner, so I'm really flying blind.

Other ideas I had was possibly a caked up evaporator? I'm not exactly itching to get in there to see if there's any problem in the air box though yet till I explore some other options. I think there may be a sensor in the air box but I've not confirmed that yet.

It's been a long time since the last post on this thread, but I imagine a few people are going to be running into this as it is getting warmer this time of year.

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post #8 of 17 Old 06-07-2019, 02:48 AM
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This opinion is just from basic ac, so take it for what it’s worth. Put a set of manifold gauges and see what the pressures are. If you don’t have a set, you can get a can of Freon from Walmart and the cheesy gauge will give you an idea of your refrigerant level. If you’re idling, pop the hood and see if the compressor clutch is engaged or cycling. That will also tell you if you’re low. Ac cold while driving and not at a stop is typically indicative of an air flow problem if everything else is up to snuff. You need air moving over/through the condenser whether it’s from the fan or from driving. If Freon charge is good, and fan working properly, then we need to go a bit deeper.

Edit: when I had my truck studded the ac wasn’t always cold. Sometimes it would just stop blowing cold air. I checked the Freon, and the shop had overcharged the system. After I put it where it needed to be, it’s working fine.

Last edited by Jjorgis5569; 06-07-2019 at 02:55 AM. Reason: Info
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post #9 of 17 Old 06-07-2019, 06:20 AM
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Well, I cant post links yet but I did post a video to youtube of what is going on on my rig.

the address is : watch?v=csS-byYjLeE after the slash @ youtube.

I cant see any obvious fan operation issue but I may be wrong, would love a second opinion

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post #10 of 17 Old 06-07-2019, 09:24 AM
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