Fan Clutch Diagnosis with No Scanner - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 06-05-2019, 07:59 PM Thread Starter
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Fan Clutch Diagnosis with No Scanner

So the reason I'm suspecting this is that my AC blows ice cold when at highway speed but blows just meh at idle.I'm not getting any overheating issues based on my standard dash gauges. I've searched the forum for a way to diagnose this issue but it didn't yield much. I only found stuff about the function or replacement/swap of the component. Its my first diesel, so I don't really know how its supposed to sound (however I've spent a lot of time in diesel ambuances and I can say that they are generally louder with fan noise). Its been pretty hot outside, mid to high 80s during all of this.

Background: [ENGINE] I recently did a EGR [BPD] and oil cooler [BPD] replacement. I also flushed my cooling system with Fleetguard Restore before filling with Rotella ELC. All preemptive while into it for leaking oil, which is corrected. [AC] had the AC compressor swapped x 1 year prior. Had charge/dye approx. 1 month prior, and found system empty after engine repairs(approx. 2 weeks). Leak repaired and drier replaced (where lines connect to compressor -- replaced with Ford O-rings and drier) holds pressure. Vacuum tested and held for 30 min prior to charge. Initially overfilled by accident with 48oz where system called for only 42. Pressures were approx. low 50/high 250-275 @ 80-85 degrees, depressurized to 40/170 @ 75-80 degrees, but now not as cold with highway speed.

Should it just be loud when the AC kicks on? It really isn't as far as my experience with diesel fan noise goes. Sounds more like a light suction when I listen through the front grill than the roaring whoosh I have heard in other diesels albiet usually with some throttle applied.

I can link a video tomorrow it this isn't enough info.

2004 F350 6.0 -- First Powerstroke as of 2018

Last edited by lhejl; 06-05-2019 at 08:07 PM.
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post #2 of 3 Old 06-06-2019, 06:13 AM
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Answers:

Quote:
Originally Posted by djmaguire View Post
It;s the blue wire on the engine side of the fan clutch connector. The wire is green/turquoise/whatever on the fan side depending upon model/age/color blindness/BAC.

Shave the wire casing off (don't cut the wire) and connect it to ground. If the fan starts fanning, the clutch is good. No fanning, no worky.

Quote:
Originally Posted by Lilpooh View Post
Unplugging the EGR valve can cause fan operation issues.

The fan gets its input from the PCM, the PCM bases the fan operation off of ECT, EOT, and TFT. You need to find out what those temps are.

Sure you can test or replace the fan, but you might be chasing a ghost or wasting money on a new fan that is going to do the same thing if the above issues weren't looked at first.
Sarcasm:

Great job searching.

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Originally Posted by djmaguire View Post
So says the internet... ...and so it shall be.
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Originally Posted by G8orFord View Post
OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...
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post #3 of 3 Old 06-06-2019, 07:09 PM Thread Starter
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I gave the fan test a shot, I think the fan clutch is good. It spins either way and makes a palpable wind. I made a video, but the forum won't let me post a link unless I have more posts. I'd like a second opinion on the visual but I suppose it'll have to wait till I have more posts.

Any ideas on the AC?

2004 F350 6.0 -- First Powerstroke as of 2018
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