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Radiator Fan Troubleshooting

 
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  #1 (permalink)  
Old 21 Nov 2014, 11:06 pm
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Default Radiator Fan Troubleshooting

Well, I looked through most of the threads for this problem and also looked on line now for about two weeks and I am at wits end. I just got through replacing my heater core, got that all back together, bled the system, filled with correct fluid, test drove and while sitting waiting for my daughter, I get the familiar bubbling in the overflow bottle noise. So after going through the usual suspects, reading the forum, Googling it, I finally narrow it down to the fan not coming on, so before I just throw a part at it I troubleshoot EVERYTHING, wiring,PCM to PDC, PDC to fan, voltage from PDC to ground, voltage from Run-Start Fused B+ to ground, ringing out all wiring, no opens or grounds, checking for voltage,checking the relays, swapping the high speed relays, checking the fan at the fan connector and by jumping the relays in the PDC, which by the way worked although the low speed died while I was checking it. The ECTS was good, the temp was verified with a borrowed Genisys Scan tool and it coincided with what was reading on the temp gage, yet at 199 when the fan was supposed to come on it didn't, so that kinda ruled that out of the question, unless the PCM isn't seeing the voltage from the ECTS, but I checked the wiring and the scan tool is reading the voltage. The thing that bugged me was that although the low speed was dead, I could never get the high speed fan to come on at all, whether it was with the scan tool or getting to car to above normal temp. I must have read the wiring diagrams until I was blue in the face and the high speed fan is on it's own circuit with the control ground provided by the PCM, it has nothing to do with the low speed fan circuitry, at least not on paper. So I buy a new fan assy hang it on and run the test, okay the fan comes on, that bugs me because I couldn't read any voltage at the fan connector prior to this although I clearly could hear the low speed relay clicking. I should at least have seen a spike in voltage. But anyway, it still bugs me, so I run the high speed relay test and the low speed relay clicks,REALLY???? but the fan comes on. So to satisfy my curiosity I pull the high speed relay, run the high speed test and the fan comes on, so I know the high speed portion either is not working or the scan tool is only running one test although it states it is running two. So now I will install the fan assembly and get it up to temp and see if the PCM turns the fan on at all. So after all this rambling my question to those of us who have trouble shot this problem before, it comes down to two things, either the ECTS is bad, although I highly doubt it or the PCM is not providing a ground at all to either relay for the fan, has anybody ever seen this before? I'd really like to know before I purchase a "new" PCM
Some info about me, I am no stranger to troubleshooting , I work as a technician in line maint for a major airline, and EEC replacements on our engines almost never fix the problem at hand, so before I go for an PCM I want to make sure that is where the problem is. Any help or insight to how this circuit is really supposed to work would be great. Like we say at work all the time "It's really just a simple circuit" Yeah right, simple circuit my foot. . . I'll post what I find after my test drive.
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Old 21 Nov 2014, 11:34 pm
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Default Re: Radiator Fan Troubleshooting

If I read your post correctly, you have a new fan and it works, but it's operation seems to be against the way it ought to work???
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Old 22 Nov 2014, 12:03 am
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Default Re: Radiator Fan Troubleshooting

turn your AC on and high speed should run on fan
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Old 22 Nov 2014, 12:15 am
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Default Re: Radiator Fan Troubleshooting

Xwing777-Fan does not run with A/C on, Quicksilverdon, yes, kinda, I'll know more tomorrow after I test drive it, as of now running the hi-speed portion of the test through the scan tool the fan only runs on low speed or one speed. With the old fan I could not get it to run at all, even though when I jumpered it through the PDC it did run on high.
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Old 22 Nov 2014, 01:03 am
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Default Re: Radiator Fan Troubleshooting

If your still having a problem, look inside the fan connector, inspect the plastic where the male and female go together for heat damage, melting-burn marks.
Since you changed the fan the male ends SHOULD be good.

Upon inspection my ground (center pin) had heat damage and would work sometimes. I ran a ground directly to the battery, no more problems. OR you might jumper around the bad connector if that is the case.
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Old 22 Nov 2014, 01:12 am
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Default Re: Radiator Fan Troubleshooting

Hi Joe,
Thanks for the info, that was one of the first things I did, while I was jumpering to the fan leads. I then jumpered it through the PDC. And once again tonight I inspected it again just to make sure I didn't miss something.
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Old 22 Nov 2014, 07:54 am
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Default Re: Radiator Fan Troubleshooting

If you find an intermittent ground, there are several engine grounds located on the left fender in one eyelet, I had a problem with 02 sensor and found the ground to be the actual problem.
The copper eyelet had a zinc coating which conflicted with copper wires and oxidized them causing bad ground.

I know you have an 02 , my 06 also had a harness connector under the battery mounting bracket which also goes to the left fender grounds.
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Old 22 Nov 2014, 08:11 am
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Default Re: Radiator Fan Troubleshooting

Contact Santanadaharma. Hes is good on electricals . Maybe he can answer your question. If the PCM is getting the correct temp and still dosent turn on.
I think you problem is elsewhere.
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Old 22 Nov 2014, 10:05 am
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Default Re: Radiator Fan Troubleshooting

Will do, and that's a very good possibility also, but the wiring diagrams don't really show that. I'll have to see what other inputs the PCM gets that relate to temperature and what the outputs are, and then check and see if those parameters are within spec. Thx
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Old 22 Nov 2014, 01:30 pm
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Default Re: Radiator Fan Troubleshooting

First thing I would ask is are you currently getting any engine trouble codes and if so what are they?

Last edited by ptcruisersteve; 22 Nov 2014 at 01:33 pm.
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