Fans cutting on intermittently,

[BIGG]

Big G here ,I have a 2010 SHO, my fans are not always cutting on causing the temp. to rise and I have to pull over and let it come down. Then other times it will come on while I'm just sitting. Went a week with no issue, then started again today. Anyone have this issue or know what the issue could be.
Also I know they run hot but where are we at with normal operating temperature. I'm around 210 normally.
Thanks..

 

[kryptto]

ney welcome, best to post this down in gen4 to get eyes. first question are you getting any lights and have you scanned for codes?

next the fans do have issues there is a relay but possibly thermostat do a search well have many threads to start with.

 

[BIGG]

Thanks, no codes present. No mil lamp. Totally random defect.

 

[kryptto]

Thanks, no codes present. No mil lamp. Totally random defect.

here ya go... my diagram is from a 14

 

[Shortbus Commando]

Did the wiring change in 2014? I have a 2011, and I'm not seeing the same thing on mine.

 

[Texas Marauder]

2011 Cooling Fan

 

[Shortbus Commando]

I checked power to the relay, 12.4v, and power on the signal is3.54v when the fans are off. When I step up the signal on my diag the voltage drops about 0.5v per 10% signal. Any signal above 90% and the fans cut out (max signal is 93.99%). I've replaced the cylinder head temp sensor and the fan relay, twice, with the same result. I'm getting power, my ground seems good. Why would I be losing signal at max?

 

[Texas Marauder]

Perform the KOEO and KOER tests. If there are no DTCs the system is working correctly. Listen for the fans while performing the tests. It's possible that the fan motors are going bad. Not being able to run the fans at 100% is not necessarily a problem.

 

[Shortbus Commando]

The problem is that the plc outputs a max signal and shuts off the fans, causing the car the overheat. What is the KOEO and KOER?

 

[Shortbus Commando]

I ran the tests, and when running the cooling fans did turn on during the test, but then turned right back off after. What temp are they supposed to come on at?

 

[Texas Marauder]

I ran the tests, and when running the cooling fans did turn on during the test, but then turned right back off after. What temp are they supposed to come on at?

Approx 210. Do the fans run with the A/C on?

 

[Shortbus Commando]

No, they don't

 

[Shortbus Commando]

No, they don't

I did buy a cheap relay. Could it be that you need to run an OEM relay for it to work correctly? O have ran into that before, I just want to make sure before I pay for another part that I may not need.

 

[Shortbus Commando]

So update. I did get it working again (so far anyways), and it looks like it was the cheap Chinese fan controller was the problem. I wasn't getting anywhere with it, so I took apart the original and one of the cheap ones to see what difference there was. It is definitely a case of you get what you pay for in this instance. The components looked very flimsy, the capacitors (plural in this case, versus one on the original) were smaller each, and the circuit board was not only larger, but you could tell the components were inferior. I ended up getting the Gates FCM128 control module, and so far it is working great. My a/c even feels colder.
Now I know everyone will probably roll their eyes and say "duh, you never use cheap parts", but lets be real here guys; I've used plenty of Chinese parts that have worked fine over the years, (most of the parts are produced there anyways, whether you want to believe it or not), but in this case, don't skimp when it comes to electronics. This will be a lesson learned for me; sometimes you have to pay for quality.

 

[kryptto]

This vehicle is an electric pig and unfortunately requires the best parts. The difference I have seen even though the parts is made in China or wherever is the vendor specs. That is where OEM more times that not dominates the knock off companies. Just my humble opinion reading these threads.