Ok 5A it is for the relay coil.

I'll see if I can find a p/n on the fan.

The fan I have is a single fan, so maybe it didn't come out of what I thought?

It has what looks like some ballst...

I'm not sure exactly what the fan is from as I bought it from a friend several years ago. I believe it came out of like a 2001 cadillac of some sort.

I'll get a fuse holder and several fuses in...

I'm going to pick up some inline fuse holders on the way back home today to complete the install. What size fuses should I use for each of the two wires going to the + battery post?

Awesome



He's on this forum isn't he? What is the best way to get in touch with him? I certainly don't intend to complain as I am very appreciative of the work he's done! Just want to help!

After testing the efan in the driveway I burned a chip with the fan set to turn ON @ 204.4 and OFF @ 203. Went driving around town and saw temp starting to come up to the 204 mark so I hopped out,...

Here's how I have it wired as of now:

30= BATT +
85= PCM PIN E3
86= BATT +
87= FAN

This IS different from the way the wiring is listed in the .doc included with the efan control patch for...

Ok I just realized something that might be my problem. The included .doc with the fan code for $OD has something at the very bottom for wiring directions. This is what I've been using, but I see now...

Thanks for clarifying that.

I set fan on to 70.7 and fan off to 69.4 to try and force fan on to test it but it still doesn't work. Any idea what I'm doing wrong?

Maybe somebody could take a...

Does anybody have any ideas? I recall finding a post by 93V8S10 where he talked about some of the '7427 PCMs used in HD applications had pin E3 setup differently, therefore the efan code might not...

I wired up the fan to the PCM but it won't work. Followed directions exactly as prescribed in the included document file with the patch. I set the fan enable temp low to like 40 F to test if the PCM...

Yes, I know TunerPro has a built in hex editor.

But like I said, I couldn't get it to work for copying and pasting the code itself into the proper addresses in the binary.

I typed it all in...

Thanks Robert,

I'm going to try that method next time I boot into the Windoze side of my HDD and have access to TPRT.

Did anybody check out that hexeditor I found? Pretty neat I thought. I was...

When I go to patch in TP it wants to open up an 'Srecord', what do you do there?

I found a free hex editor on the net last night. I was able to copy and paste it just fine using that hex editor. Open the new bin in TunerPro and it appears as if the efan code was installed...

Thanks. How come when I try to copy the code at the bottom into the hex editor it pastes all wrong?

After googling around for 7427 E fan control I found this:

http://www.fullsizechevy.com/forum/general-discussion/performance/tbi-tuning-87-95-obd-i-ecm-pcm/446107-new-electric-fan-code-0d.html
...