Read sentence 1. It's the 2pin, Mike.

 

I thought that pin 33 was used for ac fan operation...I know that there's a thread around here that explains it, I'll see if I can find it. I believe that ac pressures as well as commanding the compressor on comes into play, but I'm not 100% sure. It could very well be a sort of low fan/high fan thing. The factory pin 33 had something to do with recirc operation or something like that I dunno, I have the 1 pin harness lol.

I called you back Tom, did you get my message?

 

On my 04:Both pins should be empty, you shouldn't have to remove another pin. There are two 33's and two 42's. The plugs going into the PCM are a clear transparent color. If I remember right it's 42 Blue and 33 Green (or 42 Green and 33 Blue).

 

Here's one thread that explains pin 33, I'll see if I can find more...

https://www.performancetrucks.net/fo...ighlight=efans

 

After a little research, it seems that we're both right, pin 33 is for ac fan operation, which is also high fan operation

 

Ya, I got your mssg. True, pin 33 is for a/c (or high fan). So that would be Fan #2, right?

Ya, here's what happened. I started the job @ 11am. It was just me. My back/ neck has been bothering me since last Thur. So, I wanted my bro Matt to get that clutch fan nut off. He's ~5'11"/ 275# of bull; so he removed it so I didn't futher aggravate my neck. He left, then I took care of takin off water pump, removed T-stat (swapped a 160* in) draining everything in pans. And on frame & garage floor.
I cleaned water pump & block, T-stat surfaces w/. a fine disc on a 90* die grinder. I wiped spills & cleaned various things most wouldn't.

~4:30 Matt & my other brother came home w/ their White Castle's. I kept goin. Then Matt came out & started helpin w/. those pesky OEM clamps. :nunchuk1:

@ 6PM, waterpump repair was done & fans were buttoned up. I then started on wiring. Got (+) on junction bx. when ~6:30PM my buddy Joe (electrical help) arrived. Put on (-) to alt. brkt.

Now, the part of job I was worried bout. PINS! I had my bro yappin in my ear while my friend was doin the pins. Joe says PCM connector nearest engine (blue).
When I 1st heard of blue, I took it to mean WIRE not connector. So...blue connector is for pin 42 (a blue wire BTW). Nothin is there, pop it in. So then we move to pin 33 ( stayin w/. the connector. Joe says, hey, it has a purple wire in there. Now what?

At this point, we shoulda never saw a purple wire in pin 33. WHY? Cause it was from connector. Once u install pin 42 from PCM connector, done. You then remove PCM connector. for pin 33.

The incorrect pin 33 (from conn. is actually a purple wire that controls TCC brake switch/ cruise release signal. Joe found that from online & verifying where we went wrong. Believe or not, I was ask why don't we see if conn. pin 33 was empty. Oh well, solved. Learn by mistakes.

That's why I asked what purple did?

Pins done. I then tuned w/. tables from Whippled496 as ref. w/. my other bro walkin me thru HPT since I forgot flash process. At 10PM or just before, I was home & down after movin vehicles around. Really, I just stopped for Dinner, but watched how to do PINOUT. I don't wrench for a livin, took extra steps, worked thru problems - thought I did alright for the job.

 

I don't think so, here's how mine works (1 pin harness)

PCM commands fans: both fans low

AC compressor engaged, PCM not commanded: one fan high

PCM commands fans and AC compressor engaged: both fans high

Did you check out that link I posted? A lot of good info there?

How about the water pump gaskets, were they deformed?

What temps did you set your fans to?

 

Billy, Fan #1 or #2 info like u just posted, IDK. I wasn't sure, but I thought u meant Fan 2 was the high fan. I still have to learn more bout what fan does what. Tuning side too.

I'll read that link tomorrow; really tired. After finishin, I took my bro I live w/. for a ride. Heard some knock when I uhh took to my usual test area. Coolant level was still a bit low; hopefully that's why. I shoulda brought another gallon over to Matt's house. I'll top off on tomorrow (Thur.).

Top off coolant & retest --->

Fan temps were accord'g to Whippled496 chart. I'll tweak after checkin/ as needed. I wanna experiment w/. that a bit.
Anyway.

Fan #1 ON: 174* OFF: 169*
Fan #2 On: 180* Off:175

Fans turn on: 50 MPH off:55MPH

FAN #1 A/C press. enable:1516 disable:1034
Didn't have that for #2 on HPT (or I can't find).

Gaskets deformed? Terribly!!!

Pics on Thur. if I can, you'll see how bad tomorrow. Many pics. Read sig. I've got some surprises for my PT. net friends. Stay tuned!

 

Here's a few. Next post has the rest. To help those w/. slow connection.

Stock engine bay pic w/. clutch fan. Ya, before jokers post, yours is cleaner. Note coolant level. It was @ halfway mark cold only 1 1/2wks ago. It leaked down to 1/4 mark in that time. That's why I started this job in 1st place. Mysterious coolant leak near water pump, nothing comin from weephole.


Hose detail water pump & fill tank.

Stock ALT. junction block.

Stock clutch fan. BIG NUT!

Drivers(D) view. Uppeer coolant hose w/. pesky hose clamp. I don't feel like rotating 90*, yada yada. Rotate pic or yourself.

Stock rad. Passenger(P) view
This features 5 things top to bottom.
1)Coolant Recovery Hose (usu. has a braided lookin cover). Has my pinchoff pliers on it.
2)Trans cooler line
3)TB hose to prevent icing
4)Trans cooler line
5)Lower rad. hose. This is how mine is drained since it lacks a drain petcock. If u have a petcock, it's on (D) side @ bottom.

W/P & T-stat view

Torn down ready for new 34" rad. Note big rubber washer on core support, secures old rad., it'll be used to secure '05 Efans. New 34" rad. uses hole ~3" toward (D) fender.

 

And the CULPRIT!!! W/P gskt (P) side. Note deformation by following bolt head down to point where it intersects w/. yellow handle You can see the yellow handle between gap where gasket pulled away. [it's the intersect point of bolt head / tip of orange driver handle. Also, what is that skunky algae green on bolt? It was only on center bolts(both sides). I know some is rust, but is it a thread coating from GM?


This view is w/p (D) side. It's deformed worse than pass.(P) side. The round gskt. pulled away w/. lil trouble. Replaced T-stat w/. 160*.



Efans in, time for wiring!!!

Heater hoses & another pesky clamp on recovery bottle.

ALT. junction blk


Another shot of junction but wires attached. Relays near white ties (all I had left).

Junction & PINs done. LOOK @ all that ROOM!!!

PCM pins. Blue wire leads to PCM. Had to cut loom: it's a wee bit short. It'll get covered better later. Not seen is green wire. Zip ties to be replaced w/. black.



DONE!!! Time to tune. Notice too what's left of clutch fan. Just a big threaded nub on hub.