What did you do with your GMT400 today...or yesterday....

[dbrannon79]

Never mind had to let it climb to 325 for the first cycle. Now it’s cycling at 280 and off at 218 psi. Wheu-wee. I was already thinking that the only sensor port in my compressor was for a low side!! Al is good Cab temp holding 47 degrees on high and it’s almost 90 outside

 

[Big T]

My son had sent me a photo of the trip meter from the ‘94 Suburban saying he had filled it up and done nearly 200 miles with not stalling. Then I saw his wife posting pics in Instagram and I immediately recognized the worn leather interior.



So I can declare that the ‘94 is (finally) running reliably.

 

[Big T]

And I declare the oil leak fixed on my ‘99:



Now all the leaks are addressed and I’m down to fixing 4 Low on the transfer case.

 

[MrMarty51]

Wonderful news. Whutta trip.

 

[dbrannon79]

Well I just ordered ANOTHER idler arm bracket! this'll be the third one going to get installed. replaced the last one under warranty for up down play. The one I have now is doing the same thing. ordered an AC Delco one, should arrive tomorrow sometime. crossing my fingers that this will be the charm!

I'm tempted to grind off the top plate on the bad one after I get the new one installed, pull the old one apart to see what's making them fail so quick.

 

[Husker6.5]

Probably made of Chinesium.

 

[dbrannon79]

Probably made of Chinesium.

Your probably right. Cheap auto parts topped with covid quality

 

[MrMarty51]

Not just chinesium but, commiechinesium.

 

[Husker6.5]

I looked at both of them sitting in my driveway as I got home from work last night in my Camry.

 

[DieselAmateur]

@dbrannon79 care to show a pic or two of how you got the electric fan clutch wired in to kick on with your a/c? I have all the components for the ev fan clutch and think I can gather how to wire the basic fan clutch and controller in. But despite all the talk of trinary switches in other threads I still have no idea how to make the a/c and fan clutch work together, I do much better with visual learning

 

[dbrannon79]

@dbrannon79 care to show a pic or two of how you got the electric fan clutch wired in to kick on with your a/c? I have all the components for the ev fan clutch and think I can gather how to wire the basic fan clutch and controller in. But despite all the talk of trinary switches in other threads I still have no idea how to make the a/c and fan clutch work together, I do much better with visual learning

I used the green wire from the Hayden controller to the purple pressure switch in back of the compressor. The other wire to the switch is hot spliced into the clutch wire. Only two wires connected to the clutch going to the controller. Here’s some pics. I’ll have to look up the diagram for the controller and draw something up on how it’s all connected but it’s fairly simple

the plug from the clutch is coming out between the split of the fan shroud on the passenger side and the controller I have zip tied up next to the passenger battery

 

[dbrannon79]

Got the new idler arm bracket installed today. While I was down there I noticed lots of play in the sector shaft in the steering box, I know it’s wore out so I just loosened the adjustment nut and turned the set screw in about a 1/2 turn. Drove around the block…. Man that made a world of difference taking a lot of play out of the steering wheel

 

[dbrannon79]

@DieselAmateur do you have the fan clutch and controller already wired up for it to work with engine temp? On the controller wiring it lists two wires for fans iirc. One is used for the fan clutch and the other is going to a light in the dash to tell me when it’s on. The green should be input positive from the ac clutch to manually turn on the fan clutch it’s just connected between the OE high pressure condenser fan switch so it’s not on all the time with the ac. Comes in at 280 psi and off at 218. So far it’s working like a charm

 

[DieselAmateur]

@dbrannon79 Thanks for sharing!

Would love to see a diagram, still a bit confused and forgive my ignorance...

so the (I presume high side?) pressure switch on the back of the compressor is wired solely to the fan clutch controller now and not connected to factory wiring at all? I see a dark green and lime green wire coming off the pressure switch. Is the dark green wire coming from the controller and the lime green spliced into +12v?

I haven't wired the controller or clutch in yet. I do plan on having a manual switch in the cab that will be illuminated when the clutch is engaged and also be a manual switch for me to turn on the clutch per-emptively for towing applications.

 

[dbrannon79]

On my truck before I owned it someone eliminated the pressure switch on the back of the compressor. All I did was install the purple high pressure fan switch that usually is present on the 454 gasser models and robbed a connector from the salvage yard for it. It doesn’t matter which pin is used for the controller vs 12v+. But I actually found the original wires that were supposed to be on that switch tucked away in the harness behind the intake!!

one pin from that switch goes to the controller and the other is receiving 12v+ when the ac it on. for yours, you can tee off the hot wire to the ac clutch and to the second pin in the switch so it won’t cut off the compressor at all but be able to send power into the controller signaling the fan to be on when pressure is high enough.

this setup might be an issue if you already have a factory pressure switch in that spot. From factory in my truck that switch was a high pressure cut off for the compressor to shutdown when pressures got too high! This was where Ak and others were suggesting a trinary switch mounted on the one schrader port on the front condenser.

I hope my explanation helps make better sense

 

[DieselAmateur]

Thank you @dbrannon79 for the info, I'll stop the thread hijack and if I'm still befuddled when I get around to the upgrade I'll reach out separately or start my own thread

 

[dbrannon79]

@DieselAmateur Here is a partial diagram I drew up on my pc using images online. I need to get the fan clutch pinout, maybe someone can help me with that. but I only used two pins for the controller, I think it was pin 1 and 2 for fan 1 and ground.

 

[MrMarty51]

@DieselAmateur Here is a partial diagram I drew up on my pc using images online. I need to get the fan clutch pinout, maybe someone can help me with that. but I only used two pins for the controller, I think it was pin 1 and 2 for fan 1 and ground.

View attachment 73799

Nice diagram. Simple to say the least. I’ll be saving that to the notes in My phoney so when the time comes it’ll be right handy.

 

[dbrannon79]

Nice diagram. Simple to say the least. I’ll be saving that to the notes in My phoney so when the time comes it’ll be right handy.

as soon as I get the pin out info on the ev clutch I can add to it showing which wires to use plus I think there is an rpm wire one can connect and see the percent of lockup the clutch is at too!

I know when mine locks in, it sounds like a tornado under the hood !

 

[ak diesel driver]

Pretty sure I put the pin out in my electric fan clutch thread