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1995 Suburban K2500 with 7.4L engine here. There is a loose…

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1995 Suburban K2500 with...

1995 Suburban K2500 with 7.4L engine here. There is a loose wire, dark green with a white stripe, running next to auxillary fan switch wire (light green). Right now it's not connected to anythimg, just hanging loose near the aux fan switch on the passenger side. Where is it supposed to be connected?

Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about?

I'm not talking about any light. I'm asking about a loose wire in the engine bay.

Mechanic's Assistant: Are you fixing your Suburban yourself? What have you tried so far?

I am fixing it myself. Haven't tried anything because I don't know where to connect the wire to.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

If he can show me a picture of the area in the engine bay that would be great.

Submitted: 1 month ago.Category: Chevy
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Answered in 7 hours by:
1/4/2018
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago
Mike S.
Mike S., Chevy Mechanic
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Satisfied Customers: 7,836
Experience: ASE Certified Master Technician
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Hi, I am Mike, welcome. I'm reviewing your question.

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

You never said which auxiliary fan switch you were referring to because there are 2, an auxiliary cooling fan temperature switch which is located right cylinder head above staretr and an auxiliary cooling fan a/c pressure switch switch which has the dark green/white wire and is located rear of the compressor.

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Customer reply replied 1 month ago
I was referring to the one on the passenger side.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

The one located right cylinder head above starter?

Well, that is the auxiliary cooling fan temperature switch and that does have a light green wire. That dark green/white wire probably hooks to the diode.

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Customer reply replied 1 month ago
I know there might be a diode there, but where does it go from the diode? Is there a drawing that shows that part of the engine bay?
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

You already have the drawing. It is the one I was looking at.

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

Follow that light green wire from the auxiliary cooling fan temperature switch or the relay to that diode.

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

This is the first time you said that wire was actually broken. Anyhow, follow that light green wire until you find the diode, There is also another diode, follow the dark green wire from the heater and a/c control module to find it. I looked but could not find any location info on either diode.

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Customer reply replied 1 month ago
The locations of the two diode is really what I need. Will head to the junk yard to see if I can find something similar. I looked all over the internet for a picture or drawing of that part of the engine bay but couldn't find one.
Customer reply replied 1 month ago
I guess the 7.4L is rare and not all trims from those years have an aux fan. This picture is somewhat helpful... I'm guessing it's from a factory service manual? Hayes has no drawings like this..
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

That as from alldata.

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

Did you find it yet?

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Customer reply replied 1 month ago
No everything in the junk yard is the 5.7 vortec, either no aux fan switch or somewhere else
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

Why are you looking in salvage yards and for what?

I meant did you find where them diodes are located?

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Customer reply replied 1 month ago
that and where the wire goes after that. I really don't want to cut open the harness open right now.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

The 5.7 has them same diodes.

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Customer reply replied 1 month ago
Do you know where the harness and connector for the fan control/AC amd heater control is? The whole dark green wire runs between the cooling fan AC pressure switch and the fan control harness. Since the cooling fan AC switch side has no broken wires, I figure the fan control harness must be where the broken wire is supposed to go.
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 month ago

No I don'.t

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