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Fuse to the a.c. compressor keeps popping I've replaced the…

Customer Question
Fuse to the a.c...

Fuse to the a.c. compressor keeps popping I've replaced the hvac module with a brand new one

Mechanic's Assistant: Most vehicles have two fuse panels. Have you located both?

I don't know where the second one is

Mechanic's Assistant: What is the model/year of your Chevy?

2003 Chevy avalanche

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

Yea I've checked wiring from the low press switch to hvac module checked the relay and fuse to a.c. compressor coil replaced the compressor coil. As well it was working intermittently last Friday now it's not wanting to work at all

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

Is there a diode with in the wiring harness if there is where is it...

Submitted: 2 months ago.Category: Chevy
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Answered in 2 minutes by:
5/30/2018
Chevy Mechanic: K. Wiggins, ASE Certified Technician replied 2 months ago
K. Wiggins
K. Wiggins, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,630
Experience: ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade
Verified

Hello, is it manual or auto climate control?

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Customer reply replied 2 months ago
Auto
Customer reply replied 2 months ago
Auto climate control
Customer reply replied 2 months ago
I don't want to call
Customer reply replied 2 months ago
Are you going to answer my questions or noo
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago
kalamykid
kalamykid, Shop Owner/ Tech
Category: Chevy
Satisfied Customers: 5,593
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
Verified

What size engine is in you truck?

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Customer reply replied 2 months ago
It's the 5.3
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

And yu keep blowing the 10 amp compressor fuse correct?

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Customer reply replied 2 months ago
sir
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Do you have a digital volt meter and a test light so we can do some testing?

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Customer reply replied 2 months ago
Yea I have a digital volt meter right now
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Can you pull the ac relay out and locate pin 87 based on the diagram on the relay in the fuse box, unplug the compressor and find the dark green wire in the compressor plug and set your meter to ohms and see what the resistance is at each location to ground please?

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Customer reply replied 2 months ago
1 ohm
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

On each end of the wire to ground? Or from one end to the other?

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Customer reply replied 2 months ago
I need to check the black wire to ground then???
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Yes hold your black lead to a good ground, then test each point : the relay pin for pin 87, and the green wire at the compressor with the compressor unplugged.

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Customer reply replied 2 months ago
Black wire to battery ground (battery unplugged) .0 ohm
Green wire to relay pin 87 .1 ohm
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

You must have the battery connected to do this test.

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Customer reply replied 2 months ago
Battery was unplugged I just went to the ground wire to the battery
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

To get a good test result, you must reconnect the battery.

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Customer reply replied 2 months ago
I got .8 ohms
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

At both ends?

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Customer reply replied 2 months ago
On the black ground wire to known good ground .8 ohms
Green wire to relay pin 87 .1 ohms
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

That is not what I asked you to do. I asked you to hold your black test lead for your meter to a good ground, and use your red lead to test pin 87 for the relay in the fuse box with the relay removed then test the green wire at the compressor with the red lead and tell me what your reading is for each of the two tests. Keep the black test lead on a good ground for each of these tests.

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Customer reply replied 2 months ago
Known good ground to pin 87=33Mohm
Customer reply replied 2 months ago
Known good ground to green wire at compressor connector= OL
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Why did you replace the field coil for the compressor?

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Customer reply replied 2 months ago
It wasn't activating when I first got the truck so I replaced it and it started working intermittently I thought it was the hvac module and I replaced that today and all it does now is pop fuses on the a.c. clutch
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Are you 100% sure that you tested the pin in the fuse box that matches pin 87 on the relay?

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Customer reply replied 2 months ago
I retested and got OL
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

And when you tested the tow points together black test lead at pin 87, and red lead on the dark green wire at the ac plug, you got a reading of .1?

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Customer reply replied 2 months ago
Yess
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

With the compressor unplugged, relay back in the fuse box, and a new fuse in the ac compressor fuse, start the engine and turn the ac on and see if the fuse blows again please.

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

With the compressor unplugged, relay back in the fuse box, and a new fuse in the ac compressor fuse, start the engine and turn the ac on and see if the fuse blows again please.

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Customer reply replied 2 months ago
Popped again
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

And you left the compressor unplugged correct?

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Customer reply replied 2 months ago
No
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Put a new fuse in the ac fuse spot, unplug the compressor and start the engine and turn the ac on and see if the fuse blows again.

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Customer reply replied 2 months ago
It didn't pop
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

That was what I was hopping for. The wires and relay are still good, but your new field coil is shorted out and you will need to replace it again.

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Customer reply replied 2 months ago
Seriously
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Yes seriously.

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Customer reply replied 2 months ago
Whattttt the helllll
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Man made the part, and man makes mistakes.

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Customer reply replied 2 months ago
I just checked the coil it's still reading .o ohms
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

That tells me that the coil is bad for sure. If you go from pin to pin on the coil, you should get a reading of 0.00 or less.

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Customer reply replied 2 months ago
What ohm spec is it supposed to be??? Now I do have a question I had someone come help me last Friday they dropped my original 10 amp fuse and pit a 15 amp in its place and that was popped when I saw it today could to many amps cause it to have shorted the brand new coil
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

No. If it popped a 15 amp fuse then there is a direct short in the field coil. The 15 amp fuse can handle more power then a 10 amp can. The 10 amp fuse would pop even faster then the 15. Trust me the field coil is BAD.

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Customer reply replied 2 months ago
I have another coil that reads 3.9 ohms would that work
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Test each pin against the metal framing of the coil and see if any of them do not show OL. If they both show OL then yes you can use it.

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Customer reply replied 2 months ago
I'm getting 300+kohm on the black and the same on the green lead
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Then it should be ok.

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Customer reply replied 2 months ago
Thank god!!!
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Just to make sure, can you plug the other field coil up, start the engine and turn the ac on and see if the fuse blows? If it does not, hold a screw driver about 1 inch away from the top of the coil and see if it pulls the screw driver down to it?

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

Make sure to keep the coil away form the fan and anything that moves just in case it magnetizes and grabs what it can.

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Customer reply replied 2 months ago
Ok thankd
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 2 months ago

You are very welcome.

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