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I have a 2006 peterbilt 335. The air conditioning is not

Customer Question
I have a 2006 peterbilt...
I have a 2006 peterbilt 335. The air conditioning is not working however the prssures are good. It is obviously an electrical issue as there is no 12 volt signal being sent to the compressor. I would like to try obtain a wiring diagram so I can figure out how the 12 volt signal flows.
Submitted: 2 years ago.Category: Medium and Heavy Trucks
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Answered in 12 hours by:
8/5/2015
Technician: Andy, Truck Diagnostic Technician replied 2 years ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,720
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
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Hi my name is ***** ***** I would like to try and help if I can. I need the full vin number please?

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Customer reply replied 2 years ago

2NPLLZOX46M653179

Customer reply replied 2 years ago

2NPLLZOX46M653179 PB335

Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Thanks for the info!

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Here is your diagram ! I enlarged it for easier viewing but in doing so , I had to split it into 2 halves . you just need to print it and put them together like a puzzle. Please do not forget to rate my service to you . Feedback is important and bonus is appreciated . Thank you !

https://www.dropbox.com/s/dkkmgajwmyyavaz/air1.png?dl=0

https://www.dropbox.com/s/hd9ue82404c8phg/air2.png?dl=0

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Customer reply replied 2 years ago

OK Thanks I will let you know how it goes. For some reason I am only getting 4.2 volts at the compressor

Customer reply replied 2 years ago

OK Thanks I will let you know how it goes. For some reason I am only getting 4.2 volts at the compressor. I see a 15 amp fuse by the drivers left foot. Do you know where fuse box 4 is located? (25 amp fuse)

Technician: Andy, Truck Diagnostic Technician replied 2 years ago

No . Unfortunately I don't ! Perhaps it's the ground side of the circuit that is dirty and needs to be cleaned up at the clutch connector( or wherever it gets its ground from . )

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Customer reply replied 2 years ago

When I ground the voltmeter and pin the positive side of the connector its 4.2 volts so i'm not even using the connectors ground so it has to be something else. The wiring diagram color codes on the link you sent me seem to be different than our truck so not sure if it will work. I will check next time i'm around the truck-also there is no bunk on our truck (I'm not sure if that makes a difference)

Technician: Andy, Truck Diagnostic Technician replied 2 years ago

Power comes from the relay according to the diagram . Have you tried swapping relays with another circuit to see iif the relay may have bad contacts inside ?

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Customer reply replied 2 years ago

I will try that today. I have to find the relay. The inside cover of my fuse panel makes no mention of a ac relay so I'll look for one. This fuse box 4 has me a bit confused as I can't find another one other than the one by the drivers left foot and if there is one maybe the ac relay is in there.

Technician: Andy, Truck Diagnostic Technician replied 2 years ago
I would imagine there to be only two panel . One inside and one outside .
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Customer reply replied 2 years ago

Can you see if there is another wiring diagram option? I looked today and it's significantly different-different colors,wires routed differently, no bunk etc

Technician: Andy, Truck Diagnostic Technician replied 2 years ago
I tried using your vin number but for some reason , the system wouldn't take it so I had to enter the info manually . I did not see any other diagrams in ther other than the sleeper hvac .
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Customer reply replied 2 years ago
Ok thx. I may have to take it to the shopthen as it's almost possible to track the wires down when the colors don't match the diagram
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

I will have another look and see ! Can you tell me if it is a bergstrom system or a Behr system ? Are there any markings ?

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Customer reply replied 2 years ago
On the compressor?
Technician: Andy, Truck Diagnostic Technician replied 2 years ago

No on the hvac system anywhere on the firewall !

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Technician: Andy, Truck Diagnostic Technician replied 2 years ago

And you also mentionned that this is a daycab correct ? No sleeper at all ?

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Customer reply replied 2 years ago

K I will look next time it's in-probably mid week. No cab

Technician: Andy, Truck Diagnostic Technician replied 2 years ago

you mean no sleeper ?

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Customer reply replied 2 years ago

Sorry yes. No sleeper

Technician: Andy, Truck Diagnostic Technician replied 2 years ago

I had a bunch of other diagrams with different length of sleepers but only one day cab and that's what I sent

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Andy
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 1,720
1,720 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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