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Roy
Roy, import/domestic specialest
Category: Car
Satisfied Customers: 5863
Experience:  ASE master tech for 40 years
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2010 freightliner cascadia every 20 seconds purching the air

Customer Question

2010 freightliner cascadia every 20 seconds purching the air dryer realisis air i changed air governor air compressor and air dryer still same problem
Submitted: 1 year ago.
Category: Car
Expert:  John Vieira replied 1 year ago.

Releases all of the air?

Expert:  John Vieira replied 1 year ago.

Okay, I reread the issue you are having and have a better understanding of what you are saying. So every 20 seconds it releases air? We need to look for air leaks in the air system completely. Let's start there, get back to me, and we can go a different route if you have already done this. thanks. John

Customer: replied 1 year ago.
there is no air leaks in the truck we already checked
Customer: replied 1 year ago.
every 20 seconds purges air compressor stops after that and comes back on in 20 seconds basically comressor goes on and off
Expert:  John Vieira replied 1 year ago.

What model air dryer do you have?

Customer: replied 1 year ago.
wabco
Expert:  John Vieira replied 1 year ago.

Is there any moisture coming out of the exhaust port? or oil contaminates?

Customer: replied 1 year ago.
no its dry
Expert:  John Vieira replied 1 year ago.

How long does the purge last?

Expert:  John Vieira replied 1 year ago.

20 seconds? right?

Customer: replied 1 year ago.
Write your reply here...like regular purge five seconds
Expert:  John Vieira replied 1 year ago.

Where is the dryer getting the signal from is it a port on the govoner? Or off of the unload-er valve?

Customer: replied 1 year ago.
govenor
Expert:  John Vieira replied 1 year ago.

I am thinking that the air dryer would be less responsive to a signal from the un loader valve of the compressor, probably less than 5 seconds, or maybe you got a bum govenor

Expert:  John Vieira replied 1 year ago.

I would certainly try another governor.

Customer: replied 1 year ago.
we pur three governors already
Expert:  John Vieira replied 1 year ago.

3- that bites! Well I apologize but

That's all I got on this issue, I hope I was of some help to you, if not let me know now, so i can opt out and release this question back into the pool of experts. Thanks man and have a great night. Good Luck. Thanks, ***** *****

Customer: replied 1 year ago.
no help dont charge me please the
Customer: replied 1 year ago.
can we please ask the question again maybe another mechanic
Expert:  Roy replied 1 year ago.

good morning my name is ***** ***** I will assist

it sounds like the purge valve on the dryer. very common failure. you can get just the purge valve kit and change it yourself.

have you replaced this???

Roy

Expert:  Roy replied 1 year ago.

how are you making out??

Roy