Air Governor Going Bad Maybe?

When was the last time you changed the air dryer cartridge? I change mine every year never had a problem.

 

Cold temps can make small unnoticeable leaks turn into problems. It may be that you have several leaks that are biting you in the butt during cold weather. However, air govenors are not too expensive. Swap it out. If it doesn't fix the issue, then you have the spare you should be carrying anyway.

 

Did you replace the air governor also. Some truck have the air governor inside the air dryer, it all one piece. Some have air governor is separate from air dryer. The air governor go bad and are easy to replace and cheap.

 

Where is it leaking from? Bottom of the dryer? It's probably either a bad governor or a bad purge valve on the dryer. I had a similar problem this year. I rebuilt the dryer and that didn't solve the problem. I replaced the governor and that did solve it. There is a message line between the governor and the dryer that tells the dryer when to pure. If the valve in the governor that sends pressure to the message line gets stuck the purge valve will hang open - until the governor warms up and the valve closes.

 

I replaced my air dryer/ governor assembly last summer, a Bendix unit mounted on the end of tge air tank. Reman (Mexico) from Freightliner. Never has worked properly. Froze up this winter, first time for this truck in 16 winters.
Replaced it with a new unit. Found my discharge line compressor to tank had a hole in it causing extended recharge times. Only leaks when compressor is pumping, hard to detect.

 

Yes, the governor might also need replacing. Does it fail to build pressure because the air compressor cuts off too early? If so then it's definitely the governor. If not, then the compressor will still be running while the pressure hangs at 60, and air has to be leaking somewhere. You need to find out where.

You are sure there is no air blowing out of the bottom of the dryer?