Air system

[dwarfracer1]

Anybody have any issues with the air warning buzzer in a d/p? I have a 2008 Tropical, 340 HP Cummins, just driving along sometimes the air warning will go off, the pressure in gauges will drop to zero then go back up! 1st time it scared s#$t out of me, stopped checked it out, nothing broke? sometimes 1 gauge will drop then start back up then other will drop? may go on for miles may not happen for hours?? any ideas?

[Skip426]

Pre, 2003 Freightliner chassis , had a similar issue.
Does National use there own chassis , or build on Freightliner or Spartan?

[dwarfracer1]

Skip, it's a Freightliner chassis. '08

[Skip426]

On the early, Freightliner chassis, the problem was poor soldered connections, internal in the VDC ( Vehicle Data Center) a collection device that broadcast info to the dashboard gauges , and there are posts , here in the forums about a DIY repair of those connections. The data system was changed in 03 to MCCI? and I don't know if the problem carried over to the newer chassis.
Because , Freightliner supplied the air system and the gauge/ warning system , the problem is a chassis issue, not related to National's coach build.
Could be time for a phone call to Freightliners free help line , have your serial number handy.
I have the number written down in 5 places at home , and I'm not there at the moment. I'll post as soon as I find it, and I'll do a search in the Freightliner forums, to see if other members have reported your problem with the new system


EDIT. Phone number is 1-800-385-4357 correct acronym for the new system is MMDC. If I come across anything helpful , I'll re-post.