On our last trip I had trouble with the coach building air pressure. Had it on high idle and it still did not build full air pressure. I turned off the engine and went out to listen for leaks- nothing. Tried again and she finally built up pressure, everything seemed to work, so we drove on to Yuma, AZ. Concerned about this I started reading about it in a great knowledge filled area- this forum.
My conclusion is that the D2 could be going bad and since I like to start with simple solutions, I went out today and got one from NAPA $19 like has been said on the forum before.
A friend of mine who has an old MCI ( got your attention Dave M.??) said he would come over and help me change it out as he has experience in doing it. I got things ready for him to come over and decided to try to break lose the nuts on the D2. Wow, they were not tight, I didn't have to use any force to loosen them. I stopped at this point and when Dan came over we talked about it. He thought the same thing I did- if the D2 was not tight, that could be where the air leak is. We tightened it up, I fired it up and air built up right away. Problem solved.
Lesson learned- if having issues with air pressure, check for tightness of D2 before replacing.
I am keeping the D2 I bought for a spare just in case.
Glad you figured that out. I like to start with the simple, obvious stuff first. Sometimes I have no idea what that is though. Thanks for the good tip.
Can I ask a dumb question?
What is D2
It is the engine-mounted governor regulator. It controls the air supply to the coach air systems.
Bob,
on ours it is located on the frame to the curb side of the engine block, to the rear and above the transmission cooler.
I am going to purchase one from NAPA and keep it in the coach, for $20 its good insurance. Easy to replace.
More info on D2 here:
Haldex D2 Governor Service Data (http://beamalarm.com/Documents/haldex_d2_governor_service_data.html)