mcratchet1

Ok, I checked all the banjo bolts on fuel lines and found the ones on fuel pump loose. Idk if that has anything to do with it. If loose seems like they could suck air unless water changes this issue. But that’s above my paygrade. I’m new to these electronic emission trucks. Thanks!

Hello, I have a strange issue with my 2013 Mack mru with mp7 engine. I was pumping in the rain and truck try to kill four different times. Rained stop no problems came back to shop. Getting a pid94 fmi 7 code. Pulled truck up and degreased around fuel filter area. Try to start truck it crank and ran about 1 minute and stalled. Would not start up. I took my blower and dried the whole drivers side engine and then it started right up. So is there a sensor issue or wiring intruding water that would stop truck from starting. Just trying to get an idea where to start looking. Thanks

Ok thanks I’ll give them a shout

I have a 2013 mru 613 the small radiator that sets behind driver side is leaking on the seams. Does anyone know a good aftermarket one or a good place to buy salvage? For a new one Mack wants $5500.00 this blows my mind. It’s 18”x36”part #21199385 thanks!

I’m assuming this is probably an ecu issue ?

So I changed that green ac switch the fan is now working properly. But now if you turn ac on the fan stays engaged all day

No it’s not broke but yes seems to wobble when clutch is engaged. The problem I’m having is it stays engaged 75% of the time. As soon as I leave in the morning

Ok finally checked it out blowing air does dis engage clutch. I have air going into that air switch but no air coming out. I have power but no ground. When I add a ground everything works. Checked wire to harness I do not see any issues. Does anyone know where the ground comes from? Also does that air switch disengage with ground or power? I also added a video does it look like clutch has to much wobble? IMG_8323.mov No when I shut off key fan stop almost immediately. That’s with clutch disengage. Also when I unplugged ac line switch the clutch engaged. The truck is cold so it should not engage.

Ok finally checked it out blowing air does dis engage clutch. I have air going into that air switch but no air coming out. I have power but no ground. When I add a ground everything works. Checked wire to harness I do not see any issues. Does anyone know where the ground comes from? Also does that air switch disengage with ground or power? I also added a video does it look like clutch has to much wobble? IMG_8323.mov

Sorry it is an mr688s it’s off in the morning for just a few mins then stays engaged the rest of day until just idling at shop but temp never goes over 180 if I remember correctly it only engages when temp hits 200

I have an 07 mr688s with a Horton pneumatic fan clutch. Having issues with it constantly staying engaged. What’s the best way to diagnose if it’s a faulty sensor or bad clutch? Thanks in advance

Ok got it I’ll clean it up and pull top cover of transmission thanks

Just to clarify the cover we’re talking about removing is on the back side above yoke? Four bolts to remove, I tried to pull that one off but does not want to move back. Didn’t want to try to pry it off. Never removed that one before is it ok to tap it back with a rubber mallet?

Is this it under back cover the attached pic

Yes I flip the button before taking it out of high gear to go into low. I tried it in neutral as well no difference