Apu is overheating

OK, this is an admittedly half arse guess, but is there an intake air filter that could be plugged?

 

There is a recall on the temp sensor of comfort pros.

http://www.impcotechnologies.com/pdf/bulletins/TSB-538_A.PDF

 

Here's the main publication site, gives you alot of information on troubleshooting and stuff as well.

http://www.impcotechnologies.com/apu-pub-truck.asp

 

Check your 15A fuse. Proper coolant purge. ALT/Water pump belt proper tension. Then go with seeing if the radiator fan is working. Kicks on at 170. 15 amp/ bad fan switch, or faulty fan. proper function of the thermostat. If still mystery and everything is working change over heat temp sensor. Still on curring issue it needs a head replacement.
Comfort pro specialist at your service.

 

Hi, the link you posted is shut down...

 

Hey, how did you end up fixing the problem ? My unit shuts down too just like yours. Took it to Philadelphia Carrier dealer 3 times. Paid 3 times with no success. I had another Carrier dealer in Texas say the problem was an oil temp sensor, Philly said no it wasn't and didn't replace the sensor even when I asked them to... Looking for a resolution.... G

 

Overheating issues. Is your fan kicking on? No, check the 15 amp fuse. Fuse is fine? Might be your fan switch (sensor behind the unit down on the backside of the radiator.)

Fan is running could be a bad overheat sensor that kills the unit randomly. This sensor has been known to be replaced because it has a I wanna say a 5lb torque limit, and tends to be over torqued causing the probe inside to break.

If you have a reservoir on the back of your truck for your unit, length of hoses can be a factor, also they're is a burping/ purge procedure that is fairly easy to do when topping off your coolant reservoir. Also when doing this procedure I usually tighten the alternator/ water pump belt. I I should of listed this procedure first cause this is my first steps when dealing with over heat issues.

Could possibly be a stuck thermostat.

Your unit should be serviced every thousand hours. Cleaned/ washed from road grime. Air filter changed.

Sorry how unorganized this post was. Did it on my phone.

 

Dang saw that I answered that almost a year ago. Anyways sorry you're having to deal with people who just take guesses and yet you still have to pay that labor rate.