AC On Apu Kicks On, Bogs Down And Kills Apu

Topic 14855 | Page 1

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Geoff M.'s Comment
member avatar

Has anyone experienced this? Just had the air compressor on my apu replaced, because it was not blowing cold air, now I have cold air (yay!) EXCEPT that now when my ac kicks on it bogs down and shuts my apu down. It gives a low oil pressure reading on the panel, but oil level is perfect. (I am told this reading is generic for what could be other things). Had the air filter replaced, no change. Was told to drive for a few hours and charge up the battery, did this but no change. Ran the apu without the ac, no change. Any advice is greatly appreciated! Last options I am aware of are oil pressure sensor change or new apu battery?

OWI:

Operating While Intoxicated

APU:

Auxiliary Power Unit

On tractor trailers, and APU is a small diesel engine that powers a heat and air conditioning unit while charging the truck's main batteries at the same time. This allows the driver to remain comfortable in the cab and have access to electric power without running the main truck engine.

Having an APU helps save money in fuel costs and saves wear and tear on the main engine, though they tend to be expensive to install and maintain. Therefore only a very small percentage of the trucks on the road today come equipped with an APU.

Kevin H.'s Comment
member avatar

I don't know anything about apus , but I'm going to answer anyway :). I know in a car you get an oil light when it stalls, just because it's still sensing oil pressure and, well, there is none when it's not running. So if it's similar for an apu , it might not mean anything, If I had to guess I'd say that there's still a problem with the a/c, so that the compressor is too hard to turn and the engine can't handle it. But you said "no change" when running without the a/c? Or did you mean it still stalls after you ran for a while without the a/c, then tried it again?

APU:

Auxiliary Power Unit

On tractor trailers, and APU is a small diesel engine that powers a heat and air conditioning unit while charging the truck's main batteries at the same time. This allows the driver to remain comfortable in the cab and have access to electric power without running the main truck engine.

Having an APU helps save money in fuel costs and saves wear and tear on the main engine, though they tend to be expensive to install and maintain. Therefore only a very small percentage of the trucks on the road today come equipped with an APU.

APUs:

Auxiliary Power Unit

On tractor trailers, and APU is a small diesel engine that powers a heat and air conditioning unit while charging the truck's main batteries at the same time. This allows the driver to remain comfortable in the cab and have access to electric power without running the main truck engine.

Having an APU helps save money in fuel costs and saves wear and tear on the main engine, though they tend to be expensive to install and maintain. Therefore only a very small percentage of the trucks on the road today come equipped with an APU.

Geoff M.'s Comment
member avatar

Hey Kurt, thanks for the reply. First let me apologize, I thought I was hitting the reply Button and accidentally reported your response, so site guys if you're reading this, please disregard the report. Ok on to your reply... What I meant was I tried to run the apu (to charge up the on board ac converter) but it made no difference, still shut down when the apu a/c kicked in. I agree, because it'seems bogging down, it seems like something in the new account compressor is "too tight"? LOL I am not a mechanic but obviously it is somehow robbing power from the apu itself, when coming on. I am taking it back in to the Prime shop in the coming days to get fixed, it'seems getting too hot now, to not have my ac. And I can't idle the truck because of the idle cutoff. (That is going away too, as I lease that truck) Thanks for your reply!

APU:

Auxiliary Power Unit

On tractor trailers, and APU is a small diesel engine that powers a heat and air conditioning unit while charging the truck's main batteries at the same time. This allows the driver to remain comfortable in the cab and have access to electric power without running the main truck engine.

Having an APU helps save money in fuel costs and saves wear and tear on the main engine, though they tend to be expensive to install and maintain. Therefore only a very small percentage of the trucks on the road today come equipped with an APU.

Geoff M.'s Comment
member avatar

Ugh spell correct on the phone is terrible.... NOT account compressor, air compressor

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