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When you say discharge line, you mean the output hose of the compressor to the dryer?

There are too many variables to give anyone an accurate estimate on mileage. It depends on the driver, the size of the box, the weight of the load, etc.

Howdy. We see a number of Aussies on this site. The problem is that different models and designs of Hinos are different and I don't have any way to look up anything for your truck, and I don't know what kind of fuel system it has on it. Is it setting codes when it loses power?

The engine is Hino, now a subsidiary of Toyota. They've made millions of them, in use around the world. The engines are fairly robust. Parts availability is good, but expensive. The worst part about them (like most modern trucks) is the after treatment is complicated, expensive, and not well...

If the engine is trying to stall, the brake is closing too far. Sometimes people tamper with them in an attempt to be more effective, but it doesn't work like that. Sometimes these trucks go into "white smoke prevention mode" if they've been left to idle for a long time. The brake immediately...

It's the cast iron thing bolted to the intake manifold.

The CEL could be a million different things. I'm pretty sure you need a fan clutch.

Sounds like an Australian truck. I have an A09 manual on my computer at home, maybe it has some insight.

All of this is covered under an extended warranty. Go to a dealer.

Some trucks are spec'd differently. If you have tons of electrical accessories, like a sleeper with bunk batteries, you may want a higher output alternator. All the ones you listed should work.

Codes pulled from the TCM will be pretty useful.

Do you ever hear the fan clutch engage? The fan will roar. Fan clutch failure is somewhat common. While you're in there, make sure the radiator fins aren't clogged. They can get caked with dust.

His ABS light came on, which unlocked the torque converter. The solution is to locate and snip one wire.

There's a separate air horn circuit.

The cover comes off with two torx screws under the steering wheel. Loosen them completely and jiggle the cover a lot. I've seen a number of older trucks have the horn ring contact wear away enough to stop making contact.

If it's got black smoke coming out of the tailpipe, the DPF is toast. The injectors deteriorate, over fuel, and the excess fuel causes DPF meltdown. There's more to it than that, but visible black smoke is pretty damning

There is a hydraulic fluid reservoir at the left rear of the engine bay for the booster pump. The reservoir stains and is impossible to see the actual fluid level through the gauge on the reservoir. This reservoir gets Dexron III atf. It'll alarm if the level gets low. Pumping the brake pedal...

There is not a dedicated trailer wiring circuit. You'll have to make your own.

Does oil still spew from the dipstick with the oil cap off? Sounds like a crankcase ventilation problem. VNT problems won't cause this.

Most of the time when the cruise doesn't work, it's from some underlying problem, like the brake switch is stuck on, the exhaust brake is left on, or there's an ABS light. Other times it doesn't work because spilled drinks have the buttons stuck, or maybe the switch isn't even plugged in.