do bunk heaters blow cold air as well?

if they did they would call them bunk coolers

 

They will in January when you are in North Dakota and they are not working

 

Just curious...... can you chock the wheels and release the brakes and idle?
My truck will idle if I set the high idle. If left on the low idle it dies in 5 minutes. But if the brakes are released it won't stall...

 

or maybe pull red button and push yellow button .... ?

 

I would not do it... it's not safe. What if for some reason the chocks move away and the truck starts rolling without you noticing? If that's not something the co. has done to the truck, have it repaired.

 

To the op ... it takes more energy to get a/c, you need to drive a compressor ... which is why you need some kind of apu, either one with a big battery bank that will likely still die in 10 hours, or the small diesel engine apu mounted to your frame, or you could create your own solution with a gasoline generator/portable ac unit vented to a window ... there are a few threads about various ways this is accomplished ... But if you are a company driver, just find a way to let it idle, it really doesn't cost all that much extra as long as you are only idling as absolutely necessary ...

 

Is it a button or a knob?

 

The truck doesn't have opti idle?

 

I had a wabasto or an Espar that you could either use the heat or just turn the fan on and circulate the air around.