Originally Posted by cowlitzcoach
Idling your bus, even at fast idle, for 20 minutes is a recipe for engine failure.
With no load the engine will never really get warm. When the engine does not get up to operating temperatures you don't get full fuel burn on each cycle of the piston. The unburned fuel tends to wash past the rings and will start to dilute your lube oil. It will also tend to coke up your exhaust system reducing your turbo efficiency.
If you want to run the bus then every month or so take it out on the road and give it a work out. Ten miles would be the minimum if the route included a good hill where the engine would get a workout or several miles at highway speed. For that matter, take it camping and use it as a tin tent if you can. But don't just run it in place!
If the blowers blow and then just shut off that tells me you have a relay that needs to be replaced. So that the full load of the appliance doesn't go through the switch relays are used to carry the full load of the appliance. Over time they get lazy and will shut themselves off. If you waited ten more minutes they would probably start right back up again.
Find a good hot lead that is full of juice and put it directly to the fan wiring. If the blowers keep blowing longer than they do now you will know you have a bad relay somewhere between the blowers and the switch. If the blowers cut out then you will know you have a bad set of blower fans.
I did not realize this. Thank you for the heads up. I don't have it registered right now, and even though I have it out in the middle of nowhere I really don't want to go drive it around unregistered and uninsured. I've been trying to start it up and let it run every few months for 30 minutes or so just to make sure it gets a little use.
Originally Posted by c_hasbeen
you should have a wiring schematic on the inside of your access door, you may study it for a little bit and figure out wire colors and circuit numbers that will help chase down a relay.
now that I think about it the schematic will not show the wiring diagram for any thing other than the heater fans inside the cabin, the separate webasto wiring schematic will not be on that access door cover.
Thanks, I'll check it out.
Originally Posted by family wagon
Is the time-to-shutdown consistent from one test cycle to another? Can the blowers be re-started immediately? Myself and cowlitzcoach are understanding your question to mean the blowers on those water-to-air heaters are shutting down; if something else is meant please say so..
I didn't keep trying it too many times, but it seemed that it ran for 5 minutes, then shut down, and would restart every time I flipped the switch, but then die within 30 seconds. And yes, it's the blowers on the rear heater (not Webasto) and the blowers in the front (drivers heat).