Country Coach Owners Forum

In a message dated 3/7/2003 3:35:31 PM Pacific Standard Time, > rmccracken@b... writes:

> 2. Dust storm. Again Cummins
>
>

Hi Robin, thanks for your comments to other owners, another

always valuable.

On the subject of dust storm I would like to add my two

not a Cummins expert or motor mechanic but this is my observation

the dust storm problem.

FIRST, when I raised the issue with CC at the July rally last year

over a service tech who diagnosed the cause, replaced the part,

the controller and it has worked ever since. The tech (wish I had

was efficient,

took great care not soil the bedroom (we had to lift the engine

had a nice personality. It took about sixty minutes and we were

campers. Zero cost.

SECOND. In our case the basic problem was caused by the

being totally destroyed. This condition was obvious once the unit

removed from the block for inspection.

When the sensor is no longer functioning the system goes

safe condition which means the engine computer calls for maximum

keep the engine cool regardless of the actual engine temperature.
Consequently you will get dust storms the moment you start the

when cold.

It is my understanding that the controller is programmed to

the fans at different speeds dependent on engine temperature

the controller is not working correctly this could also create a

condition.
> One other possibility is a failure in the wires leading from

sensor to the controller causing an open condition.

Now the question of who is responsible. This immediately

question "was the dust storm condition there on delivery (new

it appear some time later. Frankly I doubt anyone knows when it

but for talking purposes let's assume it occurred some time after

and a few hundred miles on the engine.

What can cause the sensor to fail? Rather than guess, I

comments from Cummins experts.

Is the sensor installed by Cummins? If so do Cummins run

engines to operating speeds and check sensors before shipping to

alternatively does Cummins merely provide a port on the engine

other coach makers can install their own sensor later.

In the case of the controller responsibility seems to lay

although once the warranty is over I'm not sure they are on the

the problem is caused by a program error it should be an easy fix

tech but may be a bigger problem for a non CC service center.
> In my opinion based on experience the dust storm problem can

quickly and even if a charge were involved it should not be a high

Checking to see whether or not the sensor is severely damaged may

possible without removing it from the block.

Is there a Cummins ISC expert out there who can validate my

>

My problem was fixed and has stayed that way for the last

thousand miles.

How long will it remain that way, who knows? But to be

run a check every so often by starting the engine (from cold) and

walking around to the rear of the coach and standing in front of

radiator. If it is working there is almost no air movement until

is hot.
> Remember, if you have just run full speed on the freeway and > immediately pull into a dusty lot, there will be a storm as the

still running at maximum speed and will do so until the engine

you travel a few miles on secondary roads before arriving at the

engine may have cooled sufficiently to allow for reduced fan