[Andy]

The starting point is to read the codes. Coaches of your vintage likely have Pro-Driver and you can go to “faults” and see what is happening.

There are three causes for a Stop Engine Light. Low oil pressure, high coolant temp, or low coolant level with the last being most common. Check the level and if it is OK suspect the sensor as the problem.

[Chad]

Thanks Jon. The coolant was halfway up the window when cold. What is a typical oil pressure reading at low idle?

I’m hoping Jeff can read the codes when I’m there next week.

---

1984 96" with 8V92TA

(remodeled Liberty Coach)

Greenwood, MO

[Michael]

Andy,

I own the same year model Country Coach you have in a 40′ model. Your problems sound like a bad sensor in your radiator fluid tank or just the fluctuation of the fluid in the tank when it gets hot and cold is tripping the sensor.

I will get the engine warning light when my fluid hits the bottom of the sight glass. The radiator fluid tank empties as the engine runs and gets hot. The tank will then fill back up when the engine cools, so there can be a fluctuation of the height of the fluid in the tank while you drive. You can have enough in the tank to keep the sensor happy when the fluid is cold and not quite enough to cover the sensor when the engine heats up. I keep my tank filled to the middle of the sight glass and it keeps my sensor happy. Experiment some with yours, but do not completely fill the tank. Top of the sight glass is absolute maximum.

You should have the CC computer voice that monitors your systems and talks to you at start up and when things are empty, full, or go wrong. I have heard the little lady “engine shut down in 30 seconds message” twice in 250,000 miles. Both times, there was a leak in one of the lower hoses and I had lost most of the radiator fluid.

I have had the engine warning light and the low anti-freeze warning, or the add anti-freeze light as I like to call it, come on several times as well. Have Jeff look at it, you’re probably ok.

Michael

[Archived]

If I remember correctly the low oil pressure shut down point is around 3 PSI. You should verify that. But Michael seems to agree that the low coolant level sensor might be the problem.

I disagree wit Michael’s interpretation of what happens in the expansion tank. Your level of coolant at the sight glass is correct. As the engine heats the coolant expands and the level in the tank increases. If the coolant level is too high that expansion of coolant causes it to be purged from the pressure cap which is why when the engine is cool the empty space above the sight glass is where the expanded coolant goes. When the coolant level is low however the sensor will shut down the engine.

[Dick]

Thanks guys. I’ll probably just replace the sensor anyway since it is probably the original. The “shut engine down” has only come on twice and each time it was only for less than 5 seconds but it has only happened when in heavy traffic and idling. The lady was silent during both episodes including the transitional yellow warning. I do no think it is due to low coolant though. I’ll see what Jeff says.

[Bernard]

Not sure about the coolant level sensor system on the later models like yours (haven’t had any trouble with my current coach) but my previous coach gave me issues and the system had a module in addition to the sensor in tank. My module was bad.

[Gerald]

Joelselman,

I believe that my coach is probably built like your current coach but I’ll have to check on the module so I at least know if there is another mode of failure.

[Dick]

Andy, my 2000 chassis is also very sensitive. If coolant is seen at the bottom of the site glass, I can get a light. I try to maintain the coolant level showing 1/2 to 3/4 of the site glass.

[Deleted User]

Thanks George. I just pulled in to ETLC so hopefully I’ll find out what the codes say and I’ll report back.