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Old 08-05-2018, 12:58 PM   #1
Join Date: Jan 2014
Posts: 38
Dash Warning Light 2001 Diplomat

The warning light on the dash comes on when I start the engine and goes off about 3-4 minutes later. The manual says warning light says check "fluid" levels.The recovery tank is about 2/3 between min and max when cold.Do I need more antifreeze/water mix or could it be a faulty sensor?
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Old 08-05-2018, 02:27 PM   #2
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Join Date: Oct 2016
Posts: 1,380
Hi Jwessling; Well, it could be both. The fact that the warning light goes off is a good sign to me. It show that no codes in the engine ECM are keeping the light on. Do you have the original Monaco plastic expansion tank with the probe down into the tank? If so the first thing I would try is to add some coolant. As a start, that is the easiest thing to do. If you get the same results, I would next move to the low coolant sensor. Is yours the large alum. probe with one wire hooked to it, or is a small 1/8" probe that is in the tank. The large alum. can get a coating over them and need to be cleaned so they work properly. That system usually will make the low coolant light come on, not the warning light. If yours is the 1/8" probe, you might want to, if possible, clean it. I would also check the electrical connections to the probe. The coolant tank on my 01 Windsor was replaced with the newer nylon tank with the Ford low coolant sensor in the lower bottom of the tank.
Also this is off the subject of the coolant tank. When leaving Az. this winter, after the coach sat for 2.5 months, I got the warning light but it did not go off. I have a Silver Leaf Monitor and on the diagnostic section it showed, low voltage to the ambient air pressure sensor. Coach drove fine all the way back to Wa. state. In the morning when first traveling, the warning light did not come on for over 1/2 hour and then would light for the rest of the day. All I am suggesting is that the warning light can mean many things with no specifics to why it is on. To me, it is still a good sign that the warning light does not stay on. I replaced the ambient air pressure sensor when I got home and the waring light is now off. Keep all us informed with what you have found and what he fixes are. Hope it turns out to be something simple. Good lucl!
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Old 08-05-2018, 03:03 PM   #3
Join Date: Jan 2014
Posts: 38
Thanks, I did replace the recovery tank with another plastic one and had problems with leaks around the two connections on the top but they were re-sealed. I will check your recommendations tomorrow.
Thanks again
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Old 08-06-2018, 03:58 PM   #4
Join Date: Jan 2014
Posts: 38
Success!! I added another 3/4 gallon of fluid to the recovery tank and the light did not come on.

By the way, I called Monaco support and there are now two options, press 1 for warranty parts, press 2 for warranty tech support. I guess when the warranty is up, there is no support from the REV group.
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dash, light

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