Onan 7500 quiet diesel

Well now gentelmen yes I sure did see the fault codes flased 3 times at first then a continued flash of one. The flash of one on the panel reads overheat. I think I read where someone said after begining flashes if you pushed the stop button agian it would give a more detailed code. this did not work for me. I really don't think I have a major issue and through a process of elimination i will reslove the problem. I want to change the thermostat as I do not know the last time it was changed. I have replaced the fuel filter, oil and air filter
even though some may not have needed replacement. I now know where I stand with service maintenance with this newly aquired coach. Basically this post was to find a block bleeder outlet to remove air from the coolent system. I don't think there is one and it may not be nessasary to do so. I thank everyone for their comments. Oh the reason I felt it could "really" be the sensor failure is that I have read that this has been a common problem with these generators. This condition will be eliminated through the process.

Agree with scott. If a QD quits, it will flash a code.
Since our modern world has saddled us with these computers, may as well use the info they give us.

Also, just saying... (as someone who has fixed things for a living his entire life...) If you changed the coolant on a perfectly good working genny, and aren't sure you got enough coolant into it, and now believe it's overheating...

I "really' doubt the problem is the sudden unrelated failure of a sensor...

iamalienru wrote:
I saw the u tube viedo. i did everthing they said the only thing i haven't tried is wait days for the to escape. I do work for living so getting back to will occur within a day or two. checking for viedo's and online is the first thing i do. At first i did fill through the overflow tank but corrected that and filled through the fill cap under the panel. Now i am still having the same problem. time may be the answer to this. If the engine had a bleed port on the block I figured this would allow the air to escape quickly..I will update this weekend as to my progress. could only be temp sensor or thermostat sticking

Well Sir,

It will help if you say if you've got any codes displayed on your start switch. No need for guessing if one is displayed.
scott

I saw the u tube viedo. i did everthing they said the only thing i haven't tried is wait days for the to escape. I do work for living so getting back to will occur within a day or two. checking for viedo's and online is the first thing i do. At first i did fill through the overflow tank but corrected that and filled through the fill cap under the panel. Now i am still having the same problem. time may be the answer to this. If the engine had a bleed port on the block I figured this would allow the air to escape quickly..I will update this weekend as to my progress. could only be temp sensor or thermostat sticking

RLS7201 wrote:

iamalienru wrote:
I did get the capacity from the panel. I did not get 4.5 quarts from the drain. This could because the overflow tank was clogged and not sending extar fluid to the radiator. It has been cleaned and there is now flow. I bought this coach in Jan. of this year. It seems there may have been some neglect on maintenance. I left the cap open overnight hoping it would burp out any air bubbles but it didn't seem to do much. I will probably take a lazer temp of the engine before changing out the high temp sensor or thermostat the water pump and belt seem to be in good shape. I was hoping someone was very familar with this engine and could let me know the best way to remove air pockets

I tried to tell you how to fill the engine with coolant by providing the Youtube video.
You didn't fill the engine in the proper place. Find the radiator cap under the cover and fill it there.

Richard

Second this. I've changed ours a couple times. You need to fill at the cap, not the reservoir.

Good luck. Let us know how it goes.

iamalienru wrote:
I did get the capacity from the panel. I did not get 4.5 quarts from the drain. This could because the overflow tank was clogged and not sending extar fluid to the radiator. It has been cleaned and there is now flow. I bought this coach in Jan. of this year. It seems there may have been some neglect on maintenance. I left the cap open overnight hoping it would burp out any air bubbles but it didn't seem to do much. I will probably take a lazer temp of the engine before changing out the high temp sensor or thermostat the water pump and belt seem to be in good shape. I was hoping someone was very familar with this engine and could let me know the best way to remove air pockets

I tried to tell you how to fill the engine with coolant by providing the Youtube video.
You didn't fill the engine in the proper place. Find the radiator cap under the cover and fill it there.

Richard

iamalienru,
I was just wondering, I don't know if you know anything about the "Codes" that, that gen can throw out if, and when it has operational issues. If you're not familiar with them, the codes show up as a sequence of blinking of the LED light, in the on/off/start switch of the gen itself.

When your generator shuts off on its own, is that switch "blinking" in any form of sequence? That is, something like three flashes, a short pause and then three flashes more, then a long pause, and the sequence starts again?
Scott

Do yourself a favor and go to that link provided above for the how to video on youtube. Follow these instructions and I bet your problems are solved

I did get the capacity from the panel. I did not get 4.5 quarts from the drain. This could because the overflow tank was clogged and not sending extar fluid to the radiator. It has been cleaned and there is now flow. I bought this coach in Jan. of this year. It seems there may have been some neglect on maintenance. I left the cap open overnight hoping it would burp out any air bubbles but it didn't seem to do much. I will probably take a lazer temp of the engine before changing out the high temp sensor or thermostat the water pump and belt seem to be in good shape. I was hoping someone was very familar with this engine and could let me know the best way to remove air pockets

This Link should help you correct the problem.

Richard