I don't have a truck but a motorhome with a Cummins 5.9, 275HP, 3060 Allison. When I am on the road my 'low water' light comes on. All fluids are at correct levels. In addition when climbing steep hills my temp guage goes from the &quot;R' in &quot;NORMAL&quot; to the &quot;A&quot; in &quot;NORMAL&quot; and then the &quot;ENG PROT&quot; light comes on. When I reach the top and level out the temp goes back to it's regular position and the &quot;ENG PROT&quot; light goes out. The &quot;low water' light goes on whenever it feels like it. Doesn't have to be climbing and temp is OK. <br>I can't find info on what the &quot;ENG PROT&quot; light signifies. <br>I feel the &quot;low water&quot; light might be a faulty sensor. Where is this sensor located? <br>Any other ideas?<br>Thanks<br>D I C K ( I spaced my name out because the forum censored it when I did it normally )

 

Might have an air lock in the system. If it's a front engine . Park on a incline and check the fluid level. The air might come out. If it's a rear engine might try backing up the incline???<br>This trick works on some cars with long rad hoses. [undecided] [undecided]

 

That Eng Prot light might be telling you to let out of the throtle because the exhaust temp is high. I don't know this for sure but you might want to find out. Do you have an exhaust temp gauge? What about a cat in the exhaust, if so throw it as far as you can. Or at least I would, cause it could be plugged up.

 

Thanks for the replies. I am going to try and call Freightliner tomorrow and see what they say. (MH is on a Freightliner chassis). <br>I have been considering an exhaust temp guage but have been procrastinating. May be time to stop and do something. <br>Never had a diesel before and I'm trying to learn.<br>D I C K<br>Http://ackerman.irvamerica.com (site down temporarily)