I had the radiator replaced a few weeks ago. There was a boiling sound with the old radiator also. I just learned that it is not normal and have been trying to figure out the source of the issue. There is no mechanic available in this area. I have driven the bus many thousands of miles and it has not broken down, nor has the engine temperature gauge ever gone above 220. The only time I felt concerned about overheating was when taking the bus up extremely steep and windy dirt roads. I've stopped doing that, at least until I get this issue figured out.
The engine is a Cummins 5.9. I idled the bus for about 60 seconds and turned it off. Soon after that, bubbles began appearing in the expansion tank. I opened the engine cover and felt all the tubes coming from the back of the radiator. I feel bubble-y movement in the thin tube marked in red.
Any ideas what this might mean?
Someone recommended trying to replace the thermostat, which I think is under the tube marked in blue. Can anyone verify that, and if it might be worthwhile? I can probably get that part tomorrow.
The engine is a Cummins 5.9. I idled the bus for about 60 seconds and turned it off. Soon after that, bubbles began appearing in the expansion tank. I opened the engine cover and felt all the tubes coming from the back of the radiator. I feel bubble-y movement in the thin tube marked in red.
Any ideas what this might mean?
Someone recommended trying to replace the thermostat, which I think is under the tube marked in blue. Can anyone verify that, and if it might be worthwhile? I can probably get that part tomorrow.