- Joined
- May 1, 2014
- Messages
- 273
- Points
- 170
Hello guys,
I'm evaluating a used Multi (CNG), and I think I've spotted a problem.
I'm writing in this section because I think it's a general tech question.
When you see micro air bubbles (a lot of them) coming up from the bottom of the reservoir when you rev the engine, there is always something wrong somewhere, right? a blown head gasket, right?
The seller's mechanics stated that it is normal, but I don't think it's right:
How can be possible that gases found their way into the cooling system?
the air bubbles do NOT come out of the return hose (on the top of the reservoir), but they found their way through the bottom hose: so, they run against the flow of the water.
Another thing: when I was doing this test the cap was on. so the pressure has to be important because those bubble come up in a pressurized system. Or can be a bad cap that doesn't keep the system pressurized?
I'm evaluating a used Multi (CNG), and I think I've spotted a problem.
I'm writing in this section because I think it's a general tech question.
When you see micro air bubbles (a lot of them) coming up from the bottom of the reservoir when you rev the engine, there is always something wrong somewhere, right? a blown head gasket, right?
The seller's mechanics stated that it is normal, but I don't think it's right:
How can be possible that gases found their way into the cooling system?
the air bubbles do NOT come out of the return hose (on the top of the reservoir), but they found their way through the bottom hose: so, they run against the flow of the water.
Another thing: when I was doing this test the cap was on. so the pressure has to be important because those bubble come up in a pressurized system. Or can be a bad cap that doesn't keep the system pressurized?
