Sorry if my questions seem a little odd - this actually relates to a dispute between a customer and a dealer, and what I'm trying to do is get an independent opinion without biasing you one way or the other. The engine issue itself has since been resolved - I'm trying to establish what kind of tests would be needed to detect the problem
The first overheating and radiator replacement occurred a couple of years (and a few thousand miles) prior to the customer buying the vehicle. The dealer did not inform the customer of this prior to purchase.
The tests the dealer did after the 2nd overheating & radiator rupture were these:
- Pressure test (exact details not known, but conclusion was no leaks present)
- "Sniffer test" (again, no detailed report is available, but they concluded no oil in water, no water in oil, no exhaust gasses in water)
They concluded from this that the problem was an air-lock in the system, and said the van was performing as normal.
A short time after this there was another overheating incident, and a different garage confirmed the head gasket had failed, with a "bubble test". They stripped the engine and found the actual failure was caused by the cylinder head leaking through No3 exhaust port, which ultimately caused long-term damage to the head and gasket .
The crucial question is, could the original leak have gone undetected by those two tests the dealer carried out? They are claiming that all the damage occurred after they returned the van to the customer, and their argument is that the negative tests prove this, although it should be noted there's no documentary proof of the tests themselves.
I'd like to know if you agree with their position, or if you feel they could have gone further in diagnosing the problem
I'd also like your opinion as to whether this sounds like a sudden, short term problem, or something that would have built up gradually over time.