The problem when moisture and oxygen enters the sealed system, it breaks down the refrigerant into hydrochloric and hydrofluoric acids, which then in turn damage the mechanical components. You have a major problem, and I'll save you a house call charge by telling you that the entire sealed system has to be replaced. If you only have the system evacuated and dehydrated, then recharge the system, which even if its done properly and legally, by an EPA Certified Type I Technician, in other words, not recommended for a DIYer, due to the process required, would still be a major repair, and would not last as long as it should due to the acid damage.
This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
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Symptoms
You likely won't notice any drivability problems.
Causes
A code P0442 most likely means one or more of the following has happened:
With a P0442, the most common repair is to:
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Poked very small hole in coolant line gas leaked out can I fix it with Epoxy
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