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I had a service call yesterday. Â The air valve for the neck jets on my Envoy was making a loud air intake noise. Â The valve body is split according to the service guy. Â He also found that the air jet valve for the adjacent corner seat was not working properly. Â Two new valves are on order.Questions: Â Could I have done something to cause these valves to fail? Â If so, what? Â Are these valves subject to failure? Â The dealer says that they don't stock these valves because they rarely if ever have needed them. Â Is this credible?Thanks,Bill
 He also found that the air jet valve for the adjacent corner seat was not working properly.  Two new valves are on order.