The turbo emmits a very high pitched whine which should be barely audible over the exhaust and intake noise. The noise you describe is more like a leak in the air hoses from the turbo to the throttle body. The heat in Provance is nothing compared to the USA, and we have the same plastic parts. Check all of the fitting points, especially near the firewall where a couple of vacuum hoses are attached to the turbo intake.
Ditto on the suggestion that you have the trouble codes read. It could pinpoint the problem area.
Klaus
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(V♂LV♂s 1995 854T, 1998 V70R)
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