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~2011 CTS-V Coupe & 2013 SRX~
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Discussion Starter #1 (Edited)
I drove my "V" for about 20-minutes, then i let it sit for about 30-minutes. When i loosened the differential fill plug, all i could hear was hissing from built up pressure. I have not seen this before, so i need to know if this is normal behavior or not with these new vent setups. :bigroll:
 

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Just an XLR/V-series specialist GM technician at this point
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Unfortunately, it's normal, and for two reasons. One, the factory vent for the CTS/-V differential isn't big enough. Two, there's a spring and a valve in the vent that will only let pressure out if it overcomes spring pressure.

IMHO, it's a design flaw, and most likely the cause of pinion and axle seal leaks. There's a bulletin out right now that has us removing the vent cap/valve, and installing a hose and new valve onto the old vent. We've only recently starting putting them on, so no long-term tests to determine if this fixes the condition.
 
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