# 2005 Mercury Grand Marquis LS Transmission

**URL:** <https://community.cartalk.com/t/2005-mercury-grand-marquis-ls-transmission/68995>\
**Category:** Maintenance/Repairs\
**Tags:** mercury, grandmarquis\
**Created:** [October 27, 2011, 3:34pm UTC](https://community.cartalk.com/t/2005-mercury-grand-marquis-ls-transmission/68995 "2011-10-27T15:34:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bobruppert](https://avatars.discourse-cdn.com/v4/letter/b/48db29/32.png) [@bobruppert](https://community.cartalk.com/u/bobruppert)\
**Post date:** [October 27, 2011, 3:34pm UTC](https://community.cartalk.com/t/2005-mercury-grand-marquis-ls-transmission/68995/1 "2011-10-27T15:34:34Z")

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On first start of the day (engine cold), the transmission emits a siren-like sound similar to a hydraulic pump air-bound or cavitating. Sound disappears after first 1 or 2 miles of driving. Does not repeat during the rest of day when engine is warm. Repeats again at first start each morning. Ford dealer check of no value since mechanic could hear nothing with engine warmed up.  
Any diagnosis suggestions out there? Thanks.

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**Author:** ![chaissos](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/chaissos/32/2347_2.png) [@chaissos](https://community.cartalk.com/u/chaissos)\
**Post date:** [October 27, 2011, 5:35pm UTC](https://community.cartalk.com/t/2005-mercury-grand-marquis-ls-transmission/68995/2 "2011-10-27T17:35:15Z")

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You could ask them if they can check it “first thing in the morning”, and leave it parked there overnight. If you have a second car (or can get a ride), go back to be there in the morning, when it’s cold.