# 1998 Mercury Grand Marquis - HVAC advice

**URL:** <https://community.cartalk.com/t/1998-mercury-grand-marquis-hvac-advice/173420>\
**Category:** Maintenance/Repairs\
**Tags:** mercury\
**Created:** [December 18, 2020, 7:30pm UTC](https://community.cartalk.com/t/1998-mercury-grand-marquis-hvac-advice/173420 "2020-12-18T19:30:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![KRWeems](https://avatars.discourse-cdn.com/v4/letter/k/a3d4f5/32.png) [@KRWeems](https://community.cartalk.com/u/KRWeems)\
**Post date:** [December 18, 2020, 7:30pm UTC](https://community.cartalk.com/t/1998-mercury-grand-marquis-hvac-advice/173420/1 "2020-12-18T19:30:47Z")

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Heater & Defroster doesn’t work. What do I need to do to repair it?

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**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [December 18, 2020, 10:12pm UTC](https://community.cartalk.com/t/1998-mercury-grand-marquis-hvac-advice/173420/2 "2020-12-18T22:12:36Z")

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What do you mean by “doesn’t work”? Does the blower work? No warm air? We need more information to give a proper answer.

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**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\
**Post date:** [December 19, 2020, 6:54pm UTC](https://community.cartalk.com/t/1998-mercury-grand-marquis-hvac-advice/173420/3 "2020-12-19T18:54:16Z")

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Besides answering dave’s questions, do you have a full set of tools, including a multi meter? If not you would be best served taking it to a good, independent mechanic.

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [December 19, 2020, 7:55pm UTC](https://community.cartalk.com/t/1998-mercury-grand-marquis-hvac-advice/173420/4 "2020-12-19T19:55:46Z")

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Let’s get some more details, please

Blower motor works on all speeds . . . yes or no

Air volume is strong or weak

Air comes out where it’s supposed to . . . yes or no

Toasty air when you’ve selected hot temperature . . . yes or no

Once you’ve answered some or all of these questions, we can eliminate possibilities and start narrowing down the list of possible culprits