Mercury

Mercury repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

I am working on a 2005 Grand Marquis with an intermittent…

Hi, I am working on...
Hi, I am working on a 2005 Grand Marquis with an intermittent rough idle. Check engine light is off. There are no stored codes. I replaced vacuum line between throttle body and purge solenoid? This seemed to help. The engine ran smoother. I was also trying to get the climate control to shift between floor, vent and defrost. This has been an intermittent problem for the past year. It seems to work better when the weather is warm. In the dead of winter I have no floor heat. I think all these issues are related to poor vacuum. Should I replace vacuum hoses between throttle body and tee that branches off to Brake booster?? Where do I start?
Show More
Show Less
Ask Your Own Mercury Question
Answered in 10 minutes by:
8/21/2017
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Mercury
Satisfied Customers: 2,312
Experience: Automotive Instructor at Palm Beach State College
Verified

Hi, My name is Jay

The Tee where it connects to brake booster, PCV and throttle body will get a small hole in it where it connect to the throttle body. Check it there for a bad vacuum line. It comes as an assembly from store or dealer. On the a/c you need to check the small vacuum lines where they go into the firewall for the a/c and trace back to vacuum canister and to the engine and repair any cracked lines.

Ask Your Own Mercury Question
Customer reply replied 11 months ago
To get to the T do I need to remove the cowl at the edge of the windshield? Do I need to remove the windshield wipers to get the cowl off?

No you do not. Follow the hose from the brake booster and where it connects to the intake back side.

Ask Your Own Mercury Question

The vacuum tee is the part that goes bad. I would not recommend cutting it out until you know if it leaking and you have the replacement. It will show small holes and will leak vacuum if it is bad. It will be soft and mushy if it is bad.

Ask Your Own Mercury Question
Customer reply replied 11 months ago
Can I plug the port at the throttle body to see if it changes how the engine idles? I realize this would disable the power brakes and climate control?
Customer reply replied 11 months ago
I have a hand vacuum pump. If I plug the hand pump into the vacuum line that goes to the T should it hold vacuum if I pump it up??

You can plug it to test idle and see if it helps but will not have power brakes. Also the other side goes to the PCV valve and this can cause rough running if blocked. You can apply vacuum to the brake booster but it will take a large amount of vacuum to pull a vacuum on the brake booster. You will need to disconnect and block booster vacuum line.

Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Mercury
Satisfied Customers: 2,312
Experience: Automotive Instructor at Palm Beach State College
Verified
Jaybird61 and 87 other Mercury Specialists are ready to help you
Ask your own question now
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mercury mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Jaybird61 Your Own Question
Jaybird61
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Mercury
Satisfied Customers: 2,312
2,312 Satisfied Customers
Experience: Automotive Instructor at Palm Beach State College

Jaybird61 is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

< Previous | Next >

Meet the Experts:

Chris (aka- Moose)

Chris (aka- Moose)

Mercury Technician

2,029 satisfied customers

16 years experience with Mercury

John Mc

John Mc

Mercury Technician

403 satisfied customers

19 years Ford Lincoln Mercury experience

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

332 satisfied customers

Have owned a repair shop for 25 yrs.

Ron Z.

Ron Z.

- Mercury Tech -

291 satisfied customers

18+yrs experience. State Inspector and Mercury Diagnostics

Chuck

Chuck

ASE Certified Technician

287 satisfied customers

33 Years experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

scottz136

scottz136

Mercury Technician

260 satisfied customers

senior master lincoln mercury tech.

Don - Mo Lurch

Don - Mo Lurch

Mecury Mechanic

258 satisfied customers

Ford Cert., Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years

< Previous | Next >

Related Mercury Questions
Ac keeps going from the dash vents to defrost when I speed
Ac keeps going from the dash vents to defrost when I speed up....it switches back and forth alot … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Second opinion] Ac keeps going from the dash vents to
Second opinion] Ac keeps going from the dash vents to defrost when I speed up....it switches back and forth alot … read more
A. Penland
A. Penland
Ford Senior Master Technician
Vocational, Technical or Trade School
6,957 satisfied customers
My 2002 Grand Marquis a/c is cold but only blows air through
my 2002 Grand Marquis a/c is cold but only blows air through defroster vents, not blowing air through the dash vents> What's wrong?… read more
Eric
Eric
Auto Technician
589 satisfied customers
Mercury Grand Marquis LS: 01 grand marquis when choosing floor
01 grand marquis when choosing floor or defrost, the panel continues to blow, there is an intermittant clicking and eatc self test shows 888 with all symbols lit… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
How big a job is it to replace the climate control board? I
How big a job is it to replace the climate control board? I am getting heat flowing from the defroster vents, no where else. ANd the buttons for floor, vent etc do not work? This is a 2006 Mercury Gra… read more
Ron
Ron
Automotive Tech
Vocational, Technical or Trade Scho
36,868 satisfied customers
Mercury Grand Marquis LS: I have a 2011 Mercury Grand Marquis
I have a 2011 Mercury Grand Marquis has no heat at defrost vent and no floor heat but good heat from dash vents ,got any ideas?… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Mercury Grand Marquis: 2002 grand marquis - heat and air work
2002 grand marquis - heat and air work fine for a while. Then after some amount of time, the air quits coming out of either the defroster, vents, or heater vents. The Fan still turns and I can adjust … read more
Eric
Eric
Auto Technician
589 satisfied customers
2006 Mercury Grand Marquis LS: that ac blows..instrument panel
I have 2006 Mercury Grand Marquis LS that AC blows out floor and defrost vents and not front instrument panel vents… read more
Ron
Ron
Automotive Tech
Vocational, Technical or Trade Scho
36,868 satisfied customers
2009 grand marquis: erratic..hwy speeds it blows cold..work fine (most
2009 grand marquis erratic a/c vent issues at hwy speeds it blows cold from the dash vents for a time then defrost only then floor and defrost yet it seems that at city speeds say 40 or less it seems … read more
Ironmike
Ironmike
ASE Master L1 performance ,Ford tech
Vocational, Technical or Trade Scho
1,773 satisfied customers
2001 Grand Marquis: clutch engages..Climate control..No leaks
2001 Grand Marquis. New Compressor... clutch engages/disengages when A/C or A/C Max are press on Climate control panel... No leaks... High/Low Pressure good... lines accumulator ice cold. Climate cont… read more
6Bucs
6Bucs
Senior Master Tech
Associate Degree
3 satisfied customers
2003 Mercury grand marquis: blows..vents..climate control..cold air
I have a 2003 Mercury grand marquis with electronically controlled a/c. The a/c blows out the defroster and floor and will not blow out the vents. Also when I change the climate control temp for heat,… read more
DBAutomotive
DBAutomotive
Owner/Operator
Associate Degree
113 satisfied customers
Grand marquis: ac..blows..air comes from defrost vent..restart
03 grand marquis ac blows then air comes from defrost vent then goes to floor vents then back to ac vents also car has quit turn off then restart has did this twice… read more
Tim
Tim
Associate Degree
3,579 satisfied customers
Mercury Grand Marquis 2004 mercury grand marquis, air conditioner
2004 mercury grand marquis, air conditioner blows only thru the defrost vent and sometimes thru the floor vent, but never thru the main vents. I took the climate control apart. I do have a vacuum on t… read more
TIM MOHR
TIM MOHR
SHOP OWNER
Master's Degree
8,037 satisfied customers
2005 Grand Marquis: defroster..vents..moderate acceleration..vacuum
On my 2005 Grand Marquis, the air conditioning and heat only blows through the defroster vents. If I select floor or vent, the air is still directed to the defroster vents. I even tried selecting floo… read more
Richard
Richard
Vocational, Technical or Trade Scho
13 satisfied customers
blows..vents and defroster..have an electronic climate control
A/C alternately blows from vents and defroster, I do not have an electronic climate control… read more
Chuck
Chuck
ASE Certified Technician
Vocational, Technical or Trade Scho
287 satisfied customers
I have a 2006 Grand Marquis LS w/auto climate control. Air
I have a 2006 Grand Marquis LS w/auto climate control. Air will NOT blow out of the floor vent at all. When the control is set on VENT, all is OK except when I accelerate or when the engine is under l… read more
Ron
Ron
Automotive Tech
Vocational, Technical or Trade Scho
36,868 satisfied customers
2003 Grand Marquis. Need detailed schematic and pictorial
2003 Grand Marquis. Need detailed schematic and pictorial of A/C system components. Looking for source of intermittent operation of cooling and air ducting. Cooling turns on and off unpredictably, and… read more
scottz136
scottz136
Mercury Technician
Vocational, Technical or Trade Scho
260 satisfied customers
My 2006 Mercury Grand Marquis has auto climate control but
My 2006 Mercury Grand Marquis has auto climate control but is stuck on defrost/floor even if I try to override in manually it will not change.… read more
Michael
Michael
Automotive Technician
High School or GED
257 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x