why did the temp gauge quit working?

5

Asked by May 04, 2013 at 12:35 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

the temp gauge didn't register upon initial start up.  After running it to operating temp the gauge doesn't register anything.  I've replaced the sensor in the manifold with negative results.  Where/what else can it be?  The vehicle has 216,000 miles if that matters.

9 Answers

96,985

The temperature sensor in the manifold provides the varying ground potential to the gauge. The gauge gets power from the instrument cluster. It either is not getting power or the gauge is bad. -- You can check the temperature sensor with a meter. See how many ohms to ground you read as the engine warms up.

4 out of 4 people think this is helpful.

Check your battery to make sure it's newer than seven years old. Clean the other end of the the negative cable as it's bolted onto the chassis/frame...this is important that it has solid ground at this point...also to the motor~

11 out of 11 people think this is helpful.
27,235

Yes as tenspeed you need to check the circuit with a meter. Your guage problably took a dump

3 out of 3 people think this is helpful.
27,235

I dunno why. parts go bad eventually. Since he said he replaced the sending unit its either a wire issue or the guage so checking the circuit with a meter will tell you which one it is.

3 out of 3 people think this is helpful.
27,235

Bcm has nothing to do with it.

2 out of 2 people think this is helpful.

the sensor is right in the middle of the engine~

4 out of 4 people think this is helpful.
27,235

he/she has replaced the sensor already so the diagram of where it is located doesn't seem necessary. your second diagram is incorrect the sensor is located on top in the intake crossover tube. as shown in the first correct but unneeded diagram.

3 out of 3 people think this is helpful.

...of course was there all along, the reason we aren't finding a bad fuse is because the chassis ground is weak...every start creates a slight "blue weld" from the 300 or so cold cranking amps...after a few hundred starts the corrosion between the two dis-similar metals creates a insulation zone of burned lug and frame....so grab a coarse wirebrush and wire brush the frame and lug...restoring ground to the chassis and to the fuel gauge~ final word....judge

2 out of 2 people think this is helpful.
60

my daughter has one of these cars. the check engine light came on a few months ago. the said it was the IAC valve so we replaced it. Now the light is back on and it says it is either the IAC valve or the temp censor what do you think? The gauge even after driving for 30 min barely registers. It has always read right in the middle.

6 out of 6 people think this is helpful.

Your Answer

Add photo

Related Questions

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,808 nationwide Grand Marquis listings starting at $2,250.

ZIP:

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 5,450
#2 kbro
kbro
Reputation 2,060
#3 Js08016
Js08016
Reputation 1,740
View All

Related Models For Sale

Used Ford Crown Victoria
10 Great Deals out of 1,066 listings starting at $2,995
Used Lincoln Town Car
35 Great Deals out of 1,834 listings starting at $1,750
Used Chevrolet Impala
577 Great Deals out of 31,558 listings starting at $799
Used Ford Mustang
461 Great Deals out of 45,641 listings starting at $1,999
Used Ford Taurus
234 Great Deals out of 20,408 listings starting at $2,258
Used Ford F-150
2,174 Great Deals out of 206,277 listings starting at $1,499
Used Cadillac DeVille
6 Great Deals out of 1,648 listings starting at $1,999
Used Chevrolet Tahoe
562 Great Deals out of 28,965 listings starting at $1,699
Used Chevrolet Camaro
219 Great Deals out of 30,798 listings starting at $1,217
Used Lincoln Continental
4,475 listings starting at $40,000
Used Buick LeSabre
13 Great Deals out of 1,935 listings starting at $995

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
34 listings starting at $4,995
2010 Mercury Grand Marquis For Sale
4 Great Deals out of 90 listings starting at $2,799
2009 Mercury Grand Marquis For Sale
8 Great Deals out of 96 listings starting at $3,790
2008 Mercury Grand Marquis For Sale
11 Great Deals out of 144 listings starting at $2,250
2007 Mercury Grand Marquis For Sale
4 Great Deals out of 143 listings starting at $2,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.