20 Most Recent 1998 Mercury Grand Marquis - Page 2 Questions & Answers

crank sensor needs tested and replaced

Check cruise control cable under hood is tight enough to pull throttle arm. Check brake pedal . see if wires to cruise control are still attached to switch on brake pedal. Check magnets are still on drive shaft if rear wheel drive. Check hall effect transducer is still in place to dedect magnets spinning on drive shaft. Check Vacuum tubing is ok on cruise control it pulls the cable in and out . Check if ignition sensing that wire is connected that senses ignition pulses ( front wheel Drive) Check if a speed sender device is used on speedo cable to create pulse (front wheel drive ) sometimes used to sense speed on some cruise controls. Check wiring around plugs and sockets under bonnet.

bad voltage regulator

shouldbe in glovebox

This is usually straight forward but I understand there is a bolt on the drivers side rear kind of hidden between the Firewall and engine. Also if you have an antifreeze leak on the front passengers side it is a common defect. At one time there was a Warranty for this defect.

The drive cycle is a 15 mile jaunt that reaches full operating temperature for the engine and exceeds 50 mph for about 5 minutes i was told

all cars have an alternator unless its totally electric car

sounds like a fuse box issue or multiple issues , does the ac compressor even clak when activated , i asssume the fan does not work. has these worked recently an just failed or has the car been in a flood maybe.

Make sure it is connected.

Hi Carnell,here's a link to your cts. Where is the coolant temp sensor located on 1998 mercury grand marquis LS...

It might be located in the glove box.

It Should be on the back of the fuse box, which I believe on that model is behind a panel, to the left of the steering column. I think you have to unbolt the fuse box to remove it from the back of the fuse box. I would disconnect the battery cable before working on it as I think the Air Bags are one of the things controlled by the GEM.

Often when you unplug the connector under the seat, the seat activator can be disabled...and doing that sometimes means the car will no longer start. With most airbag problems, it is better to go to the dealer or mechanic to have them disable the airbag. The buzzer can sometimes be unplugged (follow the sound under the dash), and it can also means the car wont start for you.

these have a relay which may be defective...also the switch has a sensor on it to detect dark driving conditions, and maybe malfuntioning

Are you talking about front--back, both? Did you check voltage and ground at the bulb socket?

You can bypass the inertia switch or replace it. Bypassing the switch is NOT recommended since it is a safety switch to cut the fuel pump off in case of a rollover type accident.

Best Answer!

You just have to figure out how to remove everything necessary from the front of the dash, so you can actually get at the gauges. It's just the trim piece first, plastic clips or screws. Now remember,if you were trying to remove the dash cluster, it would come out just the same way. You just need to get to it, not remove it. t should be pretty easy to figure out. Phillips head and/or 1/4 inch head sockets for screws and small bolts. Some are 5/16ths.

I will need to know what it is you are working on.But usually in the top of the bezel (clear part in front of guages) there are 2 screws either Phillips or torques head.Then below steering wheel there is a wide panel and generally there are screws that will need be extracted.These are a bit hidden so remove the panel and look for those.