1989 Mercury Grand Marquis - Answered Questions & Fixed issues

check this link might help you out. Car stopped on the road Just went dead No power at the ignition no power...

a simple test here may reveal the fault put the hand brake on and in neutral start the engine if it idles ok then put your foot on the brake if there are problems then have the brake booster replaced that is indicated because at lights , you have you foot on the brake when turning people use the foot on the brake to maintain control

a factory workshop manual will help you with the problems ac moving from cool to heat means that the ac compressor is cycling from the thermostast setting if you have climate control in use , that indicates a problem climate control module

If your car died suddenly while driving, it is one thing, if it just didn't start one day, it is another, but given you have not given enough information, start here. Always check fuse first, this will tell you if pump is shot in most cases. Then check fuel pump relay located left fender under hood in fuse box. There are three relays as I recall, and if fuse was good, then more than likely it is relay, if I recall, two of relays are same type, so swap positions to diagnosis, you should be able to hear the fuel pump running, so get a gift wrap paper tube and put it near fuel pump location on gas tank and you should hear it easily, so this will further narrow down problem if you can't hear it run. Good luck. FREE-PPV

Two things pop immediately to mind... but before even going there... be VERY CAREFUL 275 pounds seems terribly high for an '89... If something cuts loose at that pressure you best have all your helmets, flak jackets, gloves, glasses & cups on... (I'm just saying). Pressure line should be hot and suction line should be cool... coming back to the compressor.. Yes...?? Lets get to the two things on my mind: 1. Malfunctioning Heater-A/C baffles cause lotsa grief. 2. Drier: Desiccant saturation by exposure to atmospheric moistures... replace or attempt recovery by pulling & holding a SERIOUS vacuum before re-charging your system. ELSE: Ice crystals will form at the "ORIFACE" and PROFOUNDLY AFFECT PERFORMANCE... PLEASE Note. Pulling & holding a 29 vacuum also certifies your main compressor seal (ergo... refrigerant & lubricant will remain intact)... Any trace of OIL BUILD-UP on the front of the COMPRESSOR (or inside the hood in alignment with your compressor pulley) should be addressed... oil level checked & augmented (only as needed)). Hope this helps Seal http://www.rockauto.com/en/catalog/mercury,1989,grand+marquis,5.0l+302cid+v8,1199505,heat+&+air+conditioning,a/c+compressor+seal,6676 More Information for MOTORCRAFT YE57 Drier More Information for SPECTRA PREMIUM COOLING DEPOT 0233168

Someone will need to find out if it is fuel or spark to know which system to inspect.

O2 sensors been changed lately?

looks like excessive internal pressure in the engine; check your engine ventilation system and make sure any and all restictions are removed.

Wheel alignment and tire balance are the first place to look. if you feel vibrations in the seat. the rear wheels are the fist place to check. if vibrations are present through the steering wheel, then front tire alignment and tire balance are probably the cause. or something suspension or steering related. Even uneven wear on tires can cause this. but uneven wear is the sign of another problem, tracing back to suspension or steering problems.

Are you looking for a wiring diagram or a head light switch with a vacuum diaphragm to operate the light covers or to bring up your lights when you turn them on,like a corvette,if like a corvette,I had a 1971 corvette that didn't open and I used the vacuum parts on the light switch off of a 1968 Pontiac GTO,the light switch was the same as the corvette

Could be a vac leak, or something going on with the ac compressor. Or it could be normal.The computer will turn off the compressor when you push the gas pedal to the floor. Otherwise, the vac control valve circuit for the HVAC could have a leak and not be able to hold the valve open or closed when you open the throttle. The control valve is under the dash.

What type of pressure? Oil, Water, What?

sounds like you may have a vacume leak

Sounds like the the parking light fuse blew.Under the dash there is a fuse block.you will see fuses there and remove the fuse to see if blown.If so replace with same type fuse.Anymore questions will be glad to help you... I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

It is in the trunk, drivers side almost straight down from the trunk hindge.

Check the wiring in the steering column, something is almost disconnected. Indicating a short is near. Check the Ignition switch. Usually the problem - connections. You need a Lock smith that will check and verify. Please let me what you did.

could be fuel pump or could be a sensor is failing..may want to have a scan preformed.....good luck..

If you have a digital clock you will have three buttons below clock one will say date and one will say time. There will also be two small black buttons above the clock. Push and hold time button and use the two small black buttons to set time- left button goes down in time and right button goes up. You can do the same thing to set date as well.

dash and tail sre tied together, so chk tail light fuse.

Yes, it has steering fluid... What is the question?