1998 Cadillac Eldorado - Answered Questions & Fixed issues

If the code P1258 comes forth on your 1998 Cadillac Eldorado, there may be three reasons: 1. Engine Coolant Temperature harness is open or shorted 2. Engine Coolant Temperature circuit has a poor electrical connection 3. Faulty Engine Coolant Temperature Inspect all relevant connectors and he wire harness, it there are any damages, corroded, broken, or out of place components, repair if possible, otherwise replace them.

On this website you find fuse box diagram and description for Cadillac Eldorado (1998) https://www.carknowledge.info/cadillac-eldoroado-1998-fuse-box-diagram

My opinion it is that it is, in fact, the driver's door switch panel and you should try replacing it (try EBay). The problem could ether be worn out switches, or there is a problem with the distribution of power to all the switches in the panel. You should be able to easily diagnose the problem by pulling the switch panel (without removing the door panel) and checking switched power at each switch at the back with a multimeter. Seat heating pads are built to flex but are a bit flimsy. As they get older and have been sat on many times, the element wiring can break in the weakest spot causing the problem. Unfortunately, to check out the wiring, you usually have to remove the seat.

first off i dont advise using this type product, but i know it isnt always convenient to buy a 2 r 3 hundred dollar radiator, but anyway, with the car cool remove the radiator cap and let the car run about 4 or 5 minutes and pour it directly in the radiator and replace the cap, you will then need to drive the car an additional 15 or 20 minutes for it to take effect, i would replace the radiator asap, asit could cause it to overheat and cost tons of time and money,GOOD LUCK!

Probably the shift release solenoid or the switch or relay that activates it. This solenoid usually activates when you press the brake pedal, releasing the shifter. There is usually an emergency release button that can be accessed to release the shifter in the event this occurs. Check you users manual for the location of the release and how to activate it.

Is your alternator actually charging? If you are not getting power into your alternator it will not put power out.

Usually, if it cranks good, but, won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. Knowing if you have multiple issues can help? If multiple issues, I want to check for rpm signal. If no spark only, check primary voltage and ground at the coil, go from there. Check for applicable trouble codes, to check codes, yourself, you may need an obd2 code reader. I can only make suggestions about what to check, you have to do the testing.

Some times when a number of things go wrong like described, a common ground wire is not making a good connection. If you can get a wiring diagram for this car, I would check to see if there is a common ground wire for the items in question. Also I would check the multi wire connectors at the computer. Resetting these plugs sometimes can help.

There is one cam sensor in the rear head on the passenger side, as far as I know there is only one. Maybe the confusion is that there are 2 crankshaft position sensors, and they are located near the oil filter adapter

Your best bet is to obtain a Chilton's or shop manual for your vehicle and read the remove and re-install instructions thoroughly before beginning any such effort. For example, the same repair you are suggesting on a jeep Cherokee is $600 labor to remove the dashboard to get to the $40 part....... Once you fully understand the steps to get to the heater core you can make an informed decision on how to proceed. You may decide to simply by pass the heater core, sell the car and get one with working heat, and let the new owner worry about the issue. Mind you, I am NOT advocating deception, please fully disclose the issue to any potential buyer.

just wire up your new ones all together then hook it to the one wire on old horn

Good day and welcome to FixYa! First of, there's nothin to be afraid of. Its an easy thing to do. Just find the screws or it can just be a pull slide up reservoir then install the new one. Nothing serious. Hope this helps and welcome to FixYa!

Sounds like you have a bad ignition immobilizer or maybe the chip in the key is going bad. Did you try using your spare key to the car?

CHECK THE MAF CENSOR VALVE, 5 MINUTE FIX. GET MAF FROM AUTO WRECKERS, 50 BUCKS, NEW 500. GOOD LUCK, IS IT BLOWING BLACK SMOKE WHEN DRIVING UNDER LOAD. GOOD LUCK
JOE

u need a 13 mm wrench to take off the piece of medal that goes over the battery there is 3 bolts , and a 5/16 box wrench to take off the 2 battery cables

You will find wiring diagrams in both Haynes and Chilton books available in auto parts stores and maybe your local library.

just screw it back in try to hold outside ring once it starts continue to tighten

I know caddys and most Eldorado yes they do have oil in crank case

will be either a loose wire connection around the light cluster or the switck has gone , test for power to the light fitting if no power and the wiring is in good condition then i would say try a new switch

Bad injector or injectors not getting proper lower..noir lights help for this