20 Most Recent 1988 Cadillac Seville Questions & Answers

Sounds like you may need a new battery. Weird things happen when a battery is under charged. Wipers turn on real slow, dash lights come on. Time for a new battery, possibly an alternator if it's not keeping the battery properly charged.

Looking for the jet screw/screws or trying to adjust?

around 220 is about the high end of normal operating temperature,watch it carefully and if it gets ANY hotter than that then drive it right away to a highway or get it up to at least 40 mph and it will cool down to approx.150 degrees,Make sure there is enough antifreeze in it first.Also listen for the cooling fan to come on when it gets to 200-210 degrees,you may need a new cooling fan motor which is about $60.00 plus labor

Im 85% sure if you pull the heater hoses off where they connect to the engine, you will find that they are clogged with grime and corrosion.

Typically the the low pressure/suction line is a bigger pipe/tube, as far as location it depends on the car. The bigger AC line is almost 99 percent of the low pressure. Usually on the cap it will say most of the times to there is a different hydraulic fitting for the low and high side. Most cars I have seen have a little tag that will say suction or low pressure line, and or discharge high pressure. If you are re charging the gas, always use the low pressure side of the system. I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_54ae41aaaffbab00

under dash on the passenger side of vehicle. Depending on your dash type you will probably have to remove the whole dash to access it.

It is vacuum operated. It may currently be disconnected from the carburetor'throttle body linkage. On the off chance it is connected, it likely has a hole in the diaphragm. So it may be disconnected at the vacuum line to the intake manifold.There is also a vacuum dump switch which might be stuck open, damaged, or just out of adjustment which is normally pinched off until the brakes are applied and the switch is supposed to dump within the first inch of travel of the pedal. This is a mechanical override of the cruies control, and the brake light energy is supposed to release the control when the brake lights are energized.There is also a magnet and sensor down either on the transmission speedometer gear housing,where it enters the transmission or on the driveshaft. If the magenr is not there, there is no speed pulse reference for the control to operate from. So it has no reference it can maintain. It is not a sophisticated system, and it is prone to leaks after 23/24 years.You can hear the dump valve if it is open, you can hear and see the diaphragm on the cruise control to see or hear if it is damaged when the hood is open. With the right meter, you can ascertain if the magnet is still present in the spot it is supposed to be once you locate the connector for the sensor- it is a hall effect switch usually.You already know the electrical portion of the system works, so the problem is largely isolated to a vacuum leak or a sensor of unit is still connected. Normally the vacuum unit sits on the inner fender on either side.and the control cable arcs over to the transmission linkage side of the carburator or throttle body, it has one wiring harness connector and one vacuum connection and the cable to the carb, and usually only 2 bolts holding it down. A wrecking yard might be a source for a good unit used, New old stock may still be in the system although likely aftermarket with the nationalization of GM.

Th engine have oil all around. Its dificult to tell whit out see it. But wash th engine in a car was. Then let it dry, start th car and u will see where is this leak starting from

The digital dash in this model is really a computer display, these are full of logic chips and hundreds of other parts, they do fail and then the cluster blanks out, it is fairly common on this model. You will need to pull the clutter out of the car and send it in to one of the many GM licensed repair facilities that rebuild these dash clusters. The one I use is called "Speedotach" they are a nation wide firm.

and any hoses that are attached to it,, and or sensors

Bad engine or tranny mount, exhaust etc.

Go to the local parts store and some one in there will help you find it if there is one.

have the coolant system flushed out, you might have a clogged heater core