While driving the AC fuel gages speedometer radio etc suddenly stopped working without warning Is this a fuse module Please help as car is owned by your 82 year old mother 1990 cadillac deville?

It's highly likely the problem is a blown fuse, a faulty fuse block, or a problem with the Instrument Panel Cluster (IPC) itself. The sudden failure of multiple electrical systems (AC, fuel gauge, speedometer, radio) strongly suggests a common power source issue rather than individual component failures.

Here's what you should do, in order:

1. Check the Fuses: Your 1990 Cadillac DeVille has several fuse boxes. Locate the owner's manual (or find a downloadable version online) to identify their locations and the amperage of the fuses. Check *all* fuses carefully, not just the ones obviously related to the failed systems. A blown fuse might be related to something else entirely, causing a cascade failure. Replace any blown fuses with fuses of the *exact same amperage*. Never use a higher amperage fuse as this is a fire hazard.

2. Check the Fuse Blocks: The fuse blocks themselves can sometimes fail, even if the fuses look okay. Visually inspect the fuse blocks for any signs of damage, corrosion, or loose connections.

3. Instrument Panel Cluster (IPC): If the fuses and fuse blocks are fine, the problem might be with the IPC itself. This is the unit that houses the gauges and displays. The IPC receives power and signals from various parts of the car; a fault within it could explain the widespread failure. Repairing or replacing an IPC is generally more complex and expensive.

4. Battery and Connections: A weak battery or corroded battery terminals could also cause intermittent or widespread electrical problems. Check the battery terminals for corrosion and clean them if necessary. Test the battery's voltage to ensure it's within the normal range.

Important Considerations for your 82-year-old Mother:

* Safety: Do not attempt any repairs yourself unless you are experienced with automotive electrical systems. Working with car electrical systems can be dangerous.

* Professional Help: Given your mother's age and the complexity of the problem, it's strongly recommended to call a qualified mechanic or roadside assistance. They have the tools and expertise to diagnose and repair the issue safely and efficiently.

* Towing: If the car is undriveable, arranging for a tow truck is the safest option.

Don't delay getting this looked at. A car with multiple electrical failures can be dangerous, and you want to ensure your mother's safety.