Fan will not work in 1998 cadillac deville so no heat
1- check your fuses 2- if your thermostat needs to be replaced it can cause the fan to stop working because engine never gets hot enough to allow fan to come on. 3- your fan blower motor could be defective and needs to be replaced 4- your fan blower resister may need to be replaced. The fan will still work on high in most cars, but not work at all in others 5- if you have automatic temp control, the control panel may need to be replaced. These are expensive, so get a replacement at junk yard.