Try replacing the motor to the a/c fan on the passenger side of the vehicle. That was the cause for my 98 deville to overheat. They sell the whole assembly for about $150.00 but they also sell the motor separate for $50.00. Its a lil more work but it'll save you $100.00
Heater coil
My 01 deville had a cracked intake boot, between the throttle body and intake manifold, it would only leak when eng was hot.
because ur heads need inserts..2500 dollar job
Coolant temp is about 196F. Mine runs cool on a highway, 2 notches below the red line on hot days in traffic.
my 1997 cadillac deville also runs at 205-220 and it hasn't overheated yet,but you should also know that the cooling fans don't even kick on until the engine temp reaches 222 degrees>>just to let you know. I'm not sure but mine runs between 206 and 219 and seems to be okay with it.
Heater core has failed.
not for sure, but sound like something messed up in the dual climate control chip.
usually running hot coincides with a lack of coolant. Low coolant levels will eliminate circulation of coolant through heater core. ALMOST END RESULT----NO HEAT
It could be low coolant, a defective cooling system or it may have a blown head gasket
Use Dexron III in your 94 transaxel. Check level while hot. Drive about 5 miles minimum. Remember too much fluid can damage it also.
There are a number of music stores where you can purchase a Fender Hot Rod DeVille guitar amplifier including Sam Ash, Musician's Friend, Guitar Center and Sweetwater.
it might be your fuse. Does your seat warmer work?