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With that year deville...its more than likely the blower motor
Heater coil
might need to replace blower motor
e.g. heater core clogged is a common one - flush or replace it
It appears your blower motor is not working correctly on your 1980 Cadillac Coupe Deville. The vents are for both AC and heat. You may also be losing vacuum pressure. If you cannot find the source, your mechanic can help you do so.
The water pump is on the front of the engine. If the pump goes bad, the engine can over heat causing severe damage.
i have the same problem with my 91 deville need answer please thank you in advance
passenger side temp acuator has gone bad
We just bought a 1999 Deville, so I can't help with other years. The system is the best! You don't choose heat or cool. After you choose auto or on, you raise or lower the temp. If you turn the temp lower than the outside temp, the air conditioner will cool and if you turn the temp up higher than the outside temp, the heat will come on. I love it! No more cold air blowing on me to cool down. It is true "climate control" with sensors doing all the work!
Rent or aquire a temperature gun and make sure the heat off the radiator is within 15 degrees of the operating temp.
This is actually common for most cars. The reason is that the heater pulls heat away from the engine into the car itself.
You might also notice that the passenger side air is slightly warmer than the drivers side. Try to flush the heater core, it might be clogged.