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Hey I am looking for some info about the heater on a 93 sedan deville 4.9. I have a new radiator, a fail safe theromstat, good flow to the heater core, new water pump. Have Great Air Flow but it only blows cold air. I was told that it may be my damper doors are stuck open. What are damper doors, where are they and what is the function. I am lost and broke at this point. I have replaced everything and everyone seems to be stumped. Thanks for any help
 

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White Diamond '03 DHS (with DTS floor shift)
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86,785 Posts
Did you replace the "T" fitting in the heater hoses?
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,737 Posts
Did you back flush the heater core, many, many threads on this site, try the search function.
 

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2003 deville
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I had an 84 eldo with the same problem. Inside the duct work there were little doors controlled by a vacuum pot that diverted the air either from the heater or the a/c if these mal function that could be the problem
 
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