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Heat takes long to warm up. Heat fades during driving. Heat never gets warm enough even when set to 90. The defrost doesn't seem to work at all. Inlet and outlet of heater core warm on both ends. Please help or give advice.

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You most likely have a HVAC door that is not operating properly for whatever reason.

If that is the case, you will have one or more trouble codes set and the codes are what you need to start your diagnosis. Here's how to display your codes (for HVAC pay attention to "B" codes)....

http://www.caddyinfo.com/readingcodes.html

Before you start into pullling dash panels and trim panels to replace parts, my Seville loses control of the temperature periodocally and has been acting like that for several years. I can explain my "fix" if you think it will get you through the balance of the winter weather.

Jim

Drive your car.

Use your cell phone.

CHOOSE ONE !

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I have a B1340 code. I think it is air door mix one movement code. Whats next?

Replace the actuator, the same thing happened to me a couple of years ago, but my Deville is different than your Seville. You will need to observe the actuator to see which one is not moving, or get someone with a 99 FSM to tell you the location of the actuator that sets a B1340 code in your year

Once I replaced my actuator, the problem was gone, it caused me to get heat instead of AC

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I have a B1340 code. I think it is air door mix one movement code. Whats next?

Replace the actuator, the same thing happened to me a couple of years ago, but my Deville is different than your Seville. You will need to observe the actuator to see which one is not moving, or get someone with a 99 FSM to tell you the location of the actuator that sets a B1340 code in your year

Once I replaced my actuator, the problem was gone, it caused me to get heat instead of AC

My 96 Deville has the same problem minus the trouble code. It takes forever to get warm even though the engine usually runs at 200*. The most time i feel any heat is on the highway on a trip. I havent figured out if it is the heatercore or some other problem.

This car has the worst heat i have ever seen. I also cant stand the fact that there is no option to make heat come out of the dash vents, truly retarded if you want my opinion, So basically everywhere I go my fingers are frozen and my toes are cold

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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