Heater blows cold

2004 CADILLAC DEVILLE DTS
141,000 MILES • 4.9L • V8 • 2WD • AUTOMATIC
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OUT COLD
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Heater blows cold, AC blows colder. Temperature set at ninety. Changed thermostat and outside temperature senor. Right now Ia m in the middle of trying to change heater core. Having problems getting to it. Everything off the front except what I think is the air blender. It is in the center behind controls. Any help, I am over my head. Maybe advise on manuals or videos.
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Dec 29, 2017 at 3:20 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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ASEMASTER6371
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Good morning

Can you verify it is a DTS?? I only see CTS??

Roy
Dec 31, 2017 at 6:51 AM
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OUT COLD
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It has DTS on trunk lid, & here's the VIN#
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Dec 31, 2017 at 7:03 AM
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ASEMASTER6371
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Is this a seville or deville??
Dec 31, 2017 at 7:07 AM
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OUT COLD
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DeVille
Dec 31, 2017 at 7:27 AM
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ASEMASTER6371
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Ok thanks

Pictures attached. you are right there
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Dec 31, 2017 at 7:32 AM