Heater blows cold

2004 CADILLAC DEVILLE DTS

141,000 MILES • 4.9L • V8 • 2WD • AUTOMATIC

OUT COLD

MEMBER
3 POSTS

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 7:20 AM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

Good morning

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

Roy

Dec 30, 2017 at 10:51 PM

OUT COLD

MEMBER
3 POSTS

It has DTS on trunk lid, & here's the VIN#

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Dec 30, 2017 at 11:03 PM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

Is this a seville or deville??

Dec 30, 2017 at 11:07 PM

OUT COLD

MEMBER
3 POSTS

DeVille

Dec 30, 2017 at 11:27 PM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

Ok thanks

Pictures attached. you are right there

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Dec 30, 2017 at 11:32 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.