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Juan Crespo
Juan Crespo, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 1513
Experience:  A.S.E. Master Technician, Advanced Level, Emissions - Asian, Domestic, & European
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Have air but no heat what are possible fixes

Customer Question

Have air but no heat what are possible fixes
Submitted: 10 months ago.
Category: Cadillac
Expert:  Juan Crespo replied 10 months ago.

Hi there. Welcome to our site!

PLEASE READ THIS FIRST:

If you’re thinking on working on the vehicle yourself, all my knowledge and resources won’t help unless you…

… have basic mechanical knowledge and skills, and…

… have whatever tools and equipment might be needed for a proper diagnosis

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There are many things that can cause you to have air but no heat in your Cadillac from faulty controls (both mechanical and electrical) to lack of coolant flow through the heater core, to faulty air distribution components and more. The good thing about your car is that the HVAC system has self-diagnostic capabilities which might give us an idea of what is not working as it should. Once we have a starting point, we can then look at possible fixes.

Here is how to enter self-diagnosis using your control panel:

Entering Self-Diagnostics (With Climate Control Center)

Turn ignition switch to ON position. Press OFF button and WARMER button (standard A/C-heater system), or OFF button and PASSENGER
WARMER button (dual zone A/C-heater system). See attached Fig. 1. Press LO fan speed (down arrow) button until "ACM?" is displayed. Press HI fan
speed (up arrow) until "ACM CODES?" is displayed. Press HI fan speed (up arrow) until DTCs are displayed.

NOTE: Self-diagnostics only allows viewing and clearing of DTCs. Testing and overriding A/C system operations
can only be accomplished using a scan tool.

Please let me know what you find and we can continue from there.

Best Regards.

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