Heater blowing cold air?

1999 CADILLAC DEVILLE
152,000 MILES
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TRUBREW1991
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Okay, when i first bought my car, it was working great. It gets really hot really quick. Yesterday my cat started over heating and i put coolant in it have now it's blowing out rant cold air.
Dec 20, 2022 at 6:55 AM
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STRAILER
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I would start the engine and allow it to heat up, then grasp the heater hoses to see if they are hot, this way we can see if it is a cooling system problem or an HVAC issue. Double check the engine coolant level before you begin.

Please check out this guide which can help as well:

https://www.2carpros.com/articles/car-heater-not-working

Please go over this guide and report back.
Dec 20, 2022 at 10:35 AM