Heater only blows cool air out of heater

This is from Lifewire: If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Another common problem is when air gets into the cooling system. Since the heater core is often the high point in a cooling system, air can move into it and become trapped.

Try this site too: https://axleaddict.com/auto-repair/Why-Are-My-Car-Heaters-Blowing-Out-Cold-Air

heater blows cold air idle chrysler 300 Questions & Answers ...

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Find solutions to your heater blows cold air idle chrysler 300 question. ... blow warmair for a few mins then back to luke warm. i replaced thermostat ... HEAT BLOWSCOLD AIR WHEN IDLING ONLY GETS HOT WHEN START DRIVING ... About 15 minutes after driving the diver side vents start blowing straight cold air but the ...

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Why is My Car AC Blowing Hot Air? - BlueDevil Products

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Is the cooling system full of liquid coolant and does not have any air pockets ?

Try flushing the cooling system. The heater core us probably clogged. A flush may clean it out. Good luck.

auto ac? check for a coolant leak low collant level will cause air pockets in cooling/heater system.

Sounds like your heater core needs to be replaced.

try flushing the cooling system. sounds like the heater core may be all gumed up inside. could also be the water pump starting to fail.

my 2000 saturn sl blows cold air with the heater on. I changed the thermostat,and checked out my heater core.Still blows cold air.

You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

Have the cooling system flushed or remove the hoses from the firewall(when cool) and blow out heater core with compressed air-clogged heater core..