The heater is not blowing hot air?

2002 CHEVROLET S-10
225,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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ARKANSASDAVE40
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  • 3 POSTS
Runs at normal operating temperature (190). Both sides of the heater core feel the same temperature. I have disconnected the hot/cold actuator on top of HVAC unit and switched to either side manually. Still no heat. All vents blow out regardless of the settings from floor to vent and defrost.
Dec 19, 2022 at 12:00 PM
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STRAILER
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When you say "Both sides of the heater core feel the same temperature" do you mean as hot as the radiator hoses? You may have a heater core that is plugged up or the mode actuator is not working. here is a guide to help us fix it and I have included the mode actuator location so you can check it out:

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

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
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Dec 19, 2022 at 12:42 PM
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ARKANSASDAVE40
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Both sides of the heater core are hot. I have disconnected actuator lever to move door manually still no heat.
Dec 19, 2022 at 12:58 PM
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ARKANSASDAVE40
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That is what has me stumped regardless of which vent is blowing should have heat when blend door is shifted.
Dec 19, 2022 at 1:08 PM
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STRAILER
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Yes, it should you may have a clogged heater core, try to remove the hoses and blow through it with a garden hose to see if that helps. Also, let me know of the condition of the coolant that comes out of the core. You may have a temperature blend door that has broken internally.
Dec 20, 2022 at 10:49 AM