The heater is not blowing hot air?

ARKANSASDAVE40

MEMBER
2002 CHEVROLET S-10
4.3L
V6
2WD
AUTOMATIC
225,000 MILES

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.

Monday, December 19th, 2022 AT 12:00 PM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

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.

Images (Click to make bigger)

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Monday, December 19th, 2022 AT 12:42 PM

ARKANSASDAVE40

MEMBER
3 POSTS

Both sides of the heater core are hot. I have disconnected actuator lever to move door manually still no heat.

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Monday, December 19th, 2022 AT 12:58 PM

ARKANSASDAVE40

MEMBER
3 POSTS

That is what has me stumped regardless of which vent is blowing should have heat when blend door is shifted.

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Monday, December 19th, 2022 AT 1:08 PM

KEN L

MASTER CERTIFIED MECHANIC
54,137 POSTS

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.

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Tuesday, December 20th, 2022 AT 10:49 AM