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.

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,904 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.

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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
42,904 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