Heater puts out warm air no hot air?

Tiny
RREAPER
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 2.6L
  • V6
  • 4WD
  • AUTOMATIC
  • 87,000 MILES
Heater puts out warm air no hot air, with heater on warm air cold air 2 defroster vents do switch I I can switch climate control switch a little bit of change in warm air not very much. Heater hoses get hot in out heater core hoses get hot?
Saturday, August 24th, 2024 AT 7:42 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
This can be one of two things either the heater core is partially clogged, which you can flush out using a garden hose, or the temperature blend door actuator is not closing all the way. Please go over this guide to help as well:

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

Here is the location of the temperature blend door actuator so you can remove it and work the blend door pivot by hand to see if it makes a difference, (HVAC system on) van engine warm.
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Saturday, August 24th, 2024 AT 11:59 AM
Tiny
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Thank you, a place, to start. I will reply when I check things out.
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Sunday, August 25th, 2024 AT 9:02 AM
Tiny
KEN L
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Sounds good, let me know what happens please.
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Sunday, August 25th, 2024 AT 9:37 AM
Tiny
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Took motor cover off actuator works turns c-wise and cc-wise flushed heater core little debris came out flushed until clear water, refilled core with anti-freeze got a lot more heat? Can a little debris make that much difference?
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Thursday, August 29th, 2024 AT 4:43 AM
Tiny
KEN L
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Oh yes, you would not think it would, but a clogged heater core is a common problem. I would flush the core in both directions for optimal performance.
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Thursday, August 29th, 2024 AT 10:08 AM

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