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When I turn on the heater or the defroster in my vehicle, the air conditioning compressor comes on intermittently?

Tiny
PITBULLYGIRL
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
When I am looking at the engine under the hood, I can see it come on. Then it shuts off and it does this approximately every 5 minutes or so. It doesn't stay on. I have had this happen on several Chevrolet cars that I have owned in the past. I am wondering why this is happening.
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Saturday, January 6th, 2024 AT 10:42 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

The A/C compressor is designed to cycle with the defroster on. It is used to help dehumidify the air entering the vehicle. That way, it defrosts the glass faster.

Based on your description, it sounds like it is working as designed.

Let me know if this helps or if you have other questions.

Take care,

Joe
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Sunday, January 7th, 2024 AT 12:12 AM
Tiny
PITBULLYGIRL
  • MEMBER
  • 21 POSTS
Thank you for your response. I appreciate it.
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Monday, January 8th, 2024 AT 7:37 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

You are very welcome. Feel free to come back anytime in the future if you have questions or need help with a problem.

Take care of yourself,

Joe
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Monday, January 8th, 2024 AT 6:24 PM

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