Heat/AC

200,000 MILES • 5.3L • 2WD • AUTOMATIC
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TERREWRIGHT
  • MEMBER
  • 3 POSTS
When the heat is on it blows cold, when the AC is on during the summer it blows hot. What could this be? What part will i need to replace?
Feb 12, 2018 at 1:21 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good afternoon.

When you command hot and cold and back again, can you hear the mode door in the dash moving back and forth?

When you turn on the AC, does the compressor come on?

lets start with basics.

Roy
Feb 12, 2018 at 5:16 AM
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TERREWRIGHT
  • MEMBER
  • 3 POSTS
Yes i can hear it moving back and forth. I am not sure how to tell if the compressor is coming on.
Feb 12, 2018 at 5:59 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Look at the front of the compressor. when the AC is activated, it will be turning. that is called the clutch.

Roy
Feb 12, 2018 at 6:01 AM
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TERREWRIGHT
  • MEMBER
  • 3 POSTS
Okay.
Feb 12, 2018 at 6:06 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Let me know.

Once we know that then we can continue as to possible issues.

Roy
Feb 12, 2018 at 6:09 AM
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